bluuebunny/crossref_metadata_2025 huggingface dataset:
RENORMALIZATION GROUP EQUATION AND EFFECTIVE ACTION IN STRING THEORY
Authors: GAITE J.
Published: November 2004

The connection between the renormalization group for the σ-model effective action for the Polyakov string and the S-matrix generating functional for dual amplitudes is studied. A more general approach to the renormalization group equation for string theory is proposed.
MASSIVE VECTOR BOSONS: BRST QUANTIZATION AND FIRST ORDER FORMALISM
Authors: MASPERI LUIS , MONTEMAYOR RAFAEL
Published: November 2004

We present the BRST quantization of massive vector bosons. From the original constrained theory with its second class algebra, we construct equivalent gauge theories in adequately enlarged phase spaces, using both Lagrange multipliers and the Stückelberg approach. These new theories are developed in the context of first order formalism showing that the resultant sets of BRST invariant states are equivalent to the physical states of the original theory.
VORTICES IN HIGH-TEMPERATURE STRING THEORY
Authors: CHAPLINE G. , KLINKHAMER F.R.
Published: November 2004

We discuss the role of XY-like vortices on the world-sheet for the free energy of strings at high temperatures. There is a Kosterlitz-Thouless phase transition at the Hagedorn temperature, above which the vortices contribute to the free energy in genus zero and generate a mass gap. We speculate that high-temperature “string” theory could be essentially discrete.
STRANGELET SEEDING FROM STELLAR EVOLUTION: A CHAIN WITHOUT END?
Authors: BENVENUTO O.G. , HORVATH J.E.
Published: November 2004

We present a scenario for strangelets seeding in galactic environments based on the ejection of strange matter from type II supernova events. The possibility that these aggregates act in turn as triggers of future explosions of the same type is discussed, together with the expected features of their distribution and abundance.
SCALAR FIELD THEORY ON A KÄHLER MANIFOLD
Authors: COSTA K.M.
Published: November 2004

The invariant one-loop counter terms for a class of non-polynomial complex scalar field theories are found using the background field geodesic expansion together with heat kernel methods. These theories have dynamics invariant under a group G with fields that transform linearly only under a subgroup H of G. The fields are coordinates on a complex Kählerian manifold corresponding to the coset space G/H. The technique is applied to the CP n model.
COLD FUSION IN CONDENSED MATTER: IS A THEORETICAL DESCRIPTION IN TERMS OF USUAL SOLID STATE PHYSICS POSSIBLE?
Authors: SCHOMMERS W. , POLITIS C.
Published: November 2004

A model for cold fusion in condensed matter is proposed (cold fusion of deuterons in palladium). It is assumed that the palladium-deuterium system forms an alloy, i.e., it is assumed that Pd ions as well as d+ ions are embedded in an uniform background of negative charge (conduction electrons). The model is based on an interaction potential for deuterons in solid palladium which has been estimated by means of a theoretical picture well known in the physics of liquids. On the basis of this potential the essential experimental results of Fleischmann and Pons, and Jones et al. can be explained qualitatively. In particular, the following effects are possible:

1. Cold fusion in condensed matter can take place.

2. The observed energy should be larger than that given by the fusion reactions.

3. Hitherto unknown nuclear processes must not be postulated as reported by Fleischmann and Pons.

4. The deuterons are mobile.

5. The deuterons can form close-packed clusters, and in principle a fusion reaction can take place within such a cluster.

6. Not only 3He should be produced in Pd but possibly 4He too.

From our theoretical picture, it can be concluded that experimental results will be strongly dependent on the condition of the materials used in the experiments. This can possibly explain that only a part of experiments could show up cold fusion. A well defined condition (lattice defects, different phases, impurities, etc.) of the materials is probably the most critical point in connection with the observation of cold fusion in condensed matter. The effect should also be influenced by lattice dilatations. Experiments with other materials instead of palladium (e.g. vanadium, titanium, lanthanide metals, and different alloys) should be probably more informative.
ON FLIPPED SO(10)
Authors: HE X.G. , MELJANAC S.
Published: November 2004

The degenerate minima in a recently proposed N=1 supersymmetric SO(10) GUT model are investigated. It is found that the natural missing-partner mechanism and a flipped SU (5)×U(1) phase cannot be simultaneously implemented in the SO(10) model. The splitting of supersymmetry degeneracy is analyzed. It is shown that the SU (3)C × SU (2)L × SU (2)R × U(1) B−L × D symmetry is favored as an intermediate phase in a restricted region of parameter space.
QUANTUM CONSISTENCY OF A GAUGE-INVARIANT THEORY OF A MASSIVE SPIN-3/2 PARTICLE INTERACTING WITH EXTERNAL FIELDS
Authors: RINDANI SAURABH D.
Published: November 2004

A gauge-invariant theory of a massive spin-3/2 particle interacting with external electromagnetic and gravitational fields, obtained earlier by Kaluza-Klein reduction of a massless Rarita-Schwinger theory, is quantized using Dirac’s procedure. The field anticommutators are found to be positive definite. The theory, which was earlier shown to be free from the classical Velo-Zwanziger problem of noncausal propagation modes, is thus also free from the problem of negative-norm states, a longstanding problem associated with massive spin-3/2 theories with external interaction.
CLASSICAL SOLUTIONS OF THE p-BRANES
Authors: STOYANOV D.T.
Published: November 2004

An appropriate subsidiary condition is introduced in the classical actions of the p-branes (p arbitrary). A general class of exact solutions of the resulting nonlinear equations of motion are obtained which yield a broad class of characteristics for the original covariant equations of the p-branes.
THE EFFECTS OF NUCLEON QUARK SUBSTRUCTURE ON THE 3He-3H ELECTROMAGNETIC MASS DIFFERENCE
Authors: MALTMAN KIM
Published: November 2004

