bluuebunny/crossref_metadata_2025 huggingface dataset:
TOWARD SECOND-QUANTIZATION OF D5-BRANE
Authors: NAKATSU TOSHIO
Published: September 2003

A framework of second-quantization of D5-branes is proposed. It is based on the study of topology of the moduli space of their low energy effective world volume theory. Among the topological cycles whose resolve singularities caused by overlapping D5-branes, there are introduced those cycles which duals, constituting a subspace of cohomology group of the moduli space, turn out to define the Fock space of the second-quantized D5-branes. The second-quantized operators are given by creation and annihilation operators of those cycles or their duals.
IS THE STANDARD INTERPRETATION OF CPT-VIOLATION PARAMETER FOR NEUTRAL KAON COMPLEX WELL FOUNDED?
Authors: URBANOWSKI K.
Published: September 2003

Basic assumptions necessary for the proof of the CPT theorem are considered. It is found that the CPT theorem is not valid for a physical system with unstable particles decaying exponentially. The Lee, Oehme and Yang (LOY) model of neutral kaons decay is discussed and the conclusion is drawn that CPT-transformation cannot be a symmetry in a system which contains the LOY model as a subsystem, and, thus this model is shown to be incapable of describing possible CPT-violation effects correctly. The approximate formulae for matrix elements of the effective Hamiltonian H‖ governing the time evolution in neutral kaons subspace (different from those obtained by means of the Weisskopf–Wigner method and used by LOY) and their implications for an interpretation of the standard CPT-violation parameter [Formula: see text] are considered. Within this approximation it is shown that [Formula: see text] in the system preserving CPT-symmetry and that δ=0 is possible only if [Formula: see text], where H is the total Hamiltonian of the system under consideration, that is, if the system does not preserve CPT-symmetry.
GAUGE GROUP TQFT AND IMPROVED PERTURBATIVE YANG–MILLS THEORY
Authors: BAULIEU LAURENT , SCHADEN MARTIN
Published: September 2003

We reinterpret the Faddeev–Popov gauge-fixing procedure of Yang–Mills theories as the definition of a topological quantum field theory for gauge group elements depending on a background connection. This has the advantage of relating topological gauge-fixing ambiguities to the global breaking of a supersymmetry. The global zero modes of the Faddeev–Popov ghosts are handled in the context of an equivariant cohomology without breaking translational invariance. The gauge-fixing involves constant fields which play the role of moduli and modify the behavior of Green functions at subasymptotic scales. At the one loop level physical implications from these power corrections are gauge invariant.
CRITICAL CORRELATIONS OF THE TWO-DIMENSIONAL, THREE-STATE POTTS MODEL
Authors: McCABE JOHN , WYDRO TOMASZ
Published: September 2003

We exploit the identification between the critical theory of the three-state Potts model and the D5 conformal model. This allows us to determine all three-point correlations involving the fields associated with the Potts order parameter and the energy density. The calculation uses screened Coulomb gas correlations. The Z3 symmetry of the three-state Potts model is manifestly preserved.
HEAVY BARYONS IN THE QUARK-DIQUARK PICTURE
Authors: EBERT DIETMAR , FELDMANN THORSTEN , KETTNER CHRISTIANE , REINHARDT HUGO
Published: September 2003

We describe heavy baryons as bound states of a quark and a diquark. For this purpose we derive the Faddeev equation for baryons containing a single heavy quark from a Nambu–Jona–Lasinio type of model which is appropriately extended to include also heavy quarks. The latter are treated in the heavy mass limit. The heavy baryon Faddeev equation is then solved using a static approximation for the exchanged quark.
ℏ (YANGIAN) DEFORMATION OF THE MIURA MAP AND VIRASORO ALGEBRA
Authors: DING XIANG-MAO , HOU BO-YU , ZHAO LIU
Published: September 2003

An ℏ-deformed Virasoro Poisson algebra is obtained using the Wakimoto realization of the Sugawara operator for the Yangian double DYℏ( sl 2)c at the critical level c=-2.
INVARIANT KINEMATICS ON A ONE-DIMENSIONAL LATTICE IN NONCOMMUTATIVE GEOMETRY
Authors: ATZMON E.
Published: September 2003

In a one-dimensional lattice, the induced metric (from a noncommutative geometry calculation) breaks translation invariance. This leads to some inconsistencies among different spectator frames, in the observation of the hoppings of a test particle between lattice sites. To resolve the inconsistencies between the different spectator frames, we replace the test particle's bare mass by an effective locally dependent mass. This effective mass also depends on the lattice constant — i.e. it a scale dependent variable (a "running" mass).

We also develop an alternative approach based on a compensating potential. The induced potential between a spectator frame and the test particle is attractive on the average.

We then show that the entire formalism holds for a quantum particle represented by a wave function, just as it applies to the mechanics of a classical point particle.
VACUUM PROPERTIES OF A NONLOCAL THIRRING-LIKE MODEL
Authors: BARCI D. G. , NAÓN C. M.
Published: September 2003

We use path-integral methods to analyze the vacuum properties of a recently proposed extension of the Thirring model in which the interaction between fermionic currents is nonlocal. We calculate the exact ground state wave functional of the model for any bilocal potential, and also study its long-distance behavior. We show that the ground state wave functional has a general factored Jastrow form. We also find that it possesses an interesting symmetry involving the interchange of density–density and current–current interactions.
VACUUM DECAY VIA LORENTZIAN WORMHOLES
Authors: ROSALES J. L.
Published: September 2003

