bluuebunny/crossref_metadata_2025 huggingface dataset:
LINEAR GRAVITONS FROM STRINGS
Authors: TRASCHEN JENNIE H.
Published: November 2004

Linear gravitons and spin-two gauge invariance appear in several places in string theories. The purpose of this note is to clarify the connection between gravitons which are emitted by vertex operators in conformal field theories and those which appear in conformally invariant sigma models, and to compare the associated gauge invariances. The polarization tensor and scalar field of a graviton-dilaton vertex are shown to obey equations of motion which are identical to the sigma model equations of motion if, and only if, the trace of the polarization tensor is massless. The gauge invariance of this vertex is a restricted version of the normal spin-two gauge invariance, but is seen to be sufficient to imply conservation of spacetime stress energy of the string.
BETHE-SALPETER EQUATION FOR A FOUR FERMION SYSTEM I
Authors: KIM S.K. , MÜLLER B. , GREINER W.
Published: November 2004

We derive the Bethe-Salpeter equation for bound states of a four-body system. We treat only two-body interaction kernels in the ladder approximation. Our equations should be applicable for the description of exotic meson states ([Formula: see text] states) and the “polypositronium” states discussed in connection with the interpretation of the narrow coincidence peaks in the spectra of electrons and positrons observed in heavy ion collisions.
HIGGS SECTOR CORRECTIONS TO THE ρ-PARAMETER IN THE TREE BREAKING SUPERGRAVITY MODELS
Authors: CHEN C.C. , KIKUCHI Y.
Published: November 2004

One-loop corrections to the ρ-parameter in supergravity models with large Yukawa coupling (i.e. in the limit of large Higgs mass) is calculated. It is found that the contributions from the Higgs sector cancel, hence no new constraints are obtained on the Higgs masses.
AN APPROXIMATE METHOD TREATING A THREE BODY FORCE IN THE (d, p) REACTION
Authors: HASHIMOTO NAOKI
Published: November 2004

We propose a very simple method to calculate the (d, p) reaction including a three body force, and discuss briefly the non-integrable phase factor like Berry’s phase associated to the three body force.
DYNAMICAL SU(m)-SYMMETRIC AND SU(m/n)-SUPERSYMMETRIC LIMITS OF THE QUASIPARTICLE-PHONON NUCLEAR MODEL
Authors: DANG NGUYEN DINH
Published: November 2004

It is shown that under some conditions the operators of the Quasiparticle Phonon Nuclear Model (QPM) and their commutators close the SU (m) algebra and the graded SU (m/n) algebra, respectively, for even-even and odd-even nuclei. The SU (m/n) generators and their matrix representation are then derived from the QPM operators. The generalized Dyson realization for the QPM operators is obtained. Microscopic expressions for the parameters of the IBM-1 and IBFM-1 Hamiltonians are derived.
ON THE BASIS OF U(15/30) SUPERSYMMETRY
Authors: YU ZU-RONG
Published: November 2004

In this short note, we have given a method for constructing the basis of the SU(3) limit of U(15/30) and of calculation of Hamiltonian matrix elements.
A REMARK ON THE CONNECTION BETWEEN THE C-THEOREM AND THE CENTRAL CHARGE ACTION IN CLOSED BOSONIC σ-MODELS
Authors: MAVROMATOS N.E.
Published: November 2004

In the case of closed bosonic σ-models propagating in massless backgrounds (at tree level in the world-sheet), there exists a real scalar function (in coupling constant space) whose variations are associated with the Weyl anomaly coefficients as a consequence of Zamolodchikov’s c-theorem. In this note, we prove that this function is related to the central charge action via a local field redefinition of the corresponding couplings. Modulo the equivalence conjecture, according to which the generating functional of the S-matrix of the central charge action and of the corresponding string theory (for massless tree level emissions) coincide, we thus represent the string effective action as an object in σ-model theory.
THE EMC EFFECT AND THE PAULI EXCLUSION PRINCIPLE
Authors: BOUVY M. , PESTIEAU J.
Published: November 2004

We propose that the Pauli exclusion principle applied to nucleons and quarks in heavy nuclei, be the basic ingredient necessary to understand the EMC effect in deep inelastic leptoproduction from heavy nuclei.
PHASE DIAGRAM OF U(1) LATTICE MIXED MODEL IN ANALYTIC TREATMENT
Authors: QI DE-WEI , ZHENG XI-TE
Published: November 2004

The phase diagrams of U(1) mixed model in the lattice gauge theory in four and five dimensions are studied by the variational-cumulant expansion method. The obtained phase diagrams in the first octangle of β–γ plane are in good agreement with the Monte Carlo results. The phase transition separating the confinement phase and the spin-wave (QED) phase is of first order.
THE NARROW U(3.1) STATE: EVIDENCE FOR COLOR (6,6*) DIQUONIUM $\left( {sq\bar q^2 } \right)$?
Authors: ONO SEIJI , FURUI SADATAKA , MITRA A.N.
Published: November 2004

We show that the decay of a certain kind of the diquonium is severely restricted for various reasons. We conclude that the narrow U(3.1) is a good candidate for the diquonium [Formula: see text].
INFLUENCE OF EARTH’S GRAVITY ON (g−2) MEASUREMENTS
Authors: WIDOM A. , CHEN C.C.
Published: November 2004

Experimental probes of the anomalous magnetic moment of the muon, which are sufficiently sensitive to probe electro-weak unification contributions to (g−2), are also sufficiently sensitive to test an interesting feature of general relativity. The gravitational field of the earth produces a background space-time metric which will influence (g−2) measurements.
LOSS OF QUANTUM COHERENCE DUE TO TOPOLOGICAL CHANGES: A TOY MODEL
Authors: LAVRELASHVILI G.V. , RUBAKOV V.A. , TINYAKOV P.G.
Published: November 2004

We present a toy model for the third quantization theory of topological changes. We find that the natural choice of the “Heisenberg” state vector of the system with one large universe and an arbitrary number of small universes gives rise to the loss of quantum coherence.
A BCS QUARK MASS MATRIX
Authors: KAUS PETER , MESHKOV SYDNEY
Published: November 2004

