bluuebunny/crossref_metadata_2025 huggingface dataset:
SUPERSYMMETRIC TENSOR GAUGE THEORIES
Authors: CLARK T.E. , LEE C.-H. , LOVE S.T.
Published: November 2004

The supersymmetric extensions of anti-symmetric tensor gauge theories and their associated tensor gauge symmetry transformations are constructed. The classical equivalence between such supersymmetric tensor gauge theories and supersymmetric non-linear sigma models is established. The global symmetry of the supersymmetric tensor gauge theory is gauged and the locally invariant action is obtained. The supercurrent on the Kähler manifold is found in terms of the supersymmetric tensor gauge field.
SPHERICALLY SYMMETRIC SO(4) INSTANTON OF A NON-ABELIAN HIGGS MODEL IN 4-DIMENSIONS
Authors: O’BRIEN G.M. , TCHRAKIAN D.H.
Published: November 2004

A spherically symmetric instanton of a 4-dimensional non-Abelian Higgs model descended from a generalised Yang-Mills system, is presented. This instanton is not selfdual.
QUANTUM SYMMETRIES OF STRING VACUA
Authors: VAFA CUMRUN
Published: November 2004

We show that for a large class of string vacua, by a proper tuning of the metric (and the axionic fields), one obtains global symmetries. Moreover, the string vacua which arise as orbifoldized Landau-Ginzburg models are equipped with precisely this metric. These symmetries are not symmetries of the underlying manifold, rather they are symmetries of the superconformal theory manifest only at the Quantum level. These generalize the duality symmetries well known for toroidal compactifications, to a large class of string vacua. Moreover we discuss in detail the global symmetries of the quantum K3 space, and present evidence that the global symmetries of the moduli space of this theory is SO (20, 4; Z).
TESTING THE EQUIVALENCE PRINCIPLE WITH (g–2) MEASUREMENTS
Authors: GASPERINI M.
Published: November 2004

It is stressed that an experiment able to reach the level of sensitivity required to measure the contribution of gravity to the magnetic moment of a particle, may also be interpreted as a test of unified theories that predict deviations from the Einstein equivalence principle.
PERCOLATION ON A FRACTAL WITH THE STATISTICS OF PLANAR FEYNMAN GRAPHS: EXACT SOLUTION
Authors: KAZAKOV V.A.
Published: November 2004

A new bond-percolation problem on a graph (fractal) randomly chosen from all planar Feynman graphs of zero-dimensional φ3 (or φ4) theory in the thermodynamical limit (infinite order of graphs) is solved exactly. At the percolation transition point pc the mean number of clusters per volume unit has the singularity (pc−p)4 log (pc−p) which corresponds to the critical exponent α=−2. This model is a particular example of Potts models on dynamical planar lattice1 and the result agrees with the formulae obtained in Ref. 2 by conformal field theory approach for Potts spins interacting with 2D quantum gravity.
NON MINIMAL ANOMALY FREE D=10, N=1 SUGRA-SYM AND FOUR-GRAVITON SUPERSTRING AMPLITUDES
Authors: LECHNER KURT , PASTI PAOLO
Published: November 2004

A class of non minimal extensions of anomaly free D=10, N=1SUGRA—SYM, formulated in superspace, is proposed. The new models are obtained modifying suitably standard superspace constraints of the minimal one. It is shown that the proposed models are likely to accommodate the effective four-bosons superstring amplitudes. The relation existing between consistently quantized heterotic string sigma models and the consistency of our construction is exhibited.
A STREAMLINED HIGHEST WEIGHT DERIVATION OF THE BILINEAR VIRASORO CENTRE
Authors: GORMAN N. , O’RAIFEARTAIGH L. , McGLINN W.
Published: November 2004

We derive the universal formula c=±(D+6J), where [Formula: see text] for the centre c of any Virasoro algebra constructed as a bilinear in D free fields of conformal spins ja. The derivation is extremely simple and relies only on the highest weight nature of the field representation. An analogous simple derivation of the corresponding result c=2K dim G/(2K+f2) for KM fields is also given.
EFFECTIVE LAGRANGIAN FOR PSEUDOSCALAR MESONS FROM LINEAR SU(3)×SU(3) SIGMA MODEL WITH VECTOR AND AXIAL MESONS
Authors: ANDREEV I.V. , TSYPIN M.M.
Published: November 2004

The effective Lagrangian for pseudoscalar meson octet including terms up to fourth order in momenta and masses is derived from a linear sigma model with vector and axial mesons. The mass of scalar meson nonet 720±75 MeV ensures a good fit of coefficients in effective Lagrangian with values derived from experiment.
SYMMETRIES OF A CHARGE-DIRAC MONOPOLE SYSTEM
Authors: SAVINKOV A.G. , RYZHOV A.B.
Published: November 2004

It is found a representation for Hamiltonian of a charged particle in the Dirac monopole field in a total space of principal bundle, which has a very simple form, so that symmetries of the Hamiltonian become explicit.
EFFECTIVE BOUNDARY ACTION IN THE FERMIONIC STRING THEORY
Authors: MARSHAKOV A.V.
Published: November 2004

The Polyakov path integral on Riemann surfaces with boundaries for the Neveu-Schwarz-Ramond (NSR) fermionic string is computed in the case of a special choice of the local boundary conditions for the fermionic fields. Effective boundary action is written explicitly by means of the functions defined on the double of the surface. The obtained expressions are used to study the behavior of the string propagator in the configuration space. The generalization of the effective fermionic action to the case of nonarchimedean strings is discussed.
ON THE HIGHER ORDER CORRECTIONS IN THE INTEGRALS OF MOTION AWAY FROM CRITICALITY
Authors: KODAIRA J. , SASAI Y. , SATO H.
Published: November 2004