We speculate about the space–time description due to the presence of Lorentzian worm-holes (handles in space–time joining two distant regions or other universes) in quantum gravity. The semiclassical rate of production of these Lorentzian wormholes in Reissner–Nordström space–times is calculated as a result of the spontaneous decay of vacuum due to a real tunneling configuration. In the magnetic case it only depends on the value of the field theoretical fine structure constant. We predict that the quantum probability corresponding to the nucleation of such geodesically complete space–times should be acutally negligible in our physical Universe.
QUANTUM FLUCTUATIONS FOR A SCALAR FIELD IN THE SPACE–TIME OF GRAVITATIONAL IMPLUSIVE WAVE
Authors: ENGINER Y. , HORTAÇSU M. , ÖZDEMIR N.
Published: September 2003

Quantum fluctuations for a massless scalar field in the background metric of spherical implusive gravitational waves propagating through Minkowski and de Sitter spaces are investigated. It is shown that there exist finite fluctuations for de Sitter space.
AN EXACT MODEL OF AN INFINITE COSMIC STRING
Authors: DE OLIVEIRA SOUZA MARCELO , SOM M. M.
Published: September 2003

We present here an exact model of an infinite cosmic string. The linear mass density of the source is finite and the solution is regular everywhere. All the arbitrary constants of the solutions are expressed in terms of the known constants of the U(1) gauge theory.
STRING THEORY ON THREE-DIMENSIONAL BLACK HOLES
Authors: NATSUUME MAKOTO , SATOH YUJI
Published: September 2003

We investigate the string theory on three-dimensional black holes discovered by Bañados, Teitelboim and Zanelli in the framework of conformal field theory. The model is described by an orbifold of the [Formula: see text] WZW model. The spectrum is analyzed by solving the level matching condition and we obtain winding modes. We then study the ghost problem and show explicit examples of physical states with negative norms. We discuss the tachyon propagation and the target space geometry, which are irrelevant to the details of the spectrum. we find a self-dual T-duality transformation reversing the black hole mass. We also discuss difficulties in string theory on curved space–time and possibilities of obtaining a sensible string theory on three-dimensional black holes. This work is the first attempt to quantize a string theory in a black hole background with an infinite number of propagating modes.
NONEXTREME BLACK HOLES FROM INTERSECTING M-BRANES
Authors: OHTA NOBUYOSHI , SHIMIZU TAKASHI
Published: September 2003

We investigate the possibility of extending nonextreme black hole solutions made of intersecting M-branes to those with two nonextreme deformation parameters, similar to Reissner–Nordstrøm solutions. General analysis of possible solutions is carried out to reduce the problem of solving field equations to a simple algebraic one for static spherically-symmetric case in D dimensions. The results are used to show that the extension to two-parameter solutions is possible for D= 4,5 dimensions but not for higher dimensions, and that the area of horizon always vanishes in the extreme limit for black hole solutions for D≥6 except for two very special cases which are identified. Various solutions are also summarized.
PERIODS, COUPLING CONSTANTS AND MODULAR FUNCTIONS IN N=2 SU(2) SYM WITH MASSIVE MATTER
Authors: BRANDHUBER A. , STIEBERGER S.
Published: September 2003

We determine the mass dependence of the coupling constant for N= 2 SYM with Nf= 1,2,3 and 4 flavors. All these can be unified in one analytic expression, given by a Schwarzian trainge function. Moreover we work out the connection to modular functions which enables us to give explicit formulas for the periods. Using the form of the J-functions we are able to determine in an elegant way the couplings and monodromies at the superconformal points.
KNIZHNIK–ZAMOLODCHIKOV-TYPE EQUATIONS FOR GAUGED WZNW MODELS
Authors: KOGAN IAN I. , LEWIS ALEX , SOLOVIEV OLEG A.
Published: September 2003

We study correlation functions of coset constructions by utilizing the method of gauge dressing. The given method results in a system of differential equations which are generalizations of the Knizhnik–Zamolodchikov equation. As an example, we apply this method to the minimal models and to the Witten 2D black hole. We exhibit a striking similarity between the latter and the gravitational dressing. In particular, we look for logarithmic operators in the 2D black hole.
ON THE PHYSICAL PROPERTIES RELATED TO THE ALGEBRAIC STRUCTURE OF THE DIRAC EQUATION IN THREE-DIMENSIONAL SPACE–TIME
Authors: LINHARES C. A. , MIGNACO JUAN A.
Published: September 2003

We look for the physical consequences resulting from the SU(2) ⊗ SU(2) algebraic structure of the Dirac equation in three-dimensional space–time. We show how this is obtained from the general result we have proven relating the matrices of the Clifford–Dirac ring and the Lie algebra of unitary groups. It allows the introduction of a notion of chirality closely analogous to the one used in four dimensions. The irreducible representations for the Dirac matrices may be labelled with different chirality eigenvalues, and they are related through inversion of any single coordinate axis. We analyze the different discrete transformations for the space of solutions. Finally, we show that the spinor propagator is a direct sum of components with different chirality; the photon propagator receive separate contributions for both chiralities, and the result is that there is no generation of a topological mass at one-loop level. In the case of a charged particle in a constant "magnetic" field we have a good example where chirality plays a determinant role for the degeneracy of states.
SUPERSYMMETRIC GENERALIZATION OF BOUSSINESQ–BURGER SYSTEM
Authors: ROY P. K.
Published: September 2003

We generalize the Boussinesq–Burger coupled equation by constructing supersymmetric two boson system that is integrable. We obtain two super Hamiltonians and consequently two different set of supersymmetric coupled equations corresponding to the two Hamiltonians.
T DUALITY AND TIME DEVELOPMENT OF A (2+1)-DIMENSIONAL STRING UNIVERSE
Authors: HOTTA KENJI , KIKKAWA KEIJI , SAKAMOTO MICHIHIKO
Published: September 2003