The quark mass gap and quark mass hierarchy is obtained by introducing a BCS interaction among ur-quarks. A 3×3 quark mass matrix with equal matrix elements, i.e., with all ur-flavors interacting with the same strength, has eigenvalues 0, 0 and 3; both the quark charge −1/3 and charge +2/3 systems with one heavy quark and two almost massless quarks resemble these eigenvalues. The physical mass splittings between the two lightest quarks come from higher-order corrections to the mass matrix which are obtained by fitting the Kobayashi-Maskawa matrix VKM.
CRANKING THE CHIRAL SOLITON BAG MODEL: QUANTUM CORRECTIONS
Authors: CLEMENT GÉRARD , STERN JACQUELINE
Published: November 2004

The generation of physical states from mean field hedgehogs by cranking is extended to coherent hedgehogs, thus improving the agreement between the cranking and coherent state projection methods, and enabling us to correct simultaneously for translational and rotational fluctuations. These corrections lead to a drastic reduction in the mean nucleon-delta mass which, for the physical values of mπ and Fπ, is lower than, or approximately equal to, the experimental value.
CRANKING THE CHIRAL SOLITON BAG MODEL: GLUONIC EFFECTS
Authors: STERN JACQUELINE , BOURENANE MOHAMED , CLÉMENT GÉRARD
Published: November 2004

The nucleon-delta mass difference is computed in the chiral soliton bag model with soft confinement of gluons by the cranking method. The resulting value of the effective strong fine structure constant is αs≃0.7.
INDICATION OF TWO TEMPERATURES AND THEIR CORRELATION WITH ANOMALOUS INTERACTION MEAN FREE PATH OF Z=2 PROJECTILE FRAGMENTS IN 12C-EMULSION INTERACTION
Authors: GHOSH DIPAK , ROY JAYA , SENGUPTA RANJAN
Published: November 2004

This paper presents an experimental investigation of the occurrence of two distinct temperatures in the fragmentation region of 12C-emulsion interaction at 4.5 A GeV/c. It is observed that the projectile fragments of Z=2 are emitted from two different temperatures, that is, 10 MeV and 40 MeV. Moreover, it is also observed that the alpha particles emitted from the 10 MeV region has some (5%) anomalous components in their mean free paths.
SUBTHRESHOLD MULTIPLE PION PRODUCTION IN NUCLEUS-NUCLEUS COLLISIONS
Authors: FRIEDLANDER E.M. , NAVARRA F.S. , WEINER R.M.
Published: November 2004

With the intermediate energy heavy ion accelerators which will begin operation soon, multiple subthreshold pion production will become more feasible. We derive within a geometrical model the distribution function of available energy for particle production of secondaries and calculate the ratio between the probability of double and single pion production in subthreshold processes. This quantity is model dependent and its measurement could thus help in discriminating between different models.
CHARMONIUM STATES WITH L≠0
Authors: BORUE V. YU , KHOKHLACHEV S.B.
Published: November 2004

The theory of L≠0 charmonium levels is developed within the framework of QCD. The main feature of our consideration is that the quarks are separated by sufficiently large distances and the major contribution to the interquark interaction comes from the gluonic string.
VARIATIONAL SOLUTION OF THE LOOP EQUATION IN QCD
Authors: AGISHTEIN M.E. , MIGDAL A.A.
Published: November 2004

A new technique for the large N loop equation of QCD is worked out. The Wilson loop W(C) is approximated by a Gaussian functional. The parameters are fitted to the loop equation, after which the equation is satisfied up to 0.2 %. The resulting Wilson loop corresponds to linearly rising Regge trajectories. The problem of tachyon is still present, but it could be cured by iteration of the loop equation starting from this variational solution.
CHIRALLY GAUGED WESS-ZUMINO-WITTEN MODEL AS A CONSTRAINED SYSTEM
Authors: FUJIWARA TAKANORI , HOSONO SHINOBU , KITAKADO SHINSAKU
Published: November 2004

With the intention of finding a consistent Hamiltonian description of the anomalous nonabelian gauge theories in four dimensions, we examine algebraic properties of the Gauss-law constraints for the chirally gauged nonlinear σ-model with a Wess-Zumino-Witten term. A relation which, in the Weyl gauge, reduces to Fujikawa’s relation ∂0Ga(x) =i(DµJμ)a (x), is verified. Finally we attempt to quantize the system at the tree level by explicitly calculating the Dirac brackets.
PARTICLE MECHANICS IN HARMONIC SUPERSPACE
Authors: AKULOV V.P. , SOROKIN D.P. , BANDOS I.A.
Published: November 2004

A harmonic N=2 superparticle action containing one-dimensional CP 1 σ-model action with the Wess-Zumino term is proposed. Hamiltonian mechanics is formulated and quantized by the use of the Gupta-Bleuler method. The spectrum of quantum states of a harmonic N=2 superparticle is shown to contain N=2 matter hypermultiplets, and also the field strength of the Abelian gauge supermultiplet in the massless case. The existence of gauge and supergravity multiplets in the quantum spectra of harmonic N≥3 superparticles is also discussed.
NON-STANDARD HIGGS BOSON AND THE DECAY KL→π0l+l−
Authors: DOBROLIUBOV M.I. , IGNATIEV A. YU.
Published: November 2004

We investigate various mechanisms of enhancement of the branching ratios of the decay KL→π0l+l− as compared to the predictions of the Standard Model. We propose a model with several Higgs doublets, which contains a Higgs boson with nearly equal couplings to e+e− and µ+µ− pairs. In this model, the branching ratio BR (KL→π0e+e−, π0µ+µ−) can be close to the present experimental upper bounds.
SYMMETRIES OF THE HUBBARD MODEL AND THE θ TERM IN THE σ-MODEL
Authors: BALACHANDRAN A.P. , BOWICK M.J. , GUPTA K.S. , SRIVASTAVA A.M.
Published: November 2004