We study the two-dimensional model away from criticality, We point out the origin of the higher order corrections in the nontrivial integrals of motion formally constructed by Zamolodchikov. Explicit expressions are given in the case of p=3 (Ising model) and p=5 (three-state Potts model) for the spin 4 current.
THE ΔI=1/2 RULE IN Ke3 DECAYS AND ISOSPIN BREAKING CORRECTIONS
Authors: CASTRO GABRIEL LOPEZ , PESTIEAU JEAN
Published: November 2004

It is shown that the current experimental deviation from the ΔI=1/2 rule prediction for the ratio [Formula: see text] requires important contributions from SU(2) breaking corrections due to quark mass differences. The symmetry breaking corrections to the Ke3 vector form factors calculated in chiral perturbation theory do not explain this result. We argue that this fact could increase the value of |Vus| extracted from Ke3.
COHERENT STATES IN PARASUPERSYMMETRIC QUANTUM MECHANICS
Authors: BECKERS J. , DEBERGH N.
Published: November 2004

New parasupersymmetric coherent states are determined as eigenstates of an annihilation operator. They are the closest parasupersymmetric states to the classical ones.
QUANTUM MECHANICS AND PATH INTEGRALS IN SPACES WITH CURVATURE AND TORSION
Authors: KLEINERT H.
Published: November 2004

We point out that there is a natural geometric procedure for constructing the quantum theory of a particle in a general metric-affine space with curvature and torsion. Quantization rules are presented and expressed in the form of a simple path integral formula which specifies compactly a new combined equivalence and correspondence principle. The associated Schrödinger equation has no extra curvature nor torsion terms that have plagued earlier attempts. Several well-known physical systems are invoked to suggest the correctness of the proposed theory.
BOSONIZATION AND FERMION VERTICES ON AN ARBITRARY GENUS RIEMANN SURFACE BY USING A GLOBAL OPERATOR FORMALISM
Authors: RUSSO JORGE
Published: November 2004

Fermi-Bose equivalence is studied with the use of a global operator formalism on Riemann surfaces of arbitrary topology. The quantization of a scalar field on a circle is performed in detail, globally, at arbitrary genus. A new algebra of the Krichever-Novikov type naturally emerges. This admits three central extensions and generalizes standard algebras of the sphere to higher genus. It is shown by explicit computation that the central terms, as well as correlation functions, corresponding to the Bose and Fermi models agree. Spin fields and fermion vertices are defined within this framework and their conformal properties are investigated.
GEOMETRY OF QUANTUM LOOPS AND KNOT THEORY
Authors: AWADA M.A.
Published: November 2004

Starting from the linear quantum loop equation of non-abelian Chern-Simons theory in three dimensions, we prove that it yields precisely and to all loop orders in perturbation theory the exact skein relation satisfied by the Jones polynomial in knot theory.
ABELIAN GAUGE THEORY IN TOPOLOGICALLY NON-TRIVIAL SPACE
Authors: HOSOYA AKIO , SODA JIRO
Published: November 2004

We quantize the (1+1)-dimensional Abelian gauge theory on cylinder to illustrate our idea how to extract global modes of topological origin. A new analysis is made for the (2+1)-dimensional Maxwell theory on T2(torus)×R(time). The dynamics is explicitly given for the Wilson loops around cycles of the torus with arbitrary moduli parameters. We also discuss an extension to antisymmetric tensor fields in higher dimensions.
ONE LOOP-INDUCED WZH COUPLING IN THE TWO HIGGS DOUBLET MODEL
Authors: RIZZO THOMAS G.
Published: November 2004

Although absent at the tree level in models with only doublet and singlet Higgs representations, the WZH coupling can be induced at the one-loop level. We examine the size of this induced coupling in the two Higgs doublet model due to fermion as well as Higgs/gauge boson loops. Such couplings could provide a new mechanism for charged Higgs production at colliders and are ‘backgrounds’ to new physics beyond the Standard Model. We find, however, that these couplings are very weak for all regions of the parameter space explored.
A SCALAR-TENSOR THEORY FOR INDUCED GRAVITY
Authors: BOUTALEB-J. H. , MARRAKCH A. L.
Published: November 2004

A scalar-tensor theory for induced gravity is presented. Einstein's gravity appears as the low-energy limit of such a theory. It is shown that the spontaneous symmetry breaking can occur at any epoch of the universe and that this mechanism can also be responsible for breaking the unified gauge group SU(5) into SU (3) × SU (2) × U (1). Also, it is shown that, if the spontaneous symmetry breaking is accomplished by means of the Coleman-Weinberg potential minimum, the induced gravitational constant can, with a suitable choice of the coupling function, increase as one dates back.
EVOLUTION OF ISOCURVATURE PERTURBATIONS II: RADIATION-DUST UNIVERSE
Authors: KODAMA HIDEO , SASAKI MISAO
Published: November 2004

Density perturbations in a universe in which matter consists of noninteracting nonrelativistic particles(dust) and strongly coupled photon-baryon fluid(radiation) are analyzed in terms of the gauge-invariant formalism extended to a multi-component system. Detailed analytic estimate is presented for the time evolution of both primordially adiabatic and primordially isocurvature perturbations. In particular, analytic formulas for characteristic scales appearing in the transfer functions are derived. The evolutionary behavior of these two types of perturbations are compared and the origins of their differences and similarities are clarified.
FIRST RESULTS FROM THE AMY DETECTOR AT TRISTAN
Authors: Imlay R.
Published: November 2004

Bhabha scattering and multi-hadronic e+e− annihilation events have been observed in the AMY detector at √s=500 GeV at the TRISTAN e+e− storage ring. Here we report the results of a preliminary analysis of the properties of these events. Of particular note is one event that contains a high energy, isolated gamma ray together with a large amount of missing momentum that penetrates the fiducial volume of the detector.
PRODUCTION OF HEAVY SQUARKONIUM AT THE SSC
Authors: Herrero M.J. , Méndez A. , Rizzo T.G.
Published: November 2004