The time development of a model (2+1)-dimensional torus universe is studied based on background field equations which follow from a string theory. The metrics in various cases are characterized by a real parameter which specifies a ratio of the lengths of two independent cycles. When the parameter is a rational number, the space is asymptotically stretched along a cycle while the other cycle kept finite. When the parameter is an irrational number, the lengths of two cycles, as well as the space volume (area), grow in proportion to the proper time t for an observer sitting at rest in this universe in the asymptotic region.
THERMODYNAMIC POTENTIAL WITH CONDENSATE FIELDS IN AN SU(2) MODEL OF QCD
Authors: EBERT D. , ZHUKOVSKY V. Ch. , VSHIVTSEV A. S.
Published: September 2003

We calculate the thermodynamic potential of the quark–gluon plasma in an SU(2) model of QCD, taking into account the gluon condensate configuration with a constant A4-potential and a uniform chromomagnetic field H. Within this scheme the interplay of condensate fields, as well as the role of quarks in the possible dynamical stabilization of the system is investigated.
N=1 SUPERCONFORMAL SYMMETRY IN FOUR DIMENSIONS
Authors: PARK JEONG-HYUCK
Published: September 2003

The N=1, d=4 superconformal group is studied and its representations are discussed. Under superconformal transformations, left invariant derivatives and some class of superfields, including supercurrents, are shown to follow these representations. In other words, these superfields are quasiprimary by analogy with two-dimensional conformal field theory. Based on these results, we find the genenal forms for the two-point and the three-point Green functions of the quasiprimary superfields in a group theoretical way. In particular, we prove that the two-point and the three-point Green functions of supercurrents are unique and present the explicit formulae of them.
PERTURBATIVE ANALYSIS OF CHERN–SIMONS FIELD THEORY IN THE COULOMB GAUGE
Authors: FERRARI FRANCO , LAZZIZZERA IGNAZIO
Published: September 2003

In this paper, we analyse the perturbative aspects of Chern–Simons field theories in the Coulomb gauge. We show that in the perturbative expansion of the Green functions there are neither ultraviolet nor infrared divergences. Moreover, all the radiative corrections are zero at any loop order. Some problems connected with the Coulomb gauge fixing, like the appearance of spurious singularities in the computation of the Feynman diagrams, are discussed and solved. The regularization used here for the spurious singularities can be easily applied also to the Yang–Mills case, which is affected by similar divergences.
FLAVOR-ASYMMETRIC SEA QUARK DISTRIBUTION IN A CHIRAL POTENTIAL MODEL
Authors: ROY-MAITY KAKALI , DASGUPTA PADMANABHA
Published: September 2003

Flavor asymmetry of the sea quark distribution which expresses itself in the observed value of the Gottfried sum leads one to consider pion emission as directly contributing to the scale dependence of structure functions. As an example, we study the evolution of structure functions in a chiral potential model which incorporates the pion as the chiral-symmetry-restoring field and which was originally invented to explain the static properties of baryons. Evolution equations for the quark and pion densities are derived in the lowest order at subasymptotic Q2. The kernels of evolution for the effective quark densities turn out to be flavor-dependent and are endowed with properties quite distinct from those possessed by leading log QCD splitting functions. In particular, the commonly used probabilistic treatment of the evolution, which is legitimate in the kinematic region of the perturbative QCD evolution, is seen not to be valid in the domain of applicability of the chiral potential model. The model is shown to lead to nontrivial evolution of the nonsinglet moments in a manner consistent with the observed departure from the Gottfried sum rule in a low Q2 region. For higher Q2, the evolution of the Gottfried sum receives also an additive contribution not envisaged in the earlier works on the phenomenon.
q-UNCERTAINTY RELATIONS
Authors: FINKELSTEIN ROBERT J.
Published: September 2003

As oen would anticipate from the realization of the q-commutators by difference operators, the states of maximum localization are smeared δ-functions dependeing on q.
THE N=2 VECTOR–TENSOR MULTIPLET, CENTRAL CHARGE SUPERSPACE, AND CHERN–SIMONS COUPLINGS
Authors: GRIMM RICHARD , HASLER MAXIMILIAN , HERRMANN CARL
Published: September 2003

We present a new, alternative interpretation of the vector–tensor multiplet as a two-form in central charge superspace. This approach provides a geometric description of the (nontrivial) central charge transformations ab initio and is naturally generalized to include couplings of Chern–Simons forms to the antisymmetric tensor gauge field, giving rise to a N=2 supersymmetric version of the Green–Schwarz anomaly cancellation mechanism.
JETS AND KINEMATICS IN HADRONIC COLLISIONS
Authors: BADEN ANDREW R.
Published: September 2003

Analysis of colliding-beam hadron experiments [Formula: see text] often depend upon observation of "jets" — a highly collimated spray of particles such as π, K, e, μ and γ's forming clusters of energy deposition in calorimeters. In this paper we outline how to define jets from such clusters and discuss the meaning of jet quantities such as transverse energy and mass. Data from the DØ experiment are used to illustrate these concepts. In addition, we review the motivations for using certain optimal coordinates for describing energy–momentum four-vectors, and derive interesting relationships among the kinematic variables.
SOFTLY BROKEN N=2 QCD WITH MASSIVE QUARK HYPERMULTIPLETS, II
Authors: ÁLVAREZ-GAUMÉ LUIS , MARIÑO MARCOS , ZAMORA FREDERIC
Published: September 2003