Recently, it has been shown that the strong coupling limit of the half-filled Hubbard model has SU(2) gauge invariance. The 2+1-dimensional nonlinear a model with the customary θ term does not have this symmetry — instead it has a U(1) gauge symmetry. A modification of the θ term is suggested so that the model acquires SU(2) — or rather SO(3) —gauge symmetry. The symmetries of this modified model thus resemble more closely those of the strongly coupled half-filled Hubbard model. Gauge invariance of the new model, unlike that of the U(1) model, requires quantization of the angle θ. The allowed θ values are mπ/2 ( mod 2π) with m an integer. Hence the allowed soliton spins are m/4 (m∈Z) while their statistics are governed by their spins in the usual way.
BOSE-EINSTEIN CORRELATIONS OF POSITIVE PIONS IN COLLISIONS OF Nb+Nb AND Au+Au AT 650 A MeV
Authors: BOCK R. , CLAESSON G. , DOSS K.G.R. , GUSTAFSSON H.-Å. , GUTBROD H.H. , KAMPERT K.-H. , KOLB B. , KRISTIANSSON P. , LÖHNER H. , RITTER H.G. , SCHMIDT H.R. , SIEMIARCZUK T. , WIEMAN H. , WISLICKI W.
Published: November 2004

Two-pion interferometry analysis of the Plastic Ball data for Au+Au and Nb+Nb interactions at 650 A MeV kinetic energy is presented. The values of 3.4±0.4 fm and 4.8±0.6 fm for pion source sizes and 3.6±0.8 fm /c and 5.7±0.7 fm /c for lifetimes are obtained for the Nb+Nb and Au+Au cases, respectively. No significant change in radius as a function of multiplicity has been observed. However, the selection of π+ with low momenta in the center of mass system reveals an enlarged radius for the Au+Au system but no such increase for Nb+Nb .
RENORMALIZATION GROUP FLOW AND OPEN STRING DYNAMICS
Authors: NAKAZAWA NAOHITO , SAKAI KENJI , SODA JIRO
Published: November 2004

The renormalization group flow in the nonlinear sigma model approach is explicitly solved to the fourth order in the case of an open string propagating in the tachyon background. Using a regularization different from the original one used by Klebanov and Susskind (K-S), we show that its fixed point solution produces the tree-level 5-point tachyon amplitude. Furthermore we prove K-S’s conjecture, i.e., the equivalence between the vanishing β-function defined by our regularization and the equation of motion arising from the effective action, up to all orders.
PERTURBATIVE QCD CALCULATION OF 1−− (MESON) →γ1++ (MESON)
Authors: HE X.G. , HUANG C.S. , TUAN S.F.
Published: November 2004

A perturbative QCD calculation of 1−− (meson) → γ1++ (meson) is carried out. The predicted branching ratio of J/ψ→γ1++ is of the order (≈10−5). If ideal mixing between f1 (1285) and f1 (1420) is assumed, we predict Br (J/ψ→γf1 (1285)) to be 6×10−6 which is consistent with the experimental upper bound (≤6×10−3). Further improved experimental measurements will provide tests for perturbative QCD.
DIRAC NEUTRINO MASSES AS TWO-LOOP RADIATIVE CORRECTIONS
Authors: BABU K. S. , HE X-G.
Published: November 2004

We present a left-right symmetric model in which small and finite Dirac neutrino masses are generated as two-loop radiative corrections. Typical masses of the order 10−2 eV , 1 eV and 102 eV are obtained for νe, νμ and ντ, respectively. The model also features a generalized seesaw mechanism for the charged fermions which is achieved by the inclusion of heavy charged singlet fermions.
DECONFINEMENT TEMPERATURES FOR SMOOTH STRINGS
Authors: ZHOU XIAOAN , VISWANATHAN K. S.
Published: November 2004

Deconfinement temperatures for smooth strings are obtained by analyzing the free energy of a collection of smooth string excitations. This corresponds to evaluating path integrals on genus one Riemann surfaces. We find that [Formula: see text], where σ is the string tension, for closed smooth strings and [Formula: see text] for open smooth strings, in reasonable agreement with Monte Carlo data for SU(3) lattice gauge theories.
QUANTUM PROPERTIES OF QCD STRING AND HEAVY QUARKONIA SPECTROSCOPY
Authors: BYKOV A. A. , LEONIDOV A. V. , MIRONOV A. D.
Published: November 2004

The situation with quantum corrections to large-R behavior of potential induced by the string is considered theoretically as well as experimentally. The sensitivity of the heavy quarkonia spectroscopy to this corrections is discussed. We obtain the restrictions on possible value of the central charge of the Virasoro algebra, which is conjectured to correspond to QCD string.
TEST OF THE UNACTIVATED CALCIUM FLUORIDE CRYSTAL FOR USE AS A SCINTILLATION DETECTOR IN Ca48 DOUBLE BETA DECAY EXPERIMENT
Authors: TIAN WEIHUA , YOU KE , ZHU YUCAN , ZHAO WENHENG , ZHENG ZHIPENG , LU JUNGUANG , SUN HANSHENG , YE MINGHAN , FU YANFENG , OU SHAOXIN , FANG JIANWU , GUO HONGTAO
Published: November 2004

The test results of the properties of the unactivated CaF 2 scintillation crystal detector is reported. The energy response of a small size CaF 2 crystal and a large CaF 2 crystal detector, which will be used in the Ca 48 Double Beta Decay (DBD) experiment, to gamma rays and an electron beam from 6 to 10 MeV was tested. The results indicate that the linear energy response range can be extended to 10 MeV for the large CaF 2 detector. Meanwhile, the relation of the energy resolution to the incident particle energy is represented by E−1/2 (MeV) . (It is anticipated that the energy resolution at 4.27 MeV will be about 9%.)
ENERGY LOSS FROM THE SUN AND RED GIANTS: BOUNDS ON SHORT-RANGE BARYONIC AND LEPTONIC FORCES
Authors: GRIFOLS J. A. , MASSÓ E. , PERIS S.
Published: November 2004