We study the production of heavy bound states of squarks at the SSC and analyse their decays into longitudinal W’s and Z’s. In some situations a squarkonium state can be detected through its decay into a pair of W’s.
GLUINO DECAYS TO W AND Z BOSONS AT THE SSC
Authors: Baer Howard , Barnett R. Michael , Drees Manuel , Gunion John F. , Haber Howard E. , Karatas Debra L. , Tata Xerxes R.
Published: November 2004

It is shown that, for a wide range of parameters, the dominant decays of gluinos with mass ≳500 GeV contain gauge bosons, W± and Z, among their decay products. The pair production of heavy gluinos at the SSC is thus characterized by events with 3–4 hard jets and pairs of gauge bosons. The cleanest signature comes from the case where both gluinos decay into Z followed by [Formula: see text] which leads to ~50–100 4-lepton + multijet events annually at the SSC. In addition, 1600 trilepton + multijet and about 6000 dilepton + multijet events may be expected from WZ and WW sources. The backgrounds to these signals are estimated to be small.
SIGNAL FOR SUPERSTRING QUARK SINGLET PRODUCTION: VIOLATION OF FLAVOR UNIVERSALITY
Authors: Barger V. , Deshpande N.G. , Hagiwara K.
Published: November 2004

We investigate the signatures of leptoquarks or diquarks of the rank 5 E6 superstring model produced in [Formula: see text] and pp machines. Leptoquark decays are characterized by lack of e, μ universality [Formula: see text] and diquark decays by quark flavor non-conservation (e.g., [Formula: see text]). If the top quark is heavier than one of the scalar superpartners [Formula: see text], then it may decay dominantly by two body modes (e.g., [Formula: see text] or [Formula: see text]), invalidating the usual signatures. Two body gluino decays [Formula: see text] may swamp its conventional signatures.
HADRO-PRODUCTION OF SCALAR LEPTOQUARKS
Authors: Hewett J.L. , Pakvasa S.
Published: November 2004

We examine the single and pair production of scalar leptoquarks (S) in pp and [Formula: see text] collisions. The signals and backgrounds for leptoquark production are discussed. We find that the discovery limits for pair production are M S ≃40 GeV at the CERN collider, 120 GeV at the Tevatron, and 1.7 TeV at the proposed SSC. The limits in the case of single S production are found to be model dependent.
QCD Working Group Summary
Authors: Bengtsson H.-U. , Gottschalk T.D. , Paige F.E.
Published: November 2004

The status of Monte Carlo and other perturbative QCD calculations for signals and backgrounds in hadronic collisions is reviewed, and possibilities for improvements are discussed.
HARD SCATTERING QCD CORRECTIONS IN MONTE CARLO SHOWER MODELS
Authors: Gottschalk Thomas D.
Published: November 2004

The problem of incorporating exact 2→3 QCD cross sections into Monte Carlo models for hadron-hadron scattering is examined, and a simple, branching weight formalism which retains all the information of the 2→3 processes is presented. The connection of this prescription with the angle-ordered soft gluon results of Ellis, Marchesini and Webber is explored in detail. Possible unresolved questions for the procedure are also noted.
MOMENTUM-SUBTRACTION RENORMALIZATION TECHNIQUES IN CURVED SPACE-TIME
Authors: FODA OMAR
Published: November 2004

Momentum-subtraction techniques, specifically BPHZ and Zimmermann’s Normal Product algorithm, are introduced as useful tools in the study of quantum field theories in the presence of background fields. In a model of a self-interacting massive scalar field, conformally coupled to a general asymptotically-flat curved space-time with a trivial topology, momentum-subtractions are shown to respect invariance under general coordinate transformations. As an illustration, general expressions for the trace anomalies are derived, and checked by explicit evaluation of the purely gravitational contributions in the free field theory limit. Furthermore, the trace of the renormalized energy-momentum tensor is shown to vanish at the Gell-Mann Low eigenvalue as it should.
COMMENTS ABOUT THE GEOMETRY OF NONLINEAR SIGMA MODELS
Authors: COQUEREAUX ROBERT
Published: November 2004

Geometrical aspects of several classes of σ models are studied. The geometrical meaning of perturbative quantum field theory is discussed in the content of nonlinear σ models. Results on the one-loop effective action are recovered and generalized.
THE (4, 0) AND (4, 4) SUPERSYMMETRIC NONLINEAR σ-MODELS IN THE D=2 HARMONIC SUPERSPACE
Authors: LHALLABI T. , SAIDI E.H.
Published: November 2004

The D=2 (4, 0) and (4, 4) harmonic superspace are constructed. Nonlinear supersymmetric σ-models for both real and complex (4, 0) matter multiplets are obtained. Other features are also discussed.
THREE ELABORATIONS ON BERRY’S CONNECTION, CURVATURE AND PHASE
Authors: JACKIW R.
Published: November 2004

We discuss how symmetries and conservation laws are affected when Berry’s phase occurs in a quantum system: symmetry transformations of coordinates have to be supplemented by gauge transformations of Berry’s connection, and consequently constants of motion acquire terms beyond the familiar kinematical ones. We show how symmetries of a problem determine Berry’s connection, curvature and, once a specific path is chosen, the phase as well. Moreover, higher order corrections are also fixed. We demonstrate that in some instances Berry’s curvature and phase can be removed by a globally well-defined, time-dependent canonical transformation. Finally, we describe how field theoretic anomalies may be viewed as manifestations of Berry’s phase.
A FUNCTIONAL LIGHT-CONE GAUGE CONSTRUCTION OF A BOSONIC STRING COMPACTIFIED ON A TORUS
Authors: BRESSLOFF P.C. , TAYLOR J.G. , RESTUCCIA A.
Published: November 2004