It is argued that the neglect of intrinsic quark motions within the nucleon implicit in traditional nuclear estimates of magnetic contributions to the A=3 binding energy difference produces an underestimate of the size of these contributions. A schematic non-relativistic quark model calculation demonstrates that the magnitude of the discrepancy is unlikely to be neglible, and that the sign of the effect is such as to require an increase in charge symmetry breaking from other sources.
BRST QUANTIZATION OF TWISTED KAĈ-MOODY ALGEBRAS
Authors: LEVI A.R.
Published: November 2004

We consider the BRST quantization of the semidirect sum of twisted Kaĉ-Moody algebras with the Virasoro algebra.
NEW DOMAINS FOR ALLOWED UNHINDERED BETA DECAYS OF EVEN-MASS DEFORMED NUCLEI
Authors: SOOD P.C. , SHELINE R.K.
Published: November 2004

The allowed unhindered spin-flip beta decays of even-mass deformed nuclei are shown to include the [532] and [505] Nilsson orbitals transformations in addition to those involving [523] and [514] orbitals in evidence for the odd-mass nuclei. New features in even-mass decays arising from transformations involving the coupled nucleons, multiple isomers in the odd-odd nuclei, and pairing correlation effects in the even-even nuclei are discussed. An extension of the K-selection rule for even mass decays is presented.
SELF-INTERACTION ANISOTROPY OF STIEFEL SYSTEMS OF GOLDSTONIONS
Authors: GAVRILIK A.M.
Published: November 2004

The inadequacy of a single-charge isotropic description of the renormalization group (RG) behavior is demonstrated for 2-dimensional nonlinear sigma-models on real Stiefel manifolds. The RG equations governing the evolution of the homothety charge t and the anisotropy magnitude η are obtained and an explicit formula for the RG trajectories in the η, t plane is derived. The existence of asymptotic freedom (AF) and its intensity are shown to depend on the value of η.
THE STRING TENSION AND SMEARED POLYAKOV LINES IN PURE QCD ON 324 LATTICES
Authors: FORD I.J.
Published: November 2004

A method is described which allows an evaluation of the string tension in pure QCD via the correlation of smeared Polyakov lines on Euclidean lattices of size 324 points at values of the coupling β equal to 6.585 and 6.88. The calculation is made possible by the three dimensional extension of these operators which improves the overlap upon the colour fluxloop state propagating on the lattice. Results are obtained which do not exhibit asymptotic scaling, but which are consistent with a previous determination of the string tension on the same lattices using the alternative method of smeared Wilson loops.
RESONANCE PRODUCTION IN A STRONGLY INTERACTING HIGGS SECTOR
Authors: ROSENFELD ROGERIO
Published: November 2004

We compute the cross section for the production of resonances in the strongly interacting Higgs sector analogous to the f2 and a1 resonances in QCD via gauge boson fusion processes in pp colliders at [Formula: see text] and 40 TeV. Their contribution to signatures of this scenario is briefly discussed.
GAUGE TWO-FORM IN D=4, N=4 SUPERGEOMETRY WITH SU(4) SUPERSYMMETRY
Authors: GATES S. JAMES , DURACHTA J.W.
Published: November 2004

We employ a gauge two-form [Formula: see text] in place of the pseudoscalar B' to produce a version of on-shell D=4, N=4 superspace supergravity with SU(4) symmetry. The replacement is accomplished using the Chern-Simons forms associated with the six spin-1 fields of N=4 supergravity. Finally, a Green-Schwarz action is presented and the relation of the theory to the N=4, D=4 heterotic string is exhibited.
A SIMPLE REFORMULATION OF THE EFFECTIVE YUKAWA NUCLEON-NUCLEON INTERACTION
Authors: IWE H.
Published: November 2004

It is seen that the effective Yukawa nucleon-nucleon interaction can be rewritten into a sum of a Gaussian function and a Delta function facilitating especially analytical calculations. This reformulation turns out to be an excellent approximation.
U(1)’s AND NON-PERTURBATIVE UNIFICATION
Authors: LEONTARIS G.K. , TRACAS N.D. , VAYONAKIS C.E.
Published: November 2004

Motivated by the plethora of models, mainly remanant from superstring theories, in which several U(1) factors are present, we consider constraints on these theories from the requirement that non-perturbative, as opposed to perturbative, unification arises close to the Planck scale. We find that non-perturbative unification can be realized with three standard families up to a supersymmetry breaking scale of order 100–500 TeV and six supersymmetric families above that scale.
MASSIVE SPINNING SUPERPARTICLE
Authors: KOWALSKI-GLIKMAN J. , LUKIERSKI J.
Published: November 2004

We consider new supersymmetric particle model, describing the massive extension of D=4 spinning superparticle model, derived in Ref. 1. It is shown that our model can be described by the D=5 massless spinning superparticle model after dimensional reduction D=5→D=4 and putting the fifth momentum P5=m. The known massive superparticle and massive spinning particle models can be obtained as special cases. The first quantization of the massive spinning superparticle model gives a N=2 massive vector multiplet (one complex scalar, two Dirac spinors, one massive complex vector field).
MINIJETS, UNITARITY AND MULTIPLE PARTON SCATTERING
Authors: BROWN N.
Published: November 2004

Multiple scattering of partons is an important prediction of the parton model in high energy [Formula: see text] collisions, which can have a dramatic effect on the calculation of inclusive jet cross-sections at low transverse momenta. We discuss the implications of multiple scattering using a probability model, where it is found that at high energies the effects are extremely important in semi-hard processes, as well as being extremely sensitive to the shape of the gluon distribution within a proton. We give some examples at SSC energies.
SIMPLE APPROXIMATION FOR QED O(α) CORRECTED FORWARD BACKWARD ASYMMETRY
Authors: RIEMANN TORD , WAS ZBIGNIEW
Published: November 2004