We analyze the vacuum structure of N=2, SU(2) QCD with massive quark hypermultiplets, once supersymmetry is softly broken down to N=0 with dilaton and mass spurions. We give general expressions for the low energy couplings of the effective potential in terms of elliptic functions to have a complete numerical control of the model. We study in detail the possible phases of the theories with Nf=1,2 flavors for different values of the bare quark masses and the supersymmetry breaking parameters and we find a rich structure of first order phase transitions. The chiral symmetry breaking pattern of the Nf=2 theory is considered, and we obtain the pion Lagrangian for this model up to two derivatives. Exact expressions are given for the pion mass and Fπ in terms of the magnetic monopole description of chiral symmetry breaking.
HODGE NUMBER DISTRIBUTION FOR CICY MANIFOLDS
Authors: GAGNON M.
Published: September 2003

The method of exact and spectral sequences is applied to compute the Hodge numbers of all known complete intersection Calabi–Yau manifolds. When plotted on a two-dimensional chart, the distribution of their values reveals an interesting periodic pattern. Next, we introduce a seven-dimensional crystal-like structure which seems to be relevant to study the systematics of the Hodge number distribution.
THE QUANTIZATION AND PRODUCTION OF THE SPACE–TIME DEFECTS IN THE EARLY UNIVERSE
Authors: DUAN YISHI , YANG GUOHONG , JIANG YING
Published: September 2003

In Riemann–Cartan manifold U4, a new topological invariant is obtained by means of the torsion tensor. In order to describe the space–time defects (which appear in the early universe due to torsion) in an invariant form, the new topological invariant is introduced to measure the size of defects and it is interpreted as the dislocation flux in internal space. By the use of the so-called ϕ mapping method and the gauge potential decomposition, the dislocation flux is quantized in units of the Planck length. The quantum numbers are determined by the Hopf indices and the Brouwer degrees. Furthermore, the dynamic form of the dislocations is studied by defining an identically conserved current. Based on the implicit function theorem, the production of the defects at the limit points is detailed.
CLIFFORD ALGEBRAS IN FINITE QUANTUM FIELD THEORIES I.
Authors: LUCHA WOLFGANG , MOSER MICHAEL
Published: September 2003

Finite quantum field theories may be constructed from the most general renormalizable quantum field theory by forbidding, order by order in the perturbative loop expansion, all ultraviolet-divergent renormalizations of the physical parameters of the theory. The relevant finiteness conditions resulting from this requirement relate all dimensionless couplings in the theory. At first sight, Yukawa couplings which are equivalent to the generators of some Clifford algebra with identity element represent a very promising type of solutions of the condition for one-loop finiteness of the Yukawa couplings. However, under a few reasonable and simplifying assumptions about their particular structure, these Clifford-like Yukawa couplings prove to be in conflict with the requirements of one- and two-loop finiteness of the gauge coupling and of the absence of gauge anomalies, at least for all simple gauge groups up to and including rank 8.
TOWARDS CONSTRUCTING ONE-PARTICLE REPRESENTATIONS OF THE DEFORMED POINCARÉ ALGEBRA
Authors: YAKUSHIN I.
Published: September 2003

We give a method for obtaining states of massive particle representations of the two-parameter deformation of the Poincaré algebra proposed in Refs. 1–3. We discuss four procedures to generate eigenstates of a complete set of commuting operators starting from the rest state. One result of this work is the fact that upon deforming to the quantum Poincaré algebra, the rest state is split into an infinite number of states. Another result is that the energy spectrum of these states is discrete. Some curious residual degeneracy remains: there are states constructed by applying different operators to the rest state which nevertheless are indistinguishable by eigenvalues of all the observables in the algebra.
ON THE GENERAL COVARIANCE IN BOHMIAN QUANTUM GRAVITY
Authors: SHOJAI FATIMAH , GOLSHANI MEHDI
Published: September 2003

It is shown explicitly that in the framework of Bohmian quantum gravity, the equations of motion of the space–time metric are Einstein's equations plus some quantum corrections. It is observed that these corrections are not covariant, so that in the framework of Bohmian quantum gravity the general covariance principle breaks down at the individual level. This principle is restored at the statistical level.
THE HEAVY QUARK FRAGMENTATION FUNCTION AND THE MULTIPLICITY DIFFERENCE BETWEEN HEAVY AND LIGHT QUARK HADRONIC EVENTS IN e+e- ANNIHILATION IN THE LONGITUDINAL PHASE SPACE MODEL
Authors: WANG QUN , LIU XI-MING , XIE QU-BING
Published: September 2003

The heavy quark fragmentation function and the multiplicity difference between heavy and light quark hadronic events are explained in a unified framework, namely the longitudinal phase space model. Good agreement of the predictions with data has been achieved.
EFFECTIVE POTENTIAL FOR D-BRANE IN CONSTANT ELECTROMAGNETIC FIELD
Authors: NOJIRI SHIN'ICHI , ODINTSOV SERGEI D.
Published: September 2003

We discuss the one-loop effective potential and static (large d) potential for toroidal D-brane described by DBI-action in constant magnetic and in constant electric fields. Explicit calculation is done for membrane case (p=2) for both types of external fields and in case of static potential for an arbitrary p. In the case of one-loop potential it is found that the presence of magnetic background may stabilize D-brane giving the possibility for non-pointlike ground state configuration. On the same time, constant electrical field acts against stabilization and the correspondent one-loop potential is unbounded from below. The properties of static potential which also has stable minimum are described in detail. The back-reaction of quantum gauge fields to one-loop potential is also evaluated.
NON-ABELIAN PROCA MODEL BASED ON THE IMPROVED BFT FORMALISM
Authors: PARK MU-IN , PARK YOUNG-JAI
Published: September 2003