The closed bosonic string compactified on a torus is decomposed into two open strings corresponding to left and right movers respectively. Multiloop amplitudes are expressed as a product of a holomorphic and an anti-holomorphic function of the moduli of the world-sheet Riemann surface. Such a product is obtained by analytically continuing left and right open string amplitudes such that one is the complex conjugate of the other. A justification for this analytic continuation is provided using a second quantized field theory of strings. The extra parameters needed for complexification are shown to arise from the constraint expressing invariance under choice of origin for string parametrization. The chiral string is discussed.
CONSTRAINED SUPERFIELDS AND SUPERSYMMETRIC MAGNETIC FIELD SYSTEMS
Authors: DEHIN D. , HUSSIN V.
Published: November 2004

After Lancaster we examine chiral constraints in N=2 superspace formulation for super-symmetric magnetic field systems. Such odd constraints are connected with the so-called spinorbit coupling procedure of supersymmetrization. We also propose new even constraints for magnetic supersymmetric systems and relate them to the standard procedure enhanced by Witten. These models describing spin-one half particles moving in a plane with a transverse magnetic field are compared and discussed. The cases of a constant magnetic field and of the harmonic oscillator are connected through different correspondences.
TOWARDS A CONFORMAL QED4 WITH A NONVANISHING CURRENT 2-POINT FUNCTION
Authors: STANEV YASSEN S. , TODOROV IVAN T.
Published: November 2004

The possibility of constructing a conformally invariant model of spinor quantum electrodynamics (QED) in four dimensions involving an anomalous dimension of the electron field and a general indecomposable conformal law for the Maxwell field Fµν is studied within the local indefinite metric framework making systematic use of conformal operator product expansions (OPEs). It is demonstrated that the standard elementary conformal law for Fµν, which is known to yield a vanishing current-current 2-point function leads to a trivial theory. On the other hand, the conformal invariant 2-point function  (proportional to the second order perturbation theory expression in a massless QED) gives rise to a soluble conformal model involving [Formula: see text] and a vector field Vµ with longitudinal correlation function. The question whether the model can be extended to include Fµν (rather than its divergence) remains unresolved.
AN ATTEMPT TO EXPLAIN THE SMALLNESS OF THE COSMOLOGICAL CONSTANT
Authors: SINGH T.P. , PADMANABHAN T.
Published: November 2004

Fields which couple directly to the cosmological constant (Λ) may provide a scenario for explaining the smallness of Λ at the present epoch. In this paper we postulate the existence of a scalar field which couples universally to the trace of energy—momentum tensor of matter. Various possibilities for the explicit form of the coupling function are considered. The field equations in such a theory are derived, and the cosmological models with such a scalar field are analyzed. The proposed coupling makes the effective cosmological constant a dynamically evolving quantity, which can be driven to zero by allowing the scalar field to grow to sufficiently large values. For the case of linear coupling, however, it does not seem to be possible to attain sufficient growth during the age of the universe (~1017 s ). A quadratic coupling to the trace can evolve Λ to a value consistent with today’s observations, but the universe is dominated by the scalar field, rather than by radiation, at late times. The evolution is singular for couplings through a higher power law, in that the scalar field blows up at a finite time. The model is not very sensitive to initial conditions and the problems encountered can be avoided only by a severe fine-tuning of the parameters in the basic theory.
CHARACTER FORMULAE AND THE STRUCTURE OF THE REPRESENTATIONS OF THE N=1, N=2 SUPERCONFORMAL ALGEBRAS
Authors: KIRITSIS ELIAS B.
Published: November 2004

The unitary representations of the N=1 and N=2 superconformal algebras are analyzed. The embedding structure of all the degenerate representations is studied. Character formulae are derived for the degenerate representations including those which [Formula: see text]. The relation between characters and the exact partition functions of 2-d critical statistical systems is explored. The [Formula: see text], N=2 superconformal system is analyzed from the group theoretic point of view and it is shown to be a subsector of the N=1, ĉ=2/3 theory.
MANIFOLD-SPLITTING REGULARIZATION, SELF-LINKING, TWISTING, WRITHING NUMBERS OF SPACE-TIME RIBBONS and POLYAKOV’S PROOF OF FERMI-BOSE TRANSMUTATIONS
Authors: TZE CHIA-HSIUNG
Published: November 2004

We present an alternative formulation of Polyakov’s regularization of Gauss’ integral formula for a single closed Feynman path. A key element in his proof of the D=3 fermi-bose transmutations induced by topological gauge fields, this regularization is linked here with the existence and properties of a nontrivial topological invariant for a closed space ribbon. This self-linking coefficient, an integer, is the sum of two differential characteristics of the ribbon, its twisting and writhing numbers. These invariants form the basis for a physical interpretation of our regularization. Their connection to Polyakov’s spinorization is discussed. We further generalize our construction to the self-linking, twisting and writhing of higher dimensional d=n (odd) submanifolds in D=(2n+1) space-time. Our comprehensive analysis intends to supplement Polyakov’s work as it identifies a natural path to its higher dimensional mathematical and physical generalizations. Combining the theorems of White on self-linking of manifolds and of Adams on nontrivial Hopf fibre bundles and the four composition-division algebras, we argue that besides Polyakov’s case where (d, D)=(1, 3) tied to complex numbers, the potentially interesting extensions are two chiral models with (d, D)=(3, 7) and (7, 15) uniquely linked to quaternions and octonions.

In Memoriam Richard P. Feynman
CAN THE MINIMAL SUSY EXTENSION OF THE STANDARD MODEL BE RULED OUT BY CHARGINO PRODUCTION AT e+e− COLLIDERS?
Authors: LEIKE A.
Published: November 2004

It is discussed how the parameters of gaugino mixing in the minimal supersymmetric extension of the Standard Model may be determined in future experiments, for example at LEP or SLC.