It is shown that the simple semi-analytical formula which involves a convolution of the Born asymmetry with the photon spectrum agrees to a precision better than LEP’s experimental error with exact O(α) result for the forward-backward asymmetry. The exact O(α) result differs from the convolution by 0.5×10−3 at the Z peak and by less than 3 ×10−3 close to Z peak. The result was obtained without kinematical cut-offs.
SOLITONS AND LORENTZ COVARIANCE AT A QUANTUM LEVEL
Authors: YANG XIN-HUA , PARMENTOLA JOHN A.
Published: November 2004

An explicit form for the boost operator is derived based upon the Christ-Lee formulation of soliton quantization and we argue that the boost operator along with the other Lorentz generators satisfies the Lorentz group algebra perturbatively in a dimensionless parameter.
HAMILTONIAN FORMULATION OF CHIRAL SCHWINGER MODEL IN FOUR DIMENSIONS
Authors: KIM W.T. , CHO B.H. , PARK D.K.
Published: November 2004

The four dimensional chiral Schwinger model can be quantized through the generalized point splitting method in Schrödinger representation. It satisfies the consistency and unitarity in the physical subspace.
B MESON FACTORIES
Authors: CLINE DAVID B.
Published: November 2004

Particle physics makes progress in three Frontiers: (1) High Energy Frontier, (2) High Intensity Frontier, and (3) High Precision Frontier. Category (1) will be dominated by the SSC and LHC experiments in the next decade and (3) by precise measurements of the (g−2)μ and sin2θw. In category (2) there will be a new round of intense “factories” constructed for rare K decays, [τ charm] studies, ϕ Factories and B Factories. Each of these Factories provide new physics possibilities as illustrated in Table 1. Note that the High Intensity Frontier is sometimes the same as the High Precision Frontier since high statistics are usually needed for high precision. In this brief note we describe some of the current possibilities for B Meson Factories.
HIGHER-SPIN SYMMETRY IN ONE AND TWO DIMENSIONS (I)
Authors: FRADKIN E.S. , LINETSKY V. Ya.
Published: November 2004

Higher spin theories in one and two dimensions are considered. The analysis of the ghost sector is carried out and a possible analogy with the ghost sector of the superparticle and the Green-Schwarz superstring in the covariant gauge is discussed.
HYPERFINE INTERACTIONS IN HEAVY QUARKONIA AND DECAY WIDTHS OF ηb STATES
Authors: GHOSH S. , MUKHERJEE S.
Published: November 2004

It is noted that the fine hyperfine splittings in heavy quarkonia cannot be explained satisfactory by considering the usual Breit-Fermi type of interactions. Exact results or bounds will, therefore, be very useful in this context. Using Martin’s techniques, some weak inequalities for the values of the wave function at the origin for the triplet and singlet S-states have been derived for a large class of QǬ potentials, including the recently proposed Gupta’s potential. The inequalities could be used to predict bounds for the decay widths of the ηb states.
DIRAC-BORN-INFELD ACTION FROM DIRICHLET σ-MODEL
Authors: LEIGH R.G.
Published: November 2004

In a recent paper we discussed, among other things, the effect of duality transformations on the open bosonic string theory. Namely, we conjectured that a macroscopic object, the D-brane, effectively interacts with closed and open string modes in the low energy limit. This conjecture was supported by a string scattering amplitude calculation. In this letter we report on a σ-model calculation in the mixed Dirichlet-Neumann theory. We find an action of the Dirac-Born-Infeld type restricted to (26−k)-dimensions.
INDUCED PRODUCTION OF BOSONS AND ITS APPLICATION TO CENTAURO EVENTS
Authors: LAM C.S. , LO S.Y.
Published: November 2004

We derive formulas describing the induced production of bosons via fireball emissions. If the fireball volume is large, induced emission is unimportant and we get back to the usual independent emission model. Induced emission due to the Bose-Einstein statistical nature of bosons is however very important for small fireballs, from which we obtain greatly enhanced production rates and very unusual charge distributions. This can explain the cosmic ray Centauro events if the fireball has an energy density of the order of 1 TeV/(fm) 3. We suggest that this density may be feasible if preons do exist.
IRREVERSIBILITY OF THE COSMOLOGICAL EXPANSION
Authors: MARX GEORGE , SATO HUMITAKA
Published: November 2004

The spectrum and isotropy of the relic microwave radiation indicates that the universe was in a state of thermal equilibrium in the past. The question arises: how could it happen that a closed system dropped out of its equilibrium? According to the models presented here this was the outcome of an interplay between the mechanical instability in the gravitational equations and the different scaling behaviors of differentiated materials.
QUARK MASS EFFECTS IN $\psi\to B\bar B$ DECAYS
Authors: CARIMALO C.
Published: November 2004

It is emphasized that since intermediate distances, in a range lying between confinement and asymptotic freedom, are probed in ψ decays, the quarks that constitute the hadrons produced in these decays should be considered as "constituent quarks" rather than "current quarks", as chiral-symmetry breaking effects should probably be already efficient in that range. In the case of ψ decays into baryon-antibaryon pairs, it is shown that the resulting quark mass effects may be important, especially when studying the angular distributions of the baryons emitted. Agreement with experimental data is found for these distributions, using a very simple nonrelativistic static quark model where each constituent quark in a baryon is assumed to have an effective mass of about a third of the baryon mass.
SIMPLE REACTION STRUCTURES IN A "COMPLICATED" KINEMATIC RANGE
Authors: ARASH FIROOZ , MORAVCSIK MICHEAL J. , GOLDSTEIN GARY R.
Published: November 2004

The energy range between 500 and 1000 MeV is usually considered a "complicated" one for elastic proton-proton scattering in which there is no simple description. It is shown that in that energy range, for much of the angular range, two simple features of the magnitudes and relative phases of the invariant amplitudes in the planar transverse frame give a good approximation of the observed data on unpolarized cross section as well as all the various polarization measurements. The features appear to be particularly pronounced at the larger scattering angles and higher energies, thus suggesting a connection with the small distance part of the internucleon force which thus may shed light on the validity of various quark models. Similar regularities also appear in a similar energy and angular range for pion-nucleon scattering. A simple way is presented on a quark level to summarize these regularities.
ELMUD: an ELectron MUon Detector for Higgs physics at the SSC
Authors: Paige Frank E.
Published: November 2004