We present the newly improved Batalin–Fradkin–Tyutin (BFT) Hamiltonian formalism and the generalization to the Lagrangian formulation, which provide a much more simple and transparent insight into the usual BFT method, with application to the non-Abelian Proca model, which has been a difficult problem in the usual BFT method. The infinite terms of the effectively first class contraints can be made to be the regular power series forms by an ingenious choice of Xαβ and ωαβ matrices. In this new method, the first class Hamiltonian, which also needs infinite correction terms, is obtained simply by replacing the original variables in the original Hamiltonian with the BFT physical variables. Remarkably, all the infinite correction terms can be expressed in the compact exponential form. We also show that in our model the Poisson brackets of the BFT physical variables in the extended phase space have the same structure as the Dirac brackets of the original phase space variables. With the help of both our newly developed Lagrangian formulation and Hamilton's equations of motion, we obtain the desired classical Lagrangian corresponding to the first class Hamiltonian which can be reduced to the generalized Stückelberg Lagrangian which is a nontrivial conjecture in our infinitely many terms involved in the Hamiltonian and the Lagrangian.
QUARK MASS MATRICES IN SUPERSTRING MODELS
Authors: KOBAYASHI TATSUO , XING ZHI-ZHONG
Published: September 2003

Four simple but realistic patterns of quark mass matrices are derived from orbifold models of superstring theory in the absence of gauge symmetries. Two of them correspond to the Ramond–Roberts–Ross types, which have five texture zeros in up and down quark sectors. The other two, with four texture zeros, preserve the structural parallelism between up and down sectors. The phenomenological consequences of these mass matrices on flavor mixing and CP violation are analyzed at the weak scale. With the same input values of quark mass ratios, we find that only one or two of the four patterns can be in good agreement with current experimental data.
PHYSICS AT e-e-: A CASE FOR MULTI-CHANNEL STUDIES
Authors: MURAYAMA HITOSHI
Published: September 2003

I argue that it would be crucial to have as many channels as possible to understand the physics of electroweak symmetry breaking (EWSB) in next-generation collider experiments. A historic example of the parity violation and the V-A interaction is used to make this point. An e-e- option offers us a new channel in this respect. The usefulness of this channel is exemplified for the case of supersymmetry and of the strongly coupled EWSB sector.
"CENTRAL PRODUCTION" OF SCALARS IN e-e- COLLISIONS
Authors: MINKOWSKI PETER
Published: September 2003

We discuss the production of the standard Higgs scalar in the reaction e-e-→e-e-X mediated by ZZ or γγ fusion. It provides even sensitivity for a wide band of scalar masses [Formula: see text].
PROBING THE MSSM HIGGS SECTOR AT AN e-e- COLLIDER
Authors: HABER HOWARD E.
Published: September 2003

The theoretical structure of the Higgs sector of the Minimal Supersymmetric Standard Model (MSSM) is briefly described. An outline of Higgs phenomenology at future lepton colliders is presented, and some opportunities for probing the physics of the MSSM Higgs sector at an e-e- collider are considered.
PRECISION SUPERSYMMETRY MEASUREMENTS AT THE e-e- COLLIDER
Authors: CHENG HSIN-CHIA
Published: September 2003

Measurements of supersymmetric particle couplings provide important verification of supersymmetry. If some of the superpartners are at the multi-TeV scale, they will escape direct detection at planned future colliders. However, such particles induce nondecoupling corrections in processes involving the accessible superparticles through violations of the supersymmetric equivalence between gauge boson and gaugino couplings. These violations are analogous to the oblique corrections in the electroweak sector of the Standard Model, and can be parametrized in terms of super-oblique parameters. The e-e- collision mode of a future linear collider is shown to be an excellent environment for such high precision measurements of these SUSY parameters, which will provide an important probe of superparticles beyond reachable energies.
STRONGLY-INTERACTING ELECTROWEAK SECTOR AT e-e- COLLIDERS
Authors: HAN TAO
Published: September 2003

We study the possible experimental signatures resulting from a strongly-interacting electroweak sector at e-e- colliders, emphasizing the signal enhancement by high beam polarization. We also discuss the unique role for operating the collider in e-γ mode to produce a heavy isosinglet vector state ωT.
BILEPTONS – STATUS AND PROSPECTS
Authors: FRAMPTON PAUL H.
Published: September 2003

Theoretical background for bileptonic gauge bosons is reviewed, both the SU(15) GUT model and the 3-3-1 model. Then the mass limits for bileptons are discussed coming from e+e- scattering, polarized muon decay and muonium-antimuonium conversion. A consequence of precision electroweak data on the masses is mentioned. Discovery in e-e- at a linear collider is emphasised.
LEPTOQUARKS AT FUTURE LEPTON COLLIDERS
Authors: RIZZO THOMAS G.
Published: September 2003

In this talk I summarize the capability of future lepton colliders to discover leptoquarks and to determine their electroweak quantum numbers. This analysis is an updated discussion based on the results presented in the Snowmass 1996 New Phenomena Working Group report as well as some more recent work that has appeared in the literature as a result of the HERA high-Q2 excess.
THE TROUBLE WITH "INVERSE NEUTRINOLESS DOUBLE BETA DECAY"
Authors: HEUSCH CLEMENS A.
Published: September 2003

The trouble with neutrinoless doble beta decay is not its non-observation up to the present time: the trouble is caused by the misinterpretation of this negative result. We show that the existence of heavy Majorana neutrinos in the TeV mass range is not precluded by present evidence.
PROBING TOP-QUARK COUPLINGS AT LEPTON AND PHOTON COLLIDERS
Authors: HEWETT JOANNE L.
Published: September 2003