If charginos are produced at LEP the gaugino mixing parameters can be measured for the case that the sneutrinos are very heavy or for the case that at least one sneutrino is lighter than the light chargino and the ratio of the vacuum expectation values of the two Higgs doublets is closed to 1. In this cases the model could be ruled out.
CORRELATION FUNCTIONS OF σ FIELDS WITH VALUES IN A HYPERBOLIC SPACE
Authors: HABA Z.
Published: November 2004

It is shown that the functional integral for a σ field with values in the Poincare upper half-plane (and some other hyperbolic spaces) can be performed explicitly resulting in a conformal invariant noncanonical field theory in two dimensions.
SHIELDING IN THE CHIRAL SCHWINGER MODEL
Authors: BERGER T. , FALCK N. K. , KRAMER G.
Published: November 2004

Fermionic propagators and the Wilson loop of the gauge invariant chiral Schwinger model are compared with their counterparts in the Schwinger model. It is made evident that in the chiral Schwinger model the charges are also shielded as in the ordinary Schwinger model. Furthermore we show that the Schwinger model can be reformulated in such a way that it becomes the chiral Schwinger model endowed with a special regularization scheme.
ASTROPARTICLE PHYSICS (1988)
Authors: SALAM ABDUS
Published: November 2004

A review of the present situation in particle physics, astrophysics and cosmology is attempted, which emphasises the unity of the subject.
COVARIANT BASIC OPERATORS IN BOSONIC STRING THEORY
Authors: CRISTOFANO G. , NICODEMI F. , PETTORINO R.
Published: November 2004

We discuss the covariant formulation of basic one-loop operators for the bosonic string using BRST invariant 3-Reggeon Vertex and propagator. In particular we discuss their automorphic structure and we give the construction of the vacuum energy and the tadpole operator at two-loop level writing explicitly the integration measure.
EXTRACTING GLUON FRAGMENTATION FUNCTIONS IN HADRON-HADRON COLLISIONS
Authors: DU DONGSHENG , GE YUZHEN , LUO MA
Published: November 2004

Two methods for extracting gluon fragmentation functions in π±p, [Formula: see text] and pp collisions are proposed. The only inputs are valence-quark distribution functions which we know much better than other structure functions and fragmentation functions. So better extraction of gluon fragmentation functions can be obtained.
GENERALIZED CHOU-YANG MODEL AND MESON-PROTON ELASTIC SCATTERING AT HIGH ENERGIES
Authors: SALEEM MOHAMMAD , ALEEM FAZAL-E , RASHID HARIS
Published: November 2004

The various characteristics of meson-proton elastic scattering at high energies are explained by using the generalized Chou-Yang model which takes into consideration the anisotropic scattering of objects constituting pions(kaons) and protons. A new parametrization of the proton form factor consistent with the recent experimental data is proposed. It is then shown that all the data for meson-proton elastic scattering at 200 and 250 GeV/c are in agreement with theoretical computations. The physical picture of generalized Chou-Yang model which is based on multiple scattering theory is given in detail.
STRANGE STATISTICS, BRAID GROUP REPRESENTATIONS AND MULTIPOINT FUNCTIONS IN THE N-COMPONENT MODEL
Authors: LEE H. C. , GE M. L. , COUTURE M. , WU Y. S.
Published: November 2004

The statistics of fields in low dimensions is studied from the point of view of the braid group Bn of n strings. Explicit representations MR for the N-component model, N=2 to 5, are derived by solving the Yang-Baxter-like braid group relations for the statistical matrix R, which describes the transformation of the bilinear product of two N-component fields under the transposition of coordinates. When R2≠1 the statistics is neither Bose-Einstein nor Fermi-Dirac; it is strange. It is shown that for each N, the N+1 parameter family of solutions obtained is the most general one under a given set of constraints including “charge” conservation. Extended Nth order (N>2) Alexander-Conway relations for link polynomials are derived. They depend nonhomogeneously only on one of the N+1 parameters. The N=3 and 4 ones agree with those previously derived by Akutsu et al. Flat connections ω defining integrable systems of the N-component model are derived from the representations. The monodromy of the solution of such a system also carries a representation Mω of Pn⊂Bn. For N=2, Mω=MR, but the equality may not hold in general. The connections also lead directly to solutions of the classical Yang-Baxter equation. A generalization of Kohno’s monodromy representation of Bn associated with the algebra sl(N,C) is given. Applications of the braid group representations to statistical models, conformal field theory and many-body systems of extended objects are briefly discussed.
ANTIPROTON ANNIHILATION IN COMPLEX NUCLEI OF EMULSION AND ISOBAR MODEL OF PION ABSORPTION
Authors: CHAKRAVARTTY S.C.
Published: November 2004

Antiproton [Formula: see text], on annihilation with a nucleon in a complex nucleus of emulsion emits charged pions which are about 20% less than that observed in an antiproton annihilation on a free nucleon. Predominant reduction takes place for the pions in the energy range of 140 MeV. This reduction of charged pion multiplicity and the corresponding pion energy range for which such reduction takes place have been explained on the basis of isobar model of pion absorption. The energy and the opening angle distributions of the protons resulting from absorption of such pions were measured and were fitted with those from the Monte Carlo calculations based on the isobar model. Good agreement in each case further supports the isobar model of pion absorption. (Nuclear reaction ([Formula: see text], emulsion), pion absorption in complex nuclei, isobar model)
STOCHASTIC DYNAMICS OF SCALAR FIELD IN THE INFLATIONARY UNIVERSE
Authors: HOSOYA AKIO , MORIKAWA MASAHIRO , NAKAYAMA KEIJI
Published: November 2004

An effective dynamics of a long wavelength part of an inflation in de Sitter space is derived in the form of the Langevin equation by regarding the remaining short wavelength part as a noise. Classical properties of the noise and the long wavelength part are investigated and their statistical correlations are derived. The formulation is applied to the generation of density perturbations. Here the interaction in the Langevin equation is shown to be indispensable as far as we disregard the singular contribution of the energy-momentum tensor correlation.
QCD TESTS OF: G(1.6)=GLUEBALL
Authors: NARISON S. , VENEZIANO G.
Published: November 2004