Requirements for detecting H→Z0Z0→ℓ+ℓ−ℓ+ℓ− at the SSC with mH=800 GeV are explored. It is found a luminosity of 1034 cm −2 sec −1 is needed but that the detector can have only a fast electromagnetic calorimeter plus a muon detector. Such a detector should be feasible at the required luminosity.
ASSOCIATED PRODUCTION OF WEAK BOSONS AND HEAVY QUARKS WITH HADRON COLLIDERS
Authors: Halzen F. , Kim C.S.
Published: November 2004

We calculate the joint production of W± and top quarks via the leading order diagrams [Formula: see text] and bg→Wt. Although the latter contribution is O(αs) we find it to be sizeable and to subtract from the leading order [Formula: see text]. The calculations are of interest as they represent the dominant background in the search of charged Higgs particles [Formula: see text] in the minimal SUSY model. With this in mind we also present results for the pT distribution of the top and the dilepton invariant mass resulting from leptonic decay of both particles in the Wt final state.
THE γγ SIGNAL OF PSEUDOSCALAR t′-QUARKONIUM AT THE SSC
Authors: Glover E.W.N.
Published: November 2004

Decays of fourth generation t′-quarkonium states are examined. Although b′-quarkonium decays are hard to see, the ηt′→γγ decay is enhanced by a factor of 16 relative to the ηb′→γγ decay. Provided the fourth generation quark mass splitting is small, O(few GeV), the decay ηt′→γγ leads to a rate of two photon events that is observable above the continuum [Formula: see text] background in high luminosity pp collisions at [Formula: see text] for Mt′<O(250 GeV ).
SIGNATURES FOR HORIZONTAL SYMMETRIES AND SOME OTHER EXOTICA AT HADRON COLLIDERS
Authors: Pakvasa Sandip
Published: November 2004

A brief overview of signatures at hadron colliders to be expected from horizontal symmetries, gauge as well as global, is given. Several other exotic possibilities and their possible signatures at hadron colliders are also considered. In particular; leptoquarks, stable leptons or quarks with funny charges, color excitation with integer charged unconfined quarks are discussed.
A UNIFIED PHYSICAL PICTURE OF MULTIPARTICLE EMISSION: WIDE MULTIPLICITY DISTRIBUTION FOR $\bar{p}p$ AND NARROW MULTIPLICITY DISTRIBUTION FOR e+e− COLLISIONS
Authors: CHOU T.T. , YANG CHEN NING
Published: November 2004

A unified physical picture for multiparticle emission in hadron-hadron and e+e− collisions is presented. It is based on the wide range of values of the total angular momentum in hadron-hadron collisions. Experimental support is reviewed. An extension of the considerations to give a theory of the momentum distribution of the outgoing particles is compared with experiments.
RADIATIVE CORRECTIONS TO THE S-WAVE DIRAC EQUATION NEAR A MONOPOLE AND MONOPOLE CATALYSIS OF PROTON DECAY
Authors: SEREBRYAKOV M.S.
Published: November 2004

We study the one-loop radiative correction to the mass operator of an S-wave fermion in the background monopole field and investigate whether it produces an efficient repulsive barrier outside the monopole core. It is shown that the ultraviolet divergency of this mass operator is eliminated by the usual renormalization of the fermion mass and electromagnetic charge in QED. The main result is that the radiative correction due to the interactions of the S-wave fermions with fluctuations of [Formula: see text] fields gives rise to finite and small, i.e. proportional to α≡e2/4π amplitude of the reflection of the incoming S-wave and therefore does not lead to any qualitative alterations of the standard mechanism of the monopole catalysis of proton decay.
RENORMALIZATION OF STOCHASTICALLY QUANTIZED FIELD THEORIES
Authors: CHATURVEDI S. , KAPOOR A.K. , SRINIVASAN V.
Published: November 2004

We discuss the renormalizability of stochastically quantized ϕ4 theory in four dimensions using the operator formalism of the Langevin equation developed by Namiki and Yamanaka. The operator formalism casts the Parisi Wu stochastic quantization scheme into a five-dimensional field theory. The usefulness of this approach over the one based directly on the Langevin equation is brought out for discussion of renormalization. We propose a new regularization scheme for the stochastic diagrams and use it to compute the renormalization constants and counter terms for the ϕ4 theory to second order in the coupling constant.
ELECTROWEAK BOSON SELF-COUPLINGS AND THE SCALE OF COMPOSITENESS
Authors: GRIFOLS J.A. , PERIS S. , SOLÅ J.
Published: November 2004

The experimental constraint on [Formula: see text] and the experimental rate of the process KL→μμ are used to bound hypothetical nonstandard self-interactions of the electroweak bosons. In particular, we give bounds on anomalous magnetic dipole and electric quadrupole moments of the charged weak boson.
SHADOWING IN SEMIHARD INTERACTIONS
Authors: AMETLLER Ll. , TRELEANI D.
Published: November 2004

We show how including multiple hard parton collisions one can define a hard hadronic cross section that cannot exceed the total one.
GENERALIZED CP INVARIANCE, NEUTRAL FLAVOR CONSERVATION AND THE STRUCTURE OF THE MIXING MATRIX
Authors: NEUFELD H. , GRIMUS W. , ECKER G.
Published: November 2004