The ability of high energy lepton and photon colliders to probe the gauge couplings of the top-quark is summarized.
MEASUREMENT OF THE TWO-PHOTON DECAY WIDTH OF THE INTERMEDIATE MASS HIGGS BOSONS IN A PHOTON-PHOTON COLLIDER
Authors: OHGAKI T. , TAKAHASHI T. , WATANABE I. , TAUCHI T.
Published: September 2003

The feasibility of a measurement of the partial decay width of the intermediate-mass Higgs boson(MH=120 GeV ) into two photons at a photon-photon collider is studied by a simulation. It is found that the two-photon decay width can be measured with the statistical error of 7.6% with the integrated luminosity of 10fb-1. We also discussed a possibility toward further improvement with sophisticated b-quark tagging technique.
HIGH ENERGY PHOTON-PHOTON AND ELECTRON-PHOTON COLLISIONS
Authors: BRODSKY STANLEY J.
Published: September 2003

The advent of a next linear e±e- collider and back-scatterd laser beams will allow the study of a vast array of high energy processes of the Standard Model through the fusion of real and virtual photons and other gauge bosons. As examples, I discuss virtual photon scattering γ*γ*→X in the region dominated by BFKL hard Pomeron exchange and report the predicted cross sections at present and future e±e- colliders. I also discuss exclusive γγ reactions in QCD as a measure of hadron distribution amplitudes and a new method for measuring the anomalous magnetic and quadrupole moments of the W and Z gauge bosons to high precision in polarized electron-photon collisions.
THE TESLA LINEAR COLLIDER PROJECT
Authors: SCHREIBER S.
Published: September 2003

TESLA is one of the projects for a next generation TeV linear collider. Emphasis is on e+e--Physics at an initial center of mass energy of 500 GeV and a luminosity above 5·1033 cm -2 s -1. Different to other approaches, TESLA has chosen superconducting acceleration structures operated at 1.3 GHz. In this report, the TESLA project is briefly described and some aspects of a possible e-e--mode are discussed.
THE TESLA DETECTOR
Authors: SCHREIBER S.
Published: September 2003

The joint ECFA/DESY Study "Physics and Detectors for a Linear Collider" has worked out a proposal for a detector for a next generation TeV e+e- linear collider. In this report, the principle design and layout of the proposed detector with emphasis on the TESLA version is reviewed. Examples of reference reactions studied to demonstrate the detector performance are given.
LIMITATIONS IMPOSED BY BEAM-BEAM EFFECTS AND THEIR REMEDIES
Authors: SPENCER J. E.
Published: September 2003

Effects that limit the luminosities of a general purpose linear collider or GLC capable of [Formula: see text], [Formula: see text] and [Formula: see text] incident channels are discussed together with potential mitigations. The relative characteristics of such channels and their luminosities are predicted based on differing assumptions – including those for the current configurations for the NLC at [Formula: see text] and 1.0 TeV. Disadvantages related to the increased complexity of linear colliders can be offset by broader design constraints that seek to optimize the generalized luminosity. Decreased disruptions and bunch charges are effective and can be used in combination with feasable charge compensation schemes to predict higher luminosities and power conversion efficiencies. The incremental costs of additional channels is modest compared to the cost of any one by itself or potential gains in the integrated luminosity.
e-e- COLLISIONS IN A TeV LINEAR COLLIDER BUILT FOR e+e- OPERATION
Authors: ERICKSON R.
Published: September 2003

In this paper, we discuss practical issues that must be addressed to reconfigure an e+e- linear collider for e-e-operation and argue that modest steps should be taken during the design stage to preserve this operation.
CAIN SIMULATION STUDIES FOR e-e- COLLISIONS
Authors: WEIDEMANN ACHIM W.
Published: September 2003

Disruption effects in e-e- collisions at a future linear collider affect the attainable luminosity; the angular spread of the disrupted beam particles may present a background in a detector. In this paper, I present simulations of the beam-beam interaction with the simulation code CAIN of relevance for these questions.
HIGHLY POLARIZED ELECTRON BEAMS FOR LINEAR COLLIDERS
Authors: CLENDENIN J. E.
Published: September 2003

The SLC operates with electron beams having a polarization of ~ 80%. The physics opportunities for future colliders will be greatly enhanced if the beam polarization can be significantly higher. The prospects for achieving electron single-beam polarizations > 95% are discussed. A complimentary achievement would be to use two-beam polarization.
A REVIEW OF THREE-FAMILY GRAND UNIFIED STRING MODELS
Authors: KAKUSHADZE ZURAB , SHIU GARY , HENRY TYE S.-H. , VTOROV-KAREVSKY YAN
Published: September 2003

We review the construction and classification of three-family grand unified models within the framework of asymmetric orbifolds in perturbative heterotic superstring. We give a detailed survey of all such models which is organized to aid analysis of their phenomenological properties. We compute tree level superpotentials for these models. These superpotentials are used to analyze the issues of proton stability (doublet–triplet splitting and R-parity-violating terms) and Yukawa mass matrices. To have agreement with phenomenological data all these models seem to require a certain degree of fine-tuning. We also analyze the possible patterns of supersymmetry breaking in these models. We find that the supersymmetry breaking scale comes out either too high to explain the electroweak hierarchy problem, or below the electroweak scale unless some degree of fine-tuning is involved. Thus, none of the models at hand seem to be phenomenologically flawless.
GRADED DIFFERENTIAL LIE ALGEBRAS AND SU(5)×U(1)-GRAND UNIFICATION
Authors: WULKENHAAR RAIMAR
Published: September 2003