Laboratory, geophysical and astronomical data can place severe limits on forces weaker than gravity whose ranges typically go from ~ 1 cm up to astronomical distances. Forces strictly microscopic, however, lie beyond reach of Cavendish-type and geophysical experiments as well as astronomical observations. By computing the stellar energy loss caused by new hypothetical forces coupled to baryon and/or lepton charges and by demanding that this energy drain does not upset current stellar evolutionary models, we put restrictions on forces with a range larger than or ~ 1 Å.
EQUATION OF STATE OF VERY HOT NUCLEI BEFORE BREAK-UP
Authors: ZHANG DONG , ZHANG XIAO-ZE , JIN XING-NAN , SA BEN-HAO
Published: November 2004

The equation of state of very hot nuclei before break-up is investigated numerically by using a statistical model. The isotherms are drawn in the plane of generalized pressure P vs. freeze-out volume VRT. The critical temperature T c of a new kind of phase transition is estimated from the critical isotherm with a vanishing slope and an inflection point, to be nearly equal to 5 MeV.
NEUTRINO MASS HIERARCHY IN SU(2)L × U(1)Y TWO HIGGS SINGLETS INVISIBLE AXION MODELS
Authors: GENG C. Q. , NG JOHN N.
Published: November 2004

We study the neutrino mass hierarchy in invisible axion models employing two SU (2)L × U (1)Y Higgs singlets. The experimental and cosmological bounds on the neutrinos and axion masses are incorporated. We find that models with generation-blind Peccei-Quinn transformations have the same neutrino mass hierarchy as the minimal one singlet Higgs invisible axion models. On the other hand, models constructed by assigning different U (1) PQ charges to the neutrinos of different families can give unusual neutrino mass hierarchy. Especially, νe may have a mass in the eV range which is phenomenologically interesting.
ON N = 3, SO(3) SUPERMODULAR TRANSFORMATION ON SUPERTORUS
Authors: MYUNG Y. S.
Published: November 2004

We discuss N = 3, SO(3) supermodular transformation on supertorus. For the θ = ϕ = ψ = 0 and εi = ε case, we obtain the supermodular transformation. We also derive the Green function on supertorus for this case.
ON GENERAL 'SPIN' CONNECTIONS, GRAVITATION AND ELECTRODYNAMICS
Authors: LOHIYA DAKSH
Published: November 2004

It is known that intrinsic spin-vector-field analysis on a manifold provides as beautiful a description of the underlying geometry as does the description in terms of "world-vectors" defined on the manifold. However, requiring that a spinor connection be compatible with a corresponding 4-vector connection still leaves enough additional structure in the former to incorporate a gauge field. The resulting spin-curvature tensor is related to the Riemann tensor as well as an "electromagnetic field tensor" so definable. We advocate that the most general linear combination of dimensionally extended "Euler characteristics", constructed out of the generalized spin-curvature two form, be considered as a candidate for a lagrangian. It turns out to be a "natural" way to construct a unified framework for studying gravitation and electromagnetism. The consistency of the theory signals a rich structure that the underlying manifold must possess. We develop arguments to suggest that the electromagnetic field cannot be associated with amplitude transformation of the local tangent spin space but rather is consistent with the phase transformations.
COLEMAN’S MECHANISM FOR THE VANISHING OF THE COSMOLOGICAL CONSTANT IN THE AXION WORMHOLE MODEL
Authors: SHIMIZU KATSUTARO , WADA SUMIO
Published: November 2004

We apply Coleman’s argument for the vanishing of the cosmological constant to the wormhole model of Giddings and Strominger in the axion-gravity system. The axion potential turns out to be constant and its value is such that it makes the total cosmological constant vanish.
ANALYSIS OF THE REACTION $p\bar p \to \Lambda \bar \Lambda $ NEAR THE THRESHOLD
Authors: KUDRYAVTSEV A.E. , SAMOILOV V.M.
Published: November 2004

Analysis of the [Formula: see text] reaction is made in the near-threshold energy region [Formula: see text]. Zero range approximation for S- and P-waves fits the data. The observed anisotropy of the cross section is connected with a strong suppression of S-waves due to absorption in the initial and final states.
STOCHASTIC DIFFERENTIAL EQUATIONS ON TWO-DIMENSIONAL THEORY SPACE AND MORSE THEORY
Authors: DAS SUMIT R. , MANDAL GAUTAM , WADIA SPENTA R.
Published: November 2004

The renormalization group equations are shown to be saddle points of the action of a superparticle moving in the presence of a Kähler potential. This allows us to view the “theory space” in the language of Morse theory where the Kähler potential in the Morse function. In the case of two-dimensional field theory, Zamolodchikov’s c function can be used as a Morse function. The Morse polynomial tr (tF) can be computed entirely from the universal Virasoro data at the various fixed points and this provides a topological characterization of the space of potential functions. This idea is applied to the two-dimensional theory space which contains the c<1 minimal models.
PHASE TRANSITIONS IN ϕ4 THEORY AT FINITE DENSITIES
Authors: PETER V.J. , SABIR M.
Published: November 2004

We study the effective mass and effective coupling constant of a self interacting O(2) symmetric ϕ4 model at finite temperature and finite chemical potential in the one-loop and improved one-loop approximations. It is shown that the restored symmetry at a finite chemical potential is again broken at a higher value of chemical potential.
DARK MATTER IN THE RANDOM PHASE APPROXIMATION
Authors: CHAKRABARTI J.
Published: November 2004

We study fermionic dark matter in the random phase approximation and show that its statistical behavior is anomalous.
ARE THERE CP-VIOLATING PROCESSES IN THE STANDARD MODEL WITHOUT LOOP CORRECTIONS?
Authors: NOWAKOWSKI M. , PILAFTSIS A.
Published: November 2004