CP invariance of SU (2)L× U (1) gauge theories is formulated in the most general way. Certain useful standard forms for CP transformations are presented. After a review of horizontal symmetries inducing neutral flavor conservation, we discuss a toy model where CP invariance enforces neutral flavor conservation in a nontrivial way. It is shown that spontaneous CP violation in its general form and neutral flavor conservation lead to a real mixing matrix for three generations. For more than three generations, the mixing matrix may violate CP. A complete analysis of the possible mixing matrices for any number of generations is performed for the usual case of real Yukawa couplings. If the mixing matrix violates CP, some of its elements must be equal in absolute magnitude. For four generations, all possible structures compatible with experiment are specified.
A GENERAL PROPERTY OF SPONTANEOUSLY BROKEN SUSY THEORIES
Authors: ANISHETTY R. , BASU RAHUL , SHARATCHANDRA H.S.
Published: November 2004

In theories with spontaneously broken supersymmetry the first partial derivatives of the superpotential are necessarily constrained by a functional identity. This is a consequence of Chevalley’s Theorem in algebraic geometry. Some implications of the above are also discussed.
THE 112 BREAKINGS OF E8
Authors: HOLLOWOOD T.J. , MYHILL R.G.
Published: November 2004

The 112 possible constructions of the basic representation of the E8 Kac-Moody algebra, corresponding to inequivalent gradings, are examined. In particular the invariant subalgebras and vacuum degeneracies are determined.
CLUSTERING PHENOMENA AND SHELL EFFECTS IN NUCLEAR STRUCTURE AND REACTIONS
Authors: RAE W.D.M.
Published: November 2004

Simple models are used to explore the relationship between cluster-like configurations and highly deformed states which arise as a result of shell effects in deformed single particle potentials for light nuclei. It is found that the systematics of the occurrence of clustering phenomena are closely related to the appearance of shell structure in these potentials. Considerable emphasis is placed on the use of the pure harmonic oscillator model as a first approximation.
SIZE AND SHAPE OF STRINGS
Authors: KARLINER M. , KLEBANOV I. , SUSSKIND L.
Published: November 2004

We study numerically and analytically spatial properties of the ground state of a fundamental string in the light-cone gauge. We find that strings are smooth and have divergent average size. Their properties are very different from what is expected from particles in a conventional field theory.
THE UNCERTAINTY OF THE GAUSSIAN EFFECTIVE POTENTIAL
Authors: MUÑOZ-TAPIA R. , TARON J. , TARRACH R.
Published: November 2004

An uncertainty is introduced for the Gaussian Effective Potential. The definition is quite straightforward for quantum mechanics but fairly subtle for quantum field theory. The uncertainty provides a good estimation of the error in the first case, but renormalization seems to spoil its usefulness in the second case. The examples considered are the anharmonic oscillator, λϕ4 in 3+1 dimensions and the Liouville theory in 1+1 dimensions.
NEXT-TO-LEADING LOGARITHM QCD CORRECTIONS FOR $q\bar q \to ZZ$, W+W−, W±Z SUBPROCESSES
Authors: BARGER V. , LOPEZ J.L. , PUTIKKA W.
Published: November 2004

We show that O(αs) QCD corrections for the [Formula: see text], W+W−, and W±Z subprocess cross sections are approximately given by a factor [Formula: see text] times the lowest order cross sections, as previously found for the Drell-Yan [Formula: see text] subprocess. The calculations are made in the limit of soft virtual or real gluons. The result is confirmed for the high energy limit of [Formula: see text] by analogy with exact calculations of [Formula: see text] and Zγ cross sections.
THEORY AND PHENOMENOLOGY OF ISOSPIN BALLS
Authors: BALACHANDRAN A.P. , RAI B. , SPARANO G. , SRIVASTAVA A.M.
Published: November 2004

We have reported elsewhere1 that nontopological solitons are predicted by a class of chiral models which incorporate the scale anomaly. These solitons exist for all values of isospin which exceed a critical value IC. They often resemble large uniform spherical lumps of matter for large isospin just as the Q balls of Coleman. In this paper, we describe the properties of these solitons in detail and also discuss their phenomenology.
POLARIZED PROTON AND ANTIPROTON BEAMS AT FERMILAB AND ASSOCIATED EXPERIMENTS
Authors: YOKOSAWA AKIHIKO
Published: November 2004

We describe the polarized proton and antiproton beams up to 200 GeV/c in the Fermilab MP beam line which is currently operational. We also present the Fermilab polarized beam program using this facility. These Fermilab polarization projects are designated as E-581/704 initiated and carried out by an international collaboration, Argonne (USA), Fermilab (USA), Kyoto (Japan), LAPP-Annecy (France), Northwestern University (USA), Los Alamos Laboratory (USA), Rice (USA), CEN-Saclay (France), Serpukhov (USSR), INFN Trieste (Italy), and University of Texas (USA).
EFFECTS OF AN EXTRA NEUTRAL E6 GAUGE BOSON IN e+e− ANNIHILATION INTO HADRONS
Authors: CSIKOR F. , LENDVAI E. , PÓCSIK G.
Published: November 2004

We calculate the influence of an extra neutral E6 gauge boson on the energy weighted and total cross sections in e+e− annihilation into hadrons. Longitudinal and azimuthal asymmetries are sensitive to the various extra U(1) factors and can show noticeable deviations from the standard model.
GROSS-NEVEU MODEL IN CURVED SPACE-TIME: THE EFFECTIVE POTENTIAL AND CURVATURE-INDUCED PHASE TRANSITION
Authors: BUCHBINDER I. L. , KIRILLOVA E. N.
Published: November 2004

The Gross-Neveu model in external gravitational field has been considered. The Green's function in constant curvature space has been found, whereby one has obtained the one-loop effective potential. It has been shown that the restoration of spontaneously broken symmetry occurs in the form of the second order curvature-induced phase transition.
SCALAR FIELDS IN THE DIMENSIONAL REDUCTION SCHEME FOR SYMMETRIC SPACES
Authors: KUBYSHIN YU. A. , MOURĀO J. M. , VOLOBUJEV I. P.
Published: November 2004