We formulate the flipped SU(5)×U(1)-GUT within a Lie-algebraic approach to non-commutative geometry. It suffices to take the matrix Lie algebra su(5) as the input; the u(1)-part with its representation on the fermions is an algebraic consequence. The occurring Higgs multiplets (24, 5, 45, 50-representations of su(5)) are uniquely determined by the fermionic mass matrix and the spontaneous symmetry breaking pattern to SU(3)C×U(1)EM. We find the most general gauge invariant Higgs potential that is compatible with the given Higgs vacuum. Our formalism yields tree-level predictions for the masses of all gauge and Higgs bosons. It turns out that the low-energy sector is identical with the standard model. In particular, there exists precisely one light Higgs field, whose upper bound for the mass is 1.45 mt. All remaining 207 Higgs fields are extremely heavy.
SPECTRAL GEOMETRY AND CAUSALITY
Authors: KOPF TOMÁŠ
Published: September 2003

For a physical interpretation of a theory of quantum gravity, it is necessary to recover classical space–time, at least approximately. However, quantum gravity may eventually provide classical space–times by giving spectral data similar to those appearing in noncommutative geometry, rather than by giving directly a space–time manifold. It is shown that a globally hyperbolic Lorentzian manifold can be given by spectral data. A new phenomenon in the context of spectral geometry is observed: causal relationships. The employment of the causal relationships of spectral data is shown to lead to a highly efficient description of Lorentzian manifolds, indicating the possible usefulness of this approach.

Connections to free quantum field theory are discussed for both motivation and physical interpretation. It is conjectured that the necessary spectral data can be generically obtained from an effective field theory having the fundamental structures of generalized quantum mechanics: a decoherence functional and a choice of histories.
ON DUALITY AND REFLECTION FACTORS FOR THE SINH–GORDON MODEL WITH A BOUNDARY
Authors: CORRIGAN E.
Published: September 2003

The sinh–Gordon model with integrable boundary conditions is considered in low order perturbation theory. It is pointed out that results obtained by Ghoshal for the sine–Gordon breather reflection factors suggest an interesting dual relationship between models with different boundary conditions. Ghoshal's formula for the lightest breather is checked perturbatively to O(β2) in the special set of cases in which the ϕ→-ϕ symmetry is maintained. It is noted that the parametrization of the boundary potential which is natural for the semiclassical approximation also provides a good parametrizaiton at the "free-fermion" point.
FINITE GRAND UNIFIED THEORIES AND INFLATION
Authors: MUKAIGAWA S. , MUTA T. , ODINTSOV S. D.
Published: September 2003

A class of finite GUT's in curved space–time is considered in connection with the cosmological inflation scenario. It is confirmed that the use of the running scalar-gravitational coupling constant in these models helps realizing a successful chaotic inflation. The analyses are made for some different sets of the models.
THE LIENARD–WIECHERT POTENTIAL OF CHARGED SCALAR PARTICLES AND THEIR RELATION TO SCALAR ELECTRODYNAMICS IN THE REST-FRAME INSTANT FORM
Authors: ALBA DAVID , LUSANNA LUCA
Published: September 2003

After a summary of a recently proposed new type of instant form of dynamics (the Wigner-covariant rest-frame instant form), the reduced Hamilton equations in the covariant rest-frame Coulomb gauge for the isolated system of N scalar particles with pseudoclassical Grassmann-valued electric charges plus the electromagnetic field are studied. The Lienard–Wiechert potentials of the particles are evaluated and it is shown how the causality problems of the Abraham–Lorentz–Dirac equation are solved at the pseudoclassical level. Then, the covariant rest-frame description of scalar electrodynamics is given. Applying to it the Feshbach–Villars formalism, the connection with the particle plus electromagnetic field system is found.
LATTICE FORMULATION OF SUPERSYMMETRIC YANG–MILLS THEORIES WITHOUT FINE TUNING
Authors: MARU NOBUHITO , NISHIMURA JUN
Published: September 2003

We consider an application of the overlap formalism to supersymmetric Yang–Mills theory in three dimensions. We extend the overlap formalism for 3D Dirac fermion to Majorana fermion and show that the parity invariance is exactly preserved, which ensures that the continuum limit is supersymmetric without fine tuning. For SU (N) gauge group, N must be taken to be even in order to make the theory free from global gauge anomaly. We also discuss how to obtain two-dimensional super Yang–Mills theory from the 3D theory through dimensional reduction on the lattice.
QUARK-CLUSTERING EFFECTS IN NEUTRINO–NUCLEON DEEP INELASTIC SCATTERING
Authors: ANSELMINO M. , BARONE V. , CARUSO F. , CHEB-TERRAB E. , QUINTAIROS P. C. R.
Published: September 2003

The deep inelastic scattering of neutrinos on unpolarized nucleons is considered in a generalized parton model which takes into account quark-clustering effects, modeled by diquarks. The diquark contributions are expected to be significant at small Q2 values and to vanish asymptotically, and describe phenomenologically higher twist corrections. The most general case is studied, which includes both scalar and pseudovector diquarks inside the nucleons, as well as the contribution of scalar–vector and vector–scalar transitions. The resulting scaling violations are briefly discussed.
A VIEW OF THE TOP.
Authors: CHIARELLI GIORGIO
Published: September 2003

In this review I summarize the results obtained by CDF on top physics. After the discovery of the top quark, the efforts were concentrated on obtaining precision measurements of the observables. A description of the algorithms developed and used to isolate top in various samples is given, together with the discussion of background and selection strategies followed. The measurements of top mass and [Formula: see text] production cross section are discussed in detail and studies related to top decays and kinematics of [Formula: see text] events are presented.
DUALITY IN osp(1|2) CONFORMAL FIELD THEORY AND LINK INVARIANTS
Authors: ENNES I. P. , RAMALLO A. V. , SANCHEZ DE SANTOS J. M. , RAMADEVI P.
Published: September 2003