In an effort to find new CP-violating phenomena in the Standard Model, we present a new type of CP asymmetries which have interesting theoretical features. We investigate the possibility of CP nonconservation manifesting itself at Born level. We find that such processes indeed exist provided the reaction under consideration includes two W’s coupled to two different flavors and an additional boson (γ, g, Z0, H0). A second interesting aspect of these phenomena is the property that the CP-violation appears in a scattering process as opposed to that in a decay of a particle. We estimate the values of these CP asymmetries within the Standard Model with three and four generations and show that the effect is, in principle, measurable if the masses of the quarks belonging to the fourth generation are large.
COMMON ANALYTIC BASIS OF THE ζ-FUNCTION AND THE DIMENSIONAL REGULARIZATION SCHEMES
Authors: LOHIYA DAKSH
Published: November 2004

The analytic continuation invoked in the theory of generalized zeta functions associated with infinite-dimensional operators is shown to be equivalent in structure to the basic analytic methods deployed in dimensional regularization.
SUPERPARTICLES, TWISTORS AND SIEGEL SYMMETRY
Authors: SOROKIN D.P. , TKACH V.I. , VOLKOV D.V.
Published: November 2004

It is shown that an explicit incorporation of twistor variables into the lagrangian of a massless relativistic particle together with the local supersymmetrization of its proper time leads to a lagrangian which is invariant under the space-time global supersymmetry. The equivalence of the Siegel symmetry and the local proper-time supersymmetry with a complexified Grassmann parameter is established. The Siegel algebra is formed by an irreducible set of covariant constraints and is closed off-shell.
MULTIFRACTAL CLASSIFICATION OF INELASTIC PROCESSES
Authors: DREMIN I.M.
Published: November 2004

It is proposed to classify multiple production processes according to the Renyi dimensions of the (pseudo) rapidity distribution of secondary particles in individual events. The method is illustrated by some examples.
INTRINSIC MULTIPLICITY IN HADRON-HADRON COLLISIONS AND ITS IMPACT-PARAMETER DEPENDENCE
Authors: CHOU T.T.
Published: November 2004

As an improvement on the geometrical description of multiparticle emission in hadron-hadron collisions, a concept of intrinsic multiplicity n0 at fixed impact parameter is introduced. The observed large fluctuation in multiplicity distribution is attributed to (i) the large spread in the intrinsic multiplicity n0, and (ii) the Poissonian fluctuation about n0 for each b. The dependence of the intrinsic multiplicity on the impact-parameter is estimated for [Formula: see text] collisions at 540 GeV.
PARTITION FUNCTION FOR TWO LEVEL PARABOSONIC SYSTEMS
Authors: BHATTACHARYYA A. , MANSOURI F. , VAZ CENALO , WIJEWARDHANA L.C.R.
Published: November 2004

Two level parabosonic systems are the simplest systems in which the partition function exhibits intrinsic parastatistical behavior. We obtain the thermodynamic partition function for such systems and discuss its important features.
ZONAL POISSONIAN PION MULTIPLICITY IN CENTRAL 24Mg-AgBr COLLISIONS AT DUBNA ENERGY
Authors: GHOSH DIPAK , MUKHOPADHYAY AMITABHA , GHOSH ANIT , ROY JAYA
Published: November 2004

This paper reports a study on the coherent production of pions in central 24 Mg-AgBr collisions at 4.5 GeV /c per nucleon. The analysis is based on a comparison of experimental multiplicity distribution in different pseudo rapidity bins with Poissonic distributions. It has been observed that pion multiplicity is Poissonian in some specific zone. The physical implication is also discussed.
SHORT RANGE CORRELATIONS AND NUCLEON EMISSION IN PERIPHERAL RELATIVISTIC HEAVY ION COLLISIONS
Authors: BERTULANI C.A. , CANTO L.F. , DONANGELO R. , RASMUSSEN J.O.
Published: November 2004

We investigate the effects of short range correlations on nucleon emission in peripheral relativistic heavy ion collisions, following an idea originally proposed by Feshbach and Zabek. Expressions for one- and two-nucleon emission cross sections are derived and calculations for typical heavy ion systems are performed. We show that momentum conservation in the phonon absorption process leads to pronounced ridges in the quadruple-differential cross section for two-nucleon emission. We suggest that the presence of such ridges in future exclusive experiments should be considered as a signature of correlated emission of a nucleon pair.
ON THE PHASE DIAGRAM OF ASYMPTOTICALLY FREE GAUGE THEORIES WITH ADDITIONAL FOUR-FERMION INTERACTION
Authors: MIRANSKY V.A. , NONOYAMA TATSUHIKO , YAMAWAKI KOICHI
Published: November 2004

In the ladder asymptotically free gauge models with one-loop running coupling constant and additional four-fermion interaction, the structure of the phase diagram in coupling constants is determined. The anomalous dimension γm of the composite operator [Formula: see text] is calculated on the full critical line of the diagram. The possibilities of the examination of the phase diagram of such theories in lattice computer simulations are discussed.
RELATIONS BETWEEN VIRASORO ALGEBRA AND KRICHEVER-NOVIKOV ALGEBRA ON A TORUS
Authors: KUBO REIJIRO , OJIMA SHUICHI , PAUL SAMIR K.
Published: November 2004

Relations between Virasoro algebra and Krichever-Novikov (KN) algebra are investigated on a torus. Generators of the KN algebra are shown to be expressed by linear combinations of those of the Virasoro algebra. We also study the current algebra, which allows us to define the Krichever-Novikov-Kac-Moody (KNKM) algebra on the torus.
APPROXIMATE |ΔI|=1/2 RULE IN K→ππ DECAYS AND EXOTIC MESONS
Authors: TERASAKI K. , ONEDA S.
Published: November 2004

A solution to the |ΔI|=1/2 rule and its violation in K→ππ decays is presented from a new perspective. It is argued that the violation of the rule indicates the existence of exotic mesons.
RIEMANN PROBLEM AND OPERATOR FORMULATION FOR FERMIONIC THEORIES ON RIEMANN SURFACES
Authors: KIM T.W. , PARK S.U. , CHO B.H.
Published: November 2004