We study the general features of the dimensional reduction scheme for multi-dimensional spaces of the type M4 × S/R, S/R being a symmetric coset space. The properties of the scalar potentials of the reduced theories are investigated and an effective method of explicit calculation of these potentials is elaborated. We consider also a wide class of embeddings of Lie subalgebras into simple Lie algebras resulting in reduced theories of physical interst.
GEOMETRICAL AND DYNAMICAL MULTIPLICITY FLUCTUATIONS IN HIGH-ENERGY NUCLEAR COLLISIONS
Authors: HWA RUDOLPH C.
Published: November 2004

General properties of multiplicity fluctuation in high-energy nuclear collisions are considered. Quantities that can directly be related to the geometrical and dynamical sources of the fluctuation are identified. Formalism for treating impact-parameter selection is discussed. The connection with correlation is described. Recent data indicate the absence of any significant collective behavior in the current experiments at the SPS. The observable that can reveal the onset of such behavior is suggested.
TWO-LOOP RENORMALIZATION GROUP CORRECTIONS IN SO(10) AXION MODELS AND PROTON LIFETIME
Authors: WANG XING-MIN
Published: November 2004

A simplified way to calculate the two-loop corrections to the renormalization group equations is investigated and applied to two SO(10) axion models. It is found that the grand unification mass scale Mx is reduced by a factor ~ 1.5 – 3. And in both models, there exist solutions with Mx ~ 1015 Gev , corresponding to a proton lifetime [Formula: see text] when sin 2 θw, αs and αe are chosen within the experimental error range.
CRITICAL DIMENSION FOR THE SIEGEL ACTION WITH SUPERSYMMETRIC CHIRAL BOSONS ON GROUP MANIFOLDS
Authors: YU FENG , WU YONG-SHI
Published: November 2004

A classical covariant action which has the Siegel symmetry is constructed for supersymmetric chiral bosons in arbitrary curved space-time coupled to (1,0) world-sheet supergravity. The critical dimension is derived by two methods for such an action with leftons and rightons compactified on group manifolds GL × GR, i.e. by requiring either the closure of the Lorentz algebra in the uncompactified Minkowski space-time in the light-cone gauge approach or the cancellation of both the Siegel and conformal anomalies in the covariant approach. It turns out that the results in the two approaches generally do not agree with each other; in particular, some critical dimensions allowed in the light-cone gauge approach do not lead to anomaly cancellation in the covariant approach. This disagreement represents a pathological feature of Siegel's covariant approach (with usual gauge-fixing procedure) to supersymmetric chiral bosons.
TWISTED VERTEX OPERATORS AND REPRESENTATIONS OF FINITE HEISENBERG GROUPS
Authors: ALTSCHÜLER D. , BÉRAN P. , LACKI J. , RODITI I.
Published: November 2004

We discuss the construction of simply-laced affine algebras via twisted Vertex operators. Special care is given to the explicit determination of the "zero-mode" part of the vertices. The result can be neatly formulated in terms of finite Heisenberg groups, thereby reflecting the underlying quantization problem for the motion of the center-of-mass of the string, which takes place in a nonconnected manifold.
DETERMINANTS, DIRAC OPERATORS, AND ONE-LOOP PHYSICS
Authors: BLAU STEVEN K. , VISSER MATT , WIPF ANDREAS
Published: November 2004

We consider the Dirac operator. Its determinant is examined and in two Euclidean dimensions is explicitly evaluated in terms of geometrical quantities. This leads us to consider a generalization of the Wess-Zumino action that is applicable to arbitrary genus. Our analysis is relevant to a number of interesting systems: Schwinger models on curved two-manifolds; string theories with world-sheet vectors; and as an exploration of possible directions in evaluating determinants in four dimensions.
HIGH TEMPERATURE BEHAVIOR OF COUPLING CONSTANTS IN O’RAIFEARTAIGH MODEL
Authors: CHIA SWEE-PING
Published: November 2004

The effective coupling constants for the O’Raifeartaigh model are calculated at high temperature using the improved one-loop approximation. The 3-point bosonic and the Yukawa coupling constants are found to tend to constant nonzero values as T→∞. The 4-point bosonic coupling constants, on the other hand, behave differently. They are found to decrease to zero logarithmically with T.
SYMMETRY REORGANIZATION IN EXACTLY SOLVABLE TWO-DIMENSIONAL QUANTIZED SUPERGRAVITY
Authors: DASS N.D. HARI , SUMITRA R.
Published: November 2004

A recent work of Polyakov solving exactly the two-dimensional induced quantum gravity is extended to the two-dimensional induced (1,0) quantum supergravity theory. This theory is found to be exactly integrable in a supersymmetric version of the light cone gauge. Solutions are found to display an infinite dimensional Z2 graded sl(2, R) invariance and a diffeomorphism invariance in one of the coordinates. The origin of these invariances is traced to motions along the gauge slice. A Sugawara construction based on the currents of the infinite dimensional transformations is shown to generate these diffeomorphisms. Explicit results are given for a number of quantum correlation functions.
THE DYNAMICS OF OPEN STRINGS IN A BACKGROUND ELECTROMAGNETIC FIELD
Authors: NESTERENKO V.V.
Published: November 2004

The classical and quantum dynamics of an open bosonic string propagating in the D-dimensional space-time in the presence of a background electromagnetic field is investigated. An important point in this consideration is the use of the generalized light-like gauge. There are considered the two types of strings: the neutral strings with charges at their ends obeying the condition q1+q2=0 and the charged strings having a net charge q1+q2≠0. The consistency of the theory demands that the background electric field does not exceed its critical value. The distance between the mass levels of the neutral open string decreases (1−e2) times in comparison with the free string where e is the dimensionless strength of the electric field. The magnetic field does not affect this distance. It is shown that at a classical level, the squared mass of the neutral open string has a tachyonic contribution due to the motion of the string as a whole in transverse directions. The tachyonic term disappears if one considers, instead of M2, the string energy in a special reference frame where the projection of the total canonical momentum of the string onto the electric field vanishes. The contributions due to zero point fluctuations to the energy spectrum of the neutral string and to the Virasoro operators in the theory of charged string are found. It is shown that the constraint on the strength of an external electric field is absent when the open bosonic string is placed in an external electromagnetic field of a special configuration. In the case of four-dimensional space-time, it corresponds to the electric and magnetic fields which are equal and perpendicular to each other (isotropic configuration). The external electromagnetic field does not act on the fermionic variables of the spinning string.
NONLINEAR REALIZATION OF SUPERSYMMETRY BASED ON THE FRAME MATRIX REPRESENTATION OF THE GRASSMANN MANIFOLD—GEOMETRICAL MEANING OF THE ξ-FIELD IN A SUPERSYMMETRIC EXTENSION OF LOCAL LORENTZ SYMMETRY
Authors: KANNO HIROAKI
Published: November 2004