We study the crossing symmetry of the conformal blocks of the conformal field theory based on the affine Lie superalgebra osp(1|2). Within the framework of a free field realization of the osp(1|2) current algebra, the fusion and braiding matrices of the model are determined. These results are related in a simple way to those corresponding to the su(2) algebra by means of a suitable identification of parameters. In order to obtain the link invariants corresponding to the osp(1|2) conformal field theory, we analyze the corresponding topological Chern–Simons theory. In a first approach we quantize the Chern–Simons theory on the torus and, as a result, we get the action of the Wilson line operators on the supercharacters of the affine osp(1|2). From this result we get a simple expression relating the osp(1|2) polynomials for torus knots and links to those corresponding to the su(2) algebra. Further, this relation is verified for arbitrary knots and links by quantizing the Chern–Simons theory on the punctured two-sphere.
SOME COMMENTS ON THE DYNAMICS OF EXTENDED OBJECTS
Authors: KHANAL U.
Published: September 2003

A variational method is used to investigate the dynamics of extended objects. The stationary world volume requires the internal coordinates to propagate as free waves. Stationarity of the action which is the integral of a variable energy density over the world volume leads to the wave equation in a medium, with conductivity given by the gradient of the logarithm of reciprocal energy density, constant density corresponding to free space. The Einstein–Hilbert action for the world curvature gives an equation of motion which, in world space with the Einstein tensor proportional to the metric tensor, reduces to the free wave equation. A similar method applied to the action consisting of the surface area enclosing an incompressible world volume undergoing pure shear again yields the wave equation in a conducting medium. Simultaneous stationarity of the volume can be imposed with a stationary area only in the case of pure shear; stationary Einstein–Hilbert action can also be included and lead to an equation of motion which has a similar interpretation of the wave in the conducting medium. Some Green functions applicable to the medium with constant conductivity are also presented.
HOW TO TREAT γ5
Authors: CHENG HUNG , LI S. P.
Published: September 2003

In the past two decades, Dyson's formalism of renormalization has been mostly superceded by dimensional regularization, particularly in the treatment of quantum gauge field theories with spontaneous symmetry breaking or those with chiral fermions. In this paper, we shall carry out explicitly Dyson's subtraction program, making it applicable to such field theories. In particular, we show with the example of the Abelian–Higgs theory how to handle amplitudes of chiral fermions. We show that these amplitudes which involve the γ5 matrix can be calculated in an unambiguous and gauge invariant way. This is done by establishing the subtraction conditions for the propagator of a chiral fermion as well as those for the VVV amplitude, when V denotes the vector meson. The renormalized constants are chosen to satisfy the Ward–Takahashi identities. As a demonstration, we calculate the next-lowest order correction of the anomaly in the Abelian–Higgs model and find that it vanishes.
SUPERSYMMETRIC GENERALIZATION OF THE TENSOR MATTER FIELDS
Authors: LEMES V. E. R. , NOGUEIRA A. L. M. A. , HELAYËL-NETO J. A.
Published: September 2003

The supersymmetric generalization of a recently proposed Abelian axial gauge model with antisymmetric tensor matter fields is presented.
NONRELATIVISTIC LIMIT OF THE SCALAR CHERN–SIMONS THEORY AND THE AHARONOV–BOHM SCATTERING
Authors: GOMES M. , DA SILVA A. J. , MALBOUISSON J. M. C.
Published: September 2003

We study the nonrelativistic limit of the quantum theory of a Chern–Simons field minimally coupled to a scalar field with quartic self-interaction. The renormalization of the relativistic model, in the Coulomb gauge, is discussed. We employ a procedure to calculate scattering amplitudes for low momenta that generates their |p|/m expansion and separates the contributions coming from high and low energy intermediary states. The two-body scattering amplitude is calculated up to order p2/m2. It is shown that the existence of a critical value of the self-interaction parameter for which the two-particle scattering amplitude reduces to the Aharonov–Bohm one is a strictly nonrelativistic feature. The subdominant terms correspond to relativistic corrections to the Aharonov–Bohm scattering. A nonrelativistic reduction scheme and an effective nonrelativistic Lagrangian to account for the relativistic corrections are proposed.
VARIATIONAL CALCULATION OF LATTICE SU(N) GAUGE SYSTEMS FOR N=4~6
Authors: ZHENG XITE
Published: September 2003

A variational calculation scheme of SU (N) lattice gauge Wilson models for large but finite N is presented. The order parameter EP and the phase transition points of lattice SU (N) gauge systems for N=4~6 are calculated. The results are in good agreement with Monte Carlo simulations. An extrapolation procedure for determination of the phase transition point in the large N limit is proposed.
GENERATING SYMMETRY OPERATORS FOR THE KdV EQUATION AND SEEKING THEIR SUPERSYMMETRIC GENERALIZATIONS
Authors: BAGCHI B. , BECKERS J. , DEBERGH N.
Published: September 2003

Exploiting the Lax form of the Korteweg-de Vries equation, we determine the whole set of its symmetry operators and relate them to conserved quantities. We also study a KdV supersymmetric version and put in evidence its even (bosonic) and odd (fermionic) symmetries. We then get the Lie superalgebra characterizing this supersymmetric nonlinear equation.
SYMMETRIES OF THE BFKL EQUATION
Authors: MIKHAILOV A.
Published: September 2003

We discuss the algebraic structure of the spin chains related to high energy scattering in QCD. We study the sl(2) Yangian symmetry and possible generalizations to nonzero spin and anisotropy parameter.