We study how Riemann problem is related to an operator formulation on Riemann surfaces. As a result, we show that the operator formulation is obtained as a special case of the problem.
SURVIVAL OF J/Ψ IN HADRONIC MATTER AT HIGH ENERGY DENSITY?
Authors: NEUBAUER D. , SAILER K. , MÜLLER B. , STÖCKER H. , GREINER W.
Published: November 2004

The collision rate of massive strings representing J/Ψ mesons has been determined by numerical simulation, modelling the surrounding hadronic matter as an ideal string gas in thermodynamical equilibrium. The survival time of the J/Ψ string tends to zero at the Hagedorn temperature. Whether the final state J/Ψ-nucleon scattering accounts for a major part of the observed J/Ψ suppression, depends on the value of the J/Ψ-nucleon cross section.
MODEL INDEPENDENT CONSTRAINT ON THE GLUON DISTRIBUTION FUNCTION G(X, Q2) AT SMALL X
Authors: MAHAPATRA B.P.
Published: November 2004

An asymptotic constraint on the gluon distribution function G(x, Q2) for large Q2 and small x (→0), is derived in QCD, given by [Formula: see text] where Nf=number of quark flavors and [Formula: see text] is the standard structure function measured in deep inelastic neutrino scattering. It is shown that this constraint is a rigoros upper bound for xG at any finite — Q2 for small x→0 and hence can be used to check the self-consistency of different models for G(x, Q2) proposed to describe small x physics. The subasymptotic Q2-corections to the above relation is found to be small (~15–20%) in the kinematical domain of interest at the forthcoming hadron colliders, i.e., for x<10−2, Q2>103 GeV 2. The finite Q2 — corrections are again predominantly determined by [Formula: see text]. This may, for the first time, provide a method for direct experimental measurement of xG in near future, at HERA and TEVATRON.
ON THE GEOMETRY OF GRADED CONSTRAINT ALGEBRAS: VIELBEINS, METRIC TENSORS AND THE STRING VERTEX SUPEROPERATORS
Authors: ARATYN HENRIK
Published: November 2004

The geometric interpretation of the vertex superoperators in the Neveu-Schwarz-Ramond (NSR) model is provided by associating them with a canonical mapping between abelian operators and generators of the super-Virasoro algebra. In this setting, the moments of the vertex superoperators are the corresponding vielbiens carrying graded indices.

This geometric construction defines a natural metric tensor associated with the graded constraint algebra. Consequently, our approach yields the simple Batalin-Fradkin-Vilkovisky Hamiltonian for the NSR model as the “square” of a graded vector, manifestly invariant under OSP (1, 1|2).
ON GAUGE INVARIANCE OF THE COVARIANT ACTION OF THE GREEN-SCHWARZ SUPERSTRING
Authors: HORI T. , KAMIMURA K.
Published: November 2004

The gauge invariance of the covariant classical action of the Green-Schwarz superstring with Euclidean world sheet metric is examined. The action in terms of the Majorana-Weyl spinors is shown to exist only for the chiral model (type IIB). This action coincides with the one analytically continued from the Lorentzian metric when the Majorana condition is suitably modifed.
SOLUTIONS FOR THE SU(2) CHIRAL FIELD EQUATIONS WITHOUT SPATIAL SYMMETRY
Authors: WOSPAKRIK HANS J.
Published: November 2004

Some exact solutions for the SU(2) chiral field equations in the Euclidean and Minkowskian four dimensional spacetime without spatial symmetry are presented. This is achieved by using the harmonic mappings method. Precisely, these solutions correspond to the geodesics of the 3-sphere S3, where the affine parameter is a harmonic function of spacetime.
EFFECTS OF THE CHARGED HIGGS BOSON ON THE b→sl+l− DECAY
Authors: CIUCHINI M.
Published: November 2004

The 2H model that resembles the Higgs sector of the minimal N=1 SUSY version of the standard model is considered and the contribution of the charged Higgs boson to the rate of the b→sl+l− transition is studied as a function of the free parameters MH, Mt and the squared two Higgs doublet v.e.v. ratio r. It is shown that this process can be suppressed by the charged Higgs boson contribution and that in general it is not very sensitive to its presence unless (SUSY-forbidden) values of r>1 are assumed.
MAP COLORING AND CALABI-YAU VACUA
Authors: CHAPLINE GEORGE
Published: November 2004

An algorithm for coloring planar graphs is exploited to reveal a connection between Calabi-Yau manifolds and solutions of map coloring problems on a Riemann surface. This connection may shed light on the connection between superstring vacua and topological quantum field theories.
A REMARK ON THE HIGGS EFFECT IN PRESENCE OF CHERN-SIMONS TERMS
Authors: DESER S. , YANG Z.
Published: November 2004

In D=3, a Higgs scalar is shown to transmute a non-dynamical Chern-Simon term into topologically massive, parity-violating, electrodynamics. A similar transmutation also occurs for gravity.
THE APPEARANCE OF MATTER FIELDS FROM QUANTUM FLUCTUATIONS OF 2D-GRAVITY
Authors: KAZAKOV V.A.
Published: November 2004

It is established that various critical regimes may occur for a model of two-dimensional pure quantum gravity. These regimes correspond to the presence of effective fields with scaling dimensions Δk=−γ str ·k/2, k=1, 2, 3 ..., where γ str =−1/m, m=2, 3, 4 ... is the critical exponent of “string susceptibility” (with respect to the cosmological constant). This behaviour is typical for unitary conformal fields with the central charge c=1−6/m(m+1) in the presence of 2D-quantum gravity. We use the framework of loop equations for the invariant boundary functional, which are exactly solvable in this case.
GAUGE MODELS OF “DISCRETE STRINGS”
Authors: FILIPPOV A.T. , ISAEV A.P.
Published: November 2004

A new class of constrained hamiltonian systems with a finite number of degrees of freedom is proposed in which excitations can be divided into two groups analogous to the left and right movers of string theories. Some of these models can be regarded as discrete analogs of the bosonic string, and in the continuum limit with the infinite dimensional constraint algebra Vect (S1)⊗ Vect (S1) one can obtain the classical theory of closed bosonic strings. We also discuss the problem of quantizing these models and constructing the propagator by using path integral methods. A possibility of a supersymmetric extension of our models is also pointed out.
A NOTE ON STRING AMPLITUDES AT HIGH ENERGY LIMIT
Authors: MARUI MIHO , ODA ICHIRO , SUGAMOTO AKIO
Published: November 2004