QCD sum rules, low-energy theorems and current algebra for the pseudoscalar nonet are used to support the hypothesis that the recently observed G(1.6 GeV) meson is a (relatively pure) gluonium state.
SPIN STRUCTURES IN N=2 SUPER RIEMANN SURFACES OF GENUS 1
Authors: MYUNG Y.S.
Published: November 2004

We clarify the spin structures in N=2 Super Riemann Surfaces of Genus 1 (N=2 Supertorus).
WHAT BECOMES OF THE VACUUM ANGLE IN GENERALLY COVARIANT GAUGE THEORIES AND THE VIELBEIN APPROACH TO GRAVITY
Authors: BALACHANDRAN A.P. , JO S. , SRIVASTAVA A.M.
Published: November 2004

We examine the fate of the gauge theory vacuum angles (like the QCD θ) when the topology of the spatial slice M is nontrivial and diffeomorphism invariance is included. The analogues of the θ angles are then defined by the unitary irreducible representations of the semidirect product [Formula: see text] and [Formula: see text] being the groups of asymptotically trivial diffeomorphisms and gauge transformations for M. Features from spatial and gauge group topologies thus get nontrivially mixed up. As a consequence, a spectrum of θ angles or their appropriate analogues can occur in a quantum theory. We also find the remarkable result that the vacuum angles are quantized for certain M like ℝ2#T2. The new variable approach to gravity or any approach using vielbeins resembles a gauge theory with diffeomorphism invariance and hence can be subjected to our analysis. In particular, in such approaches as well as a spectrum of gravity θ angles or their suitable analogues can appear in a quantum theory.
ISOMORPHIC REPRESENTATIONS OF ANOMALOUS CHIRAL GAUGE THEORIES
Authors: GIROTTI H.O. , ROTHE K.D.
Published: November 2004

Anomalous chiral gauge theories allow for gauge invariant and gauge noninvariant descriptions. We show that these are isomorphic and use this result to comment on misinterpretations of some aspects of the chiral Schwinger model. We also use this model to demonstrate how the isomorphism emerges within the Hamiltonian formalism.
DERIVATION OF ANOMALIES USING THE ITÔ STOCHASTIC CALCULUS
Authors: PICKEN R.F. , WEBB J.N.
Published: November 2004

Itô’s stochastic calculus is used to derive a number of anomalous Ward identities. The general features of the method are described and similarities with Fujikawa’s path integral approach are pointed out. The stochastic calculus provides an easily understood origin for anomalies within the framework of the stochastic quantization scheme.
SUPERSPACE CONSTRAINTS AND CHERN-SIMONS COHOMOLOGY IN D=4 SUPERSTRING EFFECTIVE THEORIES
Authors: D’AURIA RICCARDO , FRE’ PIETRO , DE MATTEIS GUIDO , PESANDO IGOR
Published: November 2004

The linear multiplet, composed of the dilaton ϕ, of an antisymmetric gauge field Bμν and of a spinor χ is always present in any superstring induced N=1D=4 supergravity model. We consider its coupling to supergravity using only superspace Bianchi identities and the rheonomy approach. In this way, our results are fully general and independent from the choice of any Lagrangian, a concept which is never mentioned in this paper. We consider two situations corresponding to two different free differential algebras: (1) the case where there are no Chern-Simons terms in the Bμν field strength Hμνρ and (2) the case where such terms are included in Hμνρ. Case (2) is obviously the one chosen by string theory on the ground of anomaly cancellation. In both cases, we must solve the H-Bianchi identity using a solution of the super Poincare’ Bianchi identities as a background. Such a solution, besides the physical fields displays a certain number of auxiliary fields. The most general solution of the super Poincare’ Bianchis we have to consider corresponds to 16⊕16 off-shell multiplet which, by suitable choices can be reduced either to the so-called old minimal or to the new minimal 12⊕12 multiplet. We give the general solution of the H-Bianchi within the 16⊕16 formulation both with and without Chern-Simons terms. This is done through the D=4 analogue of Bonora-Pasti-Tonin theorem of the 10D anomaly free supergravity. By specializing our parameters, we obtain the form of the coupling in the new minimal model retrieving in this case the results of Cecotti, Ferrara and Villasante. In addition we clarify the geometrical meaning of R-symmetry showing that in the absence of Chern-Simons forms, the condition for the embedding of the linear multiplet into the Kaehler manifold [Formula: see text] spanned by the chiral multiplets (existence on [Formula: see text] of a U(1) Killing vector) is the same condition which guarantees the existence of a local Weyl transformation by means of which the 16⊕16 curvatures can be reduced to the new minimal form and the scalar complex scalar auxiliary field S can be set to zero. Finally, we discuss the arbitrariness contained in the solution of the H-Bianchi identities at the level of the (0, 3) superspace sector. We derive the D=4 analogue of the superspace cocycle which is responsible for the Grisaru-Zanon R4-terms in the D=10 case.
BOSONIC PATH INTEGRALS FOR FOUR-DIMENSIONAL DIRAC PARTICLES
Authors: ORLAND PETER
Published: November 2004

After reviewing coherent state path integrals for nonrelativistic spin in four dimensions (or equivalently, relativistic spin in three dimensions), the Dirac propagator in four dimensions is recast as a functional integral of an (S3×S3)/S1 field. Chiral transformations correspond to a global rotation of this field.
ON THE PROJECTILE MASS DEPENDENCE OF AZIMUTHAL CORRELATIONS IN INTERACTIONS WITH EMULSION TARGET NUCLEI
Authors: BADYAL S. K. , BHASIN A. , GUPTA V. K. , KITROO S. , KOHLI J. , MANGOTRA L. K. , RAO N. K. , SANKHYADHAR S. , KUMAR V. , MITTRA I. S. , BHATIA V. S. , BERI S. , KAUR M. , ARORA R. , BHALLA K. B. , KUMAR V. , LOKANATHAN S. , MOOKERJEE S. , RANIWALA R. , RANIWALA S. , GARPMAN S. , OTTERLUND I. , PERSSON S. , SÖDERSTRÖM K.
Published: November 2004