Using the frame matrix representation of the Grassmann manifold, we derive a nonlinear realization of the general linear group. We show that its super-extension reproduces the ξ-field which appears in the recent work on a supersymmetric extension of local Lorentz symmetry by Abe and Nakanishi. This clarifies the geometrical meaning of the ξ-field and we discuss its properties on the basis of this interpretation. The similarity of this ξ-field and the vierbein field is pointed out.
THE STRUCTURE OF ONE-LOOP COUNTERTERMS OF YANG-MILLS THEORY IN THE LIGHT CONE GAUGE
Authors: SCHWEDA M. , SKARKE H.
Published: November 2004

We prove a theorem concerning the structure of one-loop integrals in the light cone gauge. With the help of this theorem, we analyze the structure of possible counterterms.
NONLINEAR QUANTUM MECHANICS WITH NONCLASSICAL GRAVITATIONAL SELF-INTERACTION
Authors: POPOVA A.D.
Published: November 2004

The original approach for the self-consistent inclusion of gravity into quantum mechanics of a particle is developed. (There are no connections with second quantization.) The nonstandard action principle is constructed for the stationary situation: the quantum particle in a stationary state creating some nonclassical stationary gravitational field and interacting with it, The accompanying problem of covariantization of quantum operators is considered. The general theory is illustrated by the Newtonian-Schrödingerian and quasi classical limiting cases. The levels of applicability of ordinary quantum mechanics and the problems of measurements and interpretation of nonclassical gravity are discussed. The “uncertainty relations” connecting uncertainties of some “local” parts of curvature and those of the particle’s position and momentum are derived. The superposition principle is generalized on the base of some approximate action.
EXPANDING THE CLASS OF SPECTRAL PROBLEMS WITH PARTIAL ALGEBRAIZATION
Authors: SHIFMAN M.A.
Published: November 2004

The phenomenon of the partial algebraization in the Schrödinger-type equations with a hidden dynamical symmetry is discussed. A generalization of the Turbiner procedure is proposed which can expand the class of the quasi-exactly-solvable problems. A specific example relevant to a one-dimensional Hamiltonian with the SU(2) hidden symmetry is constructed.
RELATIVISTIC ROTATING DISK: THE EXTERNAL FIELD
Authors: TURAKULOV Z. YA.
Published: November 2004

Three-parametric family of models of the space-time containing an infinitesimally thin rotating disk is constructed. The manifolds are piecewise-smooth and consist of two smooth regions which are the Kerr space pieces. The curvature has the singularity on the common boundary of the smooth regions in the form of one-dimensonal δ-function and the Einstein tensor consists of its singular terms only. The boundary forms the source of the gravitational field which is an infinitesimally thin disk in form. It is shown that each geodesic tangent to the disk is wholly lying on it. The shape of the Einstein tensor indicates the absence of the pressure and motion of the source matter in the direction normal to the disk.
GEOMETRICAL CONSTRAINTS FOR D = 10, N = 1 SUPERGRAVITY
Authors: CHAU LING-LIE , LIM CHONG-SA
Published: November 2004

A set of geometrical constraints for D = 10, N = 1 supergravity is formulated. It has the meaning as integrability conditions on "hyperplanes" determined by light-like lines in the superspace. The dynamical consequence of these geometrical constraints is studied via Bianchi identities. Since no equations of motion have resulted, these geometrical constraints can form an off-shell set of constraints for the theory. We also discuss additional constraints that lead to Poincare supergravity equations of motion. The relation of the theory with D = 4 N = 4 supergravity is also illuminated.
MASSIVE RELATIVISTIC POINT PARTICLE WITH RIGIDITY
Authors: PLYUSHCHAY M. S.
Published: November 2004

The model of relativistic point particle, whose Lagrangian contains a linear dependence on the curvature of the particle world trajectory, is studied. The restriction on the admissible range of parameter α, standing as multiplier α−1 in the Lagrangian term with curvature, is shown to arise in the theory. The general solution of the equations of motion and quantum theory of the system are constructed in the sector with time-like vector of energy-momentum.
THE QUANTIZATION OF THE SUPERMEMBRANE
Authors: POPE C. N. , STELLE K. S.
Published: November 2004

We review recent work on the quantum structure of the supermembrane, focusing in particular on the issues of supersymmetry breaking, the existence of massless states, and the nature of the mass spectrum.
RESOLUTION EFFECTS ON Z′ OBSERVABLES
Authors: DEL AGUILA F. , VIDAL J.
Published: November 2004

We discuss the relevant observables, near the resonant peak, characterizing the interactions of a new neutral gauge boson Z′ for the process pp → l+l− at SSC and LHC. Some of these observables are sensitively dependent on a high resolution. Numerical examples are given for a heavy Z′ (~1 TeV ) and for some models motivated by superstrings.
ANOMALOUS GAUSS LAW ALGEBRAS
Authors: FLOREANINI R. , PERCACCI R.
Published: November 2004