We discuss string amplitudes, in particular tree amplitude of bosonic open strings, using an approximated vertex of the light-cone field theory from the point of view of high energy.
SOLITONS IN THE PRESENCE OF CHEMICAL POTENTIAL
Authors: GUENDELMAN E.I.
Published: November 2004

We study non-trivial effects associated to the introduction of chemical potential on spontaneous symmetry breaking, and in particular on the existence of solitons. Special attention is paid to the fact that vortex solutions appear in certain models when the chemical potential is raised above a certain critical value. Possible cosmological scenarios that incorporate these effects are briefly mentioned.
STATISTICAL MECHANICS OF A RIGID BUBBLE: HIGHER DERIVATIVE QUANTUM GRAVITY ON A SPHERICAL RANDOM SURFACE EMBEDDED IN E3
Authors: KOIBUCHI HIROSHI , YAMADA MITSURU
Published: November 2004

A model of rigid surface of S2 topology embedded in a three-dimensional Euclidean space E3 is numerically studied. The action of the model has an extrinsic curvature term SEC in addition to the two-dimensional higher derivative gravity action. Since the SEC is thought of as the correlation energy of the normal vectors of the surface, it is discretized by an analogy to the σ model. The expected ideal gas behavior of the model can be seen from the Monte Carlo results at sufficiently low temperatures. The phase structure of the model is investigated and it is found that the SEC in the action causes some phase transition at an intermediate temperature.
CP ASYMMETRIES IN NONLEPTONIC DECAY OF NEUTRAL B MESONS FOR THREE AND FOUR GENERATIONS
Authors: HASUIKE TSUTOM , HATTORI TOSHIHIKO , HAYASHI TOSHIO , WAKAIZUMI SEIICHI
Published: November 2004

We investigate the effects of CP violation in nonleptonic decays of neutral B mesons (Bd, Bs) in the Kobayashi-Maskawa model through the quark exchange diagram in terms of the Wolfenstein matrix. In our calculation, we use the new data of mixing parameter xd= 0.70±0.13 which is derived from ARGUS and CLEO measurements and the new data on the branching ratio for Bd meson. We obtain the results that CP violating asymmetries for Bd→D+D−, π+π− and K+K− reach about 50% and the number of [Formula: see text] quark pairs needed to detect the asymmetry is O(106~107) at 3σ level, and the asymmetries for [Formula: see text], D−π+, D0π0 and D+π− reach the order of 20% and the number of [Formula: see text] pairs is O(108). Therefore, we may conclude that the CP violation for these decay modes is possibly observable at the present stage. The effects of fourth generation quarks on CP violation are also studied.
ON THE GLOBAL SOLUTION TO THE DIFFERENTIAL EQUATION FOR THE N-POINT CONFORMAL CORRELATOR
Authors: CHOWDHURY A. ROY , ROY SWAPNA
Published: November 2004

We have obtained compact expressions for the global solutions of the second order differential equations for the n-point conformal correlation functions. These equations were initially deduced by Belavin, Polyakov and Zamolodchikov. The monodromy property of such solutions can be ascertained from these expressions very easily.
SUPERSTRING INSPIRED NEUTRAL GAUGE BOSON IN ELASTIC ep-ASYMMETRIES
Authors: BEDNYAKOV V.A.
Published: November 2004

The possible manifestations of the superstring inspired extra Z′-boson in polarized electron and positron elastic scattering on protons was studied. The Z′-boson generated deviations from the Standard Model in asymmetries [Formula: see text] and [Formula: see text] were investigated as functions of the kinematic variable Q2, Z′-boson mass, Z–Z′ mixing angle in the U1η, U1χ and U1ψ low energy superstring models. These deviations vary from fractions of per cent to 20–25%, depending on the above mentioned parameters. We show that precise measurements of these asymmetries (for example, on the Continuous Electron Beam Accelerator Facility) can give a good opportunity to obtain strong restrictions on parameters of superstring E6-models.
GENERAL RESULTS FOR THE WITTEN INDEX USING THE WIGNER-KIRKWOOD EXPANSION
Authors: BHADURI R.K. , KHARE AVINASH , MURTHY M.V.N.
Published: November 2004

A systematic ħ-expansion of the regulated Witten index Δ(β) in one and two-dimensional SUSY quantum mechanics reveals that the lowest order ħ-term is nonzero, and all terms to at least the next four orders vanish. In one dimension, this lowest order term yields the well-known exact quantum result for an arbitrary superpotential. For the Pauli Hamiltonian with an arbitrary vector potential in two-dimensions, we find the new result that the semiclassical Δ(β) is β-independent and is equal to the number of magnetic flux lines.
CHIRAL PARTICLES IN d=3+1 DIMENSIONS FROM MAJORANA-WEYL SPINORS IN d=4+4 DIMENSIONS
Authors: VIOLLIER R.D. , FAESSLER AMAND , SCHOLTZ F.G.
Published: November 2004

We show that a Majorana-Weyl spinor in d=4+4 dimensions can be interpreted, in d=3+1 dimensions, as two particles of opposite chirality and in general of different mass. The masses of the particles are determined by dimensional reduction and depend on the invariant mass in d=3+1 dimensions and the energy p5 that is associated with the chirality operator γ5.
A SEQUENCE OF NEW CLASSICAL SOLUTIONS IN THE WEINBERG-SALAM MODEL
Authors: BRIHAYE Y. , KUNZ J.
Published: November 2004