We have observed strong two-particle azimuthal correlations in different groups of charged particles in Kr-Em interactions at 1.4 A GeV . We also found a systematic growth of correlation with the increase of projectile mass and also with respect to participating target mass. The parameters studied are the asymmetry coefficients (A and <α>) and intergroup correlation parameter <Φij>. The colinearity coefficients (B and <β>) were also studied but no statistically significant signal, except for Z = 2 (He) fragments from the projectile was found.
A LIE GROUP FRAMEWORK FOR COMPOSITE PARTICLES AND HARMONIC OSCILLATOR MASS SPECTRUM
Authors: BANDYOPADHYAY PRATUL
Published: November 2004

A harmonic oscillator mass spectrum is developed through a relativistic covariant method in unifying the external and internal variables of a hadron leading to a dynamical Lie algebra. It is shown that through the introduction of an internal variable ξμ, which behaves as a 'direction vector', attached to each space-time point, χμ, and the spatial extension, Xi, of the composite system, we can uniquely determine a harmonic oscillator mass spectrum. This is valid even when the constituents are taken to be massless. Moreover, when these internal variables are associated with the internal symmetry, the mass splitting due to the internal symmetry breaking is incorporated in this formalism and no adhoc consideration is necessary. The mass spectrum of the neutral isovector and isoscalar mesons is computed in this framework.
ROLE OF GLUONS IN THE DYNAMICAL ORIGIN OF THE PROTON SPIN
Authors: CELENZA L. S. , PANTZIRIS A. , SHAKIN C. M. , WANG HUI-WEN
Published: November 2004

We consider the relation of dressed (or constituent) quarks to bare quarks within a specific model. In this model the bare quark obtains a dynamical mass and is nonpropagating because of its interaction with a gluon condensate. Using this model, we show that a significant part of the spin of the nucleon may be carried by the gluon field. This result may aid in explaining the recent EMC (European Muon Collaboration) data which suggests that the bare quarks carry only a fraction of the proton spin.
SPONTANEOUS SUPERSYMMETRY BREAKING AND EFFECTIVE ACTION IN SUPERSYMMETRICAL KALUZA-KLEIN THEORIES AND STRINGS
Authors: BUCHBINDER I. L. , ODINTSOV S. D.
Published: November 2004

The one-loop effective action (EA) for arbitrary supersymmetric theory with broken supersymmetry on the background Rb × Td−n, where Rn, Td are n-dimensional curved space-time and d-dimensional torus, is obtained. Vilcovisky-De Witt EA in d = 5 (super)gravity on the background R4 × T1 at nonzero temperature is calculated with accuracy to linear curvature terms. Vacuum energy for open and closed superstrings with broken supersymmetry on the background M4 × T6, where M4 is Minkowski space, is also obtained. The question of the possibility of spontaneous compactification in models under consideration is analyzed.
KÄHLER SIGMA MODELS FROM SUPERSYMMETRIC GAUGE THEORIES
Authors: KOTCHEFF A. C. W. , SHORE G. M.
Published: November 2004

The geometrical structure of the noncompact, nonhomogeneous Kähler sigma models arising from supersymmetric gauge theories is described. Topics discussed include the choice of target manifold for the sigma model, the supersymmetric vacuum alignment problem and the nature of chiral symmetry breaking, the role of isometry anomalies, the construction of the Kähler potential and metric, and the embedding of the conventional compact coset space sigma model in the supersymmetric Kähler model.
FOUR-DIMENSIONAL HETEROTIC STRING MODELS WITH SU(3) × SU(2) × Up(1) LOW ENERGY GAUGE GROUP
Authors: BAILIN DAVID , LOVE ALEX
Published: November 2004

A study is made of a class of four-dimensional heterotic string models with complex fermionic degrees of freedom to discover whether there are any examples with 3 or 4 generations of quarks and leptons and SU C(3) × SU L(2) × U p(1) low energy gauge group.
NEW NEUTRAL GAUGE BOSONS AT HIGH ENERGY e+e− COLLIDERS
Authors: HEWETT JOANNE L. , RIZZO THOMAS G.
Published: November 2004

We discuss and contrast search limits for and properties of new Z′ gauge bosons which can be probed at high energy e+e− colliders within the context of several E6 superstring-inspired models. In particular, we discuss the probability of distinguishing these various models from one another and determining the Z′ coupling parameters uniquely. Using the deviations from the standard model predictions for asymmetries and cross sections for various final state fermions, we set discovery limits for new Z′ bosons at [Formula: see text] and 1 TeV e+e− colliders. We find quite generally that cross section deviations provide the strongest limits on the existence of new Z′ bosons below threshold even when 100% beam polarization is available. The possibility of using Z′ pair production as a sensitive probe of the e+e−Z′ coupling is also examined.
CAUSTICS IN A CUBIC SU(2) LATTICE MODEL WITH ANTIPERIODIC BOUNDARY CONDITIONS
Authors: RAABE B.
Published: November 2004

In order to investigate the weak coupling limit of lattice gauge theories, it has been suggested recently to apply the semiclassical approximation to the Schrödinger equation in the Hamiltonian formalism. This method is used to study pure SU(2) gauge theory on a cube with sides of length one lattice constant and with antiperiodic boundary conditions. We show the existence of caustics, i.e. envelopes of families of classical trajectories where the ground state wave function peaks, and describe their shape.
ON THE REPRESENTATION INDEPENDENCE OF TOPOLOGICAL EFFECTS IN QUANTUM FIELD THEORY
Authors: BLAU MATTHIAS
Published: November 2004

The formal representation-independence of topological effects in quantum field theory like those associated with monopole line bundles on the configuration space or vacuum angles is established within the framework of geometric quantization by studying simple finite-dimensional examples. Some deficiencies of the ordinary momentum representation are pointed out and an alternative generalization of the momentum representation to homogeneous spaces is suggested.
QUANTUM MECHANICS WITH p-ADIC NUMBERS
Authors: MEURICE YANNICK
Published: November 2004