Supplementing the Gauss law operator of an anomalous gauge theory with a certain set of functionals of the gauge potentials, one obtains a closed algebra. The algebras obtained in this way are Abelian extensions of the Lie algebra of the group of gauge transformations, and are natural generalizations of Kac-Moody algebras, both in two and four dimensions.
BOUNDARY AND CROSSCAP STATES IN COMPACTIFICATIONS OF OPEN AND CLOSED BOSONIC STRINGS
Authors: DUNBAR DAVID C.
Published: November 2004

Orbifold compactifications of open and closed bosonic strings are examined and constrained by unitarity requirements. In particular, the role of crosscap and boundary states in evaluating amplitudes is investigated.
BRS COHOMOLOGY AND 2d GRAVITY
Authors: HORVÁTH Z. , PALLA L. , VECSERNYÉS P.
Published: November 2004

The physical subspace of the SL (2, R) current algebra based model of induced 2d gravity is investigated. Using an appropriate ground state, an equation guaranteeing the non-negativity of this subspace is derived using a BRS analysis. In case of the ground state allowing the derivation of simple differential equations for the correlation functions the presence of an SL (2, R) background charge is exhibited. It is shown that changing one ground state for the other converts the KPZ equation for the anomalous dimensions to the previous equation for physical states.
THE NONEQUILIBRIUM DESCRIPTION OF SUPERRADIANT STATE ON THE BASIS OF EXACT EVOLUTION EQUATION
Authors: BOGOLUBOV N.N. , KAZARYAN A.R. , KURBATOV A.M. , NESKOROMNYI V.N.
Published: November 2004

The non-equilibrium quantum statistical conditions of the superradiant decay are derived in the framework of the Bogolubov method for eliminating the Bose-operators. Two time scales are introduced in order to advance the concept of quasi-stationary states that makes it possible to use the main achievements of the equilibrium description. With the self-consistent field approximation and the small value of the coupling constant the conditions are shown to be in good agreement with the recent experiments on superradiance in mixed crystals carried out by the Dusseldorf group.
SUPERCONDUCTIVITY IN Y(BAxSR1−x)CUO SYSTEM
Authors: Liu Jinxiang , Chang Yinchuan , Shao Xiuyu , Cao Ning , Duan Zhanguo , Zou Xiaodong , Fan Hui , Hou Deseng , Ran Qizhe , Zheng Jiaqi , Guan Weiyan
Published: November 2004

A number of samples with the nominal formula Y 0.4( Ba x Sr 1−x)0.6 Cu O 3, Y 0.5( Ba x Sr 1−x)0.5 CuO 3 and Y 1.2 ( Ba x Sr 1−x)0.8 CuO 4 have been made. It is found that for x=0 the samples show no superconductivity but for x>0.008 samples do show superconductivity, and for x=0.008, 0.005 the samples have high normal resistivity and no resistive transition but show diamagnetism at about 70k. The structure analysis find a smaller distortion in the the sample Y 0.5( Ba 0.01 Sr 0.99)0.5 CuO 3 than that in YBa 2 Cu 3 O 9−y. The relation between superconductivity and the ionic radius is discussed.
THE COMPOSITION AND STRUCTURE OF Y-Ba-Cu-O SUPERCONDUCTORS
Authors: Hua Z.Y. , Jia C.L. , Cheng H.S. , Cai Y.M. , Jiang A.R.
Published: November 2004

High Tc superconductors of Y-Ba-Cu-O system with (Y+Ba):Cu=1~2 have been investigated. Results show that any sample in this system with a proportion of Y:Cu between 0.6 and 1.2 is oxygen-deficient and will be superconductive after sintering in an oxygen flow. In this system all superconductors with different nominal composition have a superconductive phase of perovskite-1ike YBa2Cu3O7 (Phase A), and the difference of constituents is shown in another phase (Phase B) which acts as a gettering center. When the composition has an excess of Y, there will be a third phase (Phase C) which has been identified as small particles of Y2O3 . For an exact nominal proportion of Y:Ba:Cu=1:2:3 , single-phase superconductors can be prepared.
STUDY ON PHASE DIAGRAM OF BaO-Y2O3-CuO TERNARY SYSTEM
Authors: Che Guangcan , Liang Jingkui , Chen Wei , Xie Sishen , Yu Yude , Yang Qiansheng , Ni Yuengming , Lui Guirueng , Chen Genghua
Published: November 2004

In Ba-R-Cu-O system (R=La, Y) , high Tc superconductor have been discovered (1–3). The room temperature section of the phase diagram in BaO-Y2O3-CuO system has been completed by means of X-ray diffraction, thermal analysis and superconducting measurements.
Anisotropic Magnetization in Single Crystal YBa2Cu3O7
Authors: Shelton R.N. , McCallum R.W. , Damento M.A. , Gschneidner K.A.
Published: November 2004

Magnetization measurements on single crystals of YBa2Cu3O7 are used to study the anisotropy of the critical current density and magnetic properties of this superconducting oxide with a transition temperature of 88 K. Anisotropy of the magnetization versus applied field hysteresis loops is pronounced, with the effect increasing as the temperature approaches the superconducting critical temperature.
MÖSSBAUER SPECTRUM AND SUPERCONDUCTIVITY OF SINGLE PHASE EuxY1−xBa2Cu3O9−δ
Authors: Lu H.X. , Zhang X.Y. , Gao X.K. , Wu J. , Mao X.Y. , Zhang Y.C. , Sun D.K. , Wang H.Q. , Huang J.P. , Asher R.
Published: November 2004

High temperature superconducting compounds in a series of EuxY1−x-Ba2Cu3O9−δ chemical systems, have been prepared and identified, as a single phase. The zero resistance have been determined. X-ray measure ments indicate that the sample is a single phase and Y is replaced by Eu. With Mössbauer spectroscopy, it has been determined that Eu is trivalent and the Eu site is very symmetric. The oxygen sites about Eu are nearly completely occupied. Specific heat has been measured about Eu0.4Y0.6Ba2Cu3O9−δ sample. It is shown that there is a transition from normal state to superconducting state at 90 K with a specific heat change, ΔCp≃20 mJ/g.K.