We construct a sequence of new classical solutions in the Weinberg-Salam model, considered in the limit of an infinitely massive Higgs field. These solutions are static, spherically symmetric and have finite energy. The sequence converges to the sphaleron of Dashen, Hasslacher and Neveu. We further consider this sequence of solutions in the context of effective models of the weak interactions, where we investigate the effect of a Skyrme term on these solutions and discuss their classical stability.
CANCELLATION OF ULTRAVIOLET DIVERGENCES IN THE SU(2)L×U(1) ELECTROWEAK MODEL
Authors: DECKER ROGER , PESTIEAU JEAN
Published: November 2004

We assume that, in the SU(2)L×U(1) model, ultraviolet divergences of the charged lepton self-masses are zero. We predict the top and Higgs masses in the vicinity of the Z-boson mass. Our assumption holds only if there are no more than three generations of quarks and leptons and if quarks and leptons, except for the top quark, have negligible masses compared to the W-boson mass.
SUPERSYMMETRIC MASSLESS PARTICLE WITH RIGIDITY
Authors: PLYUSHCHAY M.S.
Published: November 2004

We construct the supersymmetric extension of the model of a massless particle with rigidity whose action is proportional to the curvature of the particle world trajectory. The covariant quantization of the system in the general case of an N-supersymmetry is performed.
EVOLUTION OF ISOCURVATURE PERTURBATIONS I: PHOTON-BARYON UNIVERSE
Authors: KODAMA HIDEO , SASAKI MISAO
Published: November 2004

The isocurvature perturbation in the photon-baryon universe is comprehensively studied by analytic methods in the framework of the gauge-invariant perturbation theory. In particular the evolutionary behavior of the isocurvature perturbation and its influence on the anisotropy in the cosmic microwave background are examined in detail. The results are compared with those for the adiabatic perturbation and some peculiar features of the isocurvature perturbation are pointed out and their origin is clarified. Besides these studies the ambiguities associated with the definition of non-adiabatic perturbations, especially the so-called isothermal perturbation are critically discussed and a clear definition of isocurvature perturbation is given.
A MARIONETTE UNIVERSE
Authors: NOVELLO M. , OLIVEIRA L.A.R.
Published: November 2004

We present a study of the nonminimal coupling of a vector field to gravity in the context of a Weyl integrable space-time (WIST). This system admits a cosmic solution in which such vector field is not determined dynamically although it rules the evolution of the metric. In a sense, the physical causes of the evolution of the cosmos appear to be out of dynamical control—a feature that can be assigned to a Marionette Universe.
INFLATION AND COSMIC STRINGS: TWO MECHANISMS FOR PRODUCING STRUCTURE IN THE UNIVERSE
Authors: BRANDENBERGER ROBERT H
Published: November 2004

In this article the basic mechanism of inflation and the main points of the cosmic string theory are reviewed. The ways in which both theories lead to structure are compared.
INFINITE DIMENSIONAL EXTENDED SUPERCONFORMAL LIE ALGEBRAS
Authors: GASTMANS R. , SEVRIN A. , TROOST W. , VAN PROEYEN A.
Published: November 2004

We investigate the general algebras which contain the two-dimensional conformal algebra (Virasoro algebra) and N fermionic generators. We demand that the latter are of the "Neveu-Schwarz type". String theories are known with N = 2 and N = 4 extensions. We show under which assumptions these are unique. We construct all possible N = 2 algebras, containing the previously known ones. General conditions are given for extensions to arbitrary N, and special examples are worked out.
MASSLESS SPINNING PARTICLES IN ALL DIMENSIONS AND NOVEL MAGNETIC MONOPOLES
Authors: ATRE M. V. , BALACHANDRAN A. P. , GOVINDARAJAN T. R.
Published: November 2004

There is a well-known description of a massless particle with spin in four dimensions in terms of position and momentum operators. The charge-monopole system can be obtained therefrom by a simple canonical transformation and a suitable choice of the Hamiltonian. In this paper, we generalize this description of a massless spinning particle to higher dimensions and then use the aforementioned transformation to define novel charge-monopole systems which are non-Abelian generalizations of the Abelian system of Dirac. The Lagrangian description of all these systems and their canonical quantization are also discussed. The analysis reveals the existence of symplectic structures which are likely to be original in the context of particle physics and which incidentally are capable of generalization to string theories. It further gives rise to new monopole fields which may be of use in the context of dimensional compactification.
THE CHOU-YANG MODEL AND π−p ELASTIC SCATTERING
Authors: SALEEM MOHAMMAD
Published: November 2004

The prediction that the use of the Borkowski form factor for proton in the Chou-Yang model for π−p elastic scattering at 200 GeV/c yields multiple dip structure in the region −5 ≲ −t ≲ 8 (GeV/c) 2 is shown to be incorrect. A parameterization of the proton form factor obtained by including the new experimental data for large −t when used in conjunction with pion form factor also does not produce the observed dip near −t = 4 (GeV/c) 2. Three possible approaches for a solution of the problem are briefly discussed.
THE GLOBAL STRUCTURE OF THE INFLATIONARY UNIVERSE
Authors: GONCHAROV A. S. , LINDE A. D. , MUKHANOV V. F.
Published: November 2004

In this article we give a review of recent results concerning the global structure of the inflationary universe, which have been obtained within stochastic approach to inflation. It is shown in particular that the evolution of the universe in the chaotic inflation scenario has no end and may have no beginning. In this scenario the major part of the physical volume of the universe always remains in the inflationary phase. During inflation the universe becomes divided into many exponentially large domains, inside which all possible metastable vacuum states and all possible types of compactification compatible with inflation are realized.
REVIEW OF RECENT DEVELOPMENTS IN SUPERSTRING THEORY
Authors: SCHWARZ JOHN H.
Published: November 2004

After proposing a procedure for classifying string theories, we describe the various local symmetries that can occur on the world sheet with special emphasis on Kac–Moody algebras in superconformal theories. The construction of multiloop amplitudes is briefly reviewed. Then the constraint of modular invariance is analyzed for models in which the internal degrees of freedom are described by fermions. Next we consider the construction of consistent classical solutions. A few examples are presented for both the heterotic and type II superstring theories. A brief description of some recent work in string field theory and other approaches to a nonperturbative formulation of string theory is presented.