We discuss unitary realizations of the Heisenberg group and the linear canonical transformations over a complex Hilbert space but with dynamical variables on a p-adic field Qp. For all p, an appropriate choice of phase turns the realization of the linear canonical transformation into a representation up to a sign of SL (2, Qp). We give the spectra of the subgroups corresponding to the free particle and the harmonic oscillator. We discuss briefly the possibility of an adelic interpretation.
A COMPARISON OF THE PATH-INTEGRAL AND THE OSCILLATOR APPROACH TO COVARIANT LOOP CALCULUS
Authors: ROLAND K.
Published: November 2004

We consider the construction of the N-string g-loop vertex for the bosonic string. The sewing procedure of Ref. 1, based on path integrals, is reformulated in terms of operators. This makes it trivial to demonstrate complete equivalence with the oscillator approach of Refs. 2, 3, and 4. Also, the equivalence of two very different loop-sewing procedures for the g-loop vacuum diagram can be demonstrated, this being a very strong indication that the formalism is completely independent of the sewing procedure even in the case of loops.
THE MICRO-REGION COMPOSITIONAL VARIATION OF Y1Ba2Cu3O9−x SINGLE PHASE SUPERCONDUCTOR
Authors: Mai Zhenhong , Chen Liquan , Chu Xi , Dai Daoyang , Ni Yongming , Huang Yuzhen , Xiao Zhili , Ge Peiwen , Zhao Zhongxian
Published: November 2004

We have investigated the microstructure and compositional distribution of the Y 1 Ba 2 Cu 3 O 9−x single phase superconductor with scanning electron microscopy, energy dispersion x-ray spectrometry and x-ray diffraction. It has been found that the micro-region compositions are far front the ideal values, especially the yttrium content is quite higher than the suspected amount in the interfacial region. between crystalline grains. We propose that there might be another structural phase co-existed with the Y 1 Ba 2 Cu 3 O 9−x compound and it can not be distinguished from the main phase with diffraction methods. This phase would influence the properties, in particular the critical current density jc of the new superconductor.
SOME FACTORS EFFECT ON ZERO-RESISTANCE TEMPERATURE OF SUPERCONDUCTR Y1Ba2Cu3O9−x
Authors: Chen Liquan , Xiao Zhili , Huang Yuzhen , Mai Zhenhong , Chu Xi , Dai Daoyang , Zhao Zhongxian , Chen Genhua , Ni Yongming , Bi Jianqing , Wang Lianzhong , Wang Changqing
Published: November 2004

Some factors which might effect on Tco during the sintering procedure have been studied. These factors include the sintering time, sintering temperature, heating rate, cooling rate, oxygen pressure, annealing in different atmosphere and multiple sintering as well. The attention has also paid to the influence of Al3+ which might be introduced by using Al2O3 crucible.
DETERMINATION OF OXYGEN NON-STOLCHIOMETRIC FRACTION, δ, IN SINGLE-PHASE SUPERCONDUCTING YBa2Cu3Om+δ
Authors: Ji Chunlin , Cui Chuanmeng , Liu Sulan , Wang Kuihan , Fan Zhanguo , Zhang Guofan
Published: November 2004

The hydrogen/carbon mono-oxide reduction method, based on the difference in thermodynamic stability of yttrium oxide, barium oxide and copper oxide, has been used to determine the oxygen non-stoichiometric fraction, the δ value, in single-phase superconducting YBa2Cu3O6.5+δ . The δ value was found to +0.27 for samples produced by directed reaction process under the given conditions. The present authors regard YBa2Cu3O6.77 as a copper-deficient non-stoichiometric compound.
PHONON BEHAVIOR OF Y-Ba-Cu-O SUPERCONDUCTOR AND SEMICONDUCTOR
Authors: Ruan Jinghui , Li Jizhou , Yu Ansun , Gan Shu , Yang Tonghua , Lin Jun , Niu Shiwen , Gou Cheng , Ye Chuntang , Liu Zhenyi , Zheng Xiangmiao , Lin Bingxiong , Chuanyi Li , Wei Chongde
Published: November 2004

The generalized phonon density of states of Y-Ba-Cu-O superconductor and semiconductor has been measured by neutron inelastic scattering method. The results show that the decrease or disappearance of high frequency modes and the increase of low frequency modes may have some relations to the high superconducting transition temperature
ENERGY GAP OF HIGH-Tc SUPERCONDUCTOR YBa2Cu3O9−δ
Authors: Hong-juan Ye , Wei Lu , Zhi-yi Yu , Xue-chu Shen , Bai-cai Miao , Yi-ming Cai , Yong-jia Qian
Published: November 2004

The far infrared reflectances of the high-Tc superconductor YBa2Cu3O9−δ(Tc=90k) are measured in the frequency range 25–150 cm−1 and the temperature range 42k-200k. The reflectance curve with 42k rapidly drops near 125 cm−1, whereas the curves with T>90k go smoothly. It indicates such superconductors have a energy gap 2Δ=15.5 mev, and the ratio 2Δ/kTc=2.0 is close to that of superconductors La-Ba-Cu-O and La-Sr-Cu-O, but well smaller than the BCS value 3.5.
ULTRASONIC STUDY OF HIGH Tc SUPERCONDUCTING SYSTEM
Authors: He Yusheng , Zhang Baiwen , Lin Sihan , Xiang Jiong , Lou Yongming , Chen Haoming
Published: November 2004

Ultrasonic measurements indicated that there are two structural first order-like phase transitions in the high Tc Ba-Y-Cu-Nb-O system. One is near 200K, the other is right above Tc. It is suggested the heavily suppressed pre-superconducting transition, which provides lattice instability and the soft phonon modes, gives rise to the high Tc.