bluuebunny/crossref_metadata_2025 huggingface dataset:
QUANTUM GLOBAL STRINGS AND THEIR CORRELATION FUNCTIONS
Authors: FORT H. , MARINO E. C.
Published: April 2003

A full quantum description of global vortex strings is presented in the framework of a pure Higgs system with a broken global U(1) symmetry in 3+1D. An explicit expression for the string creation operator is obtained, both in terms of the Higgs field and in the dual formulation where a Kalb–Ramond antisymmetric tensor gauge field is employed as the basic field. The quantum string correlation function is evaluated and from this, the string energy density is obtained. Potential application in cosmology (cosmic strings) and condensed matter (vortices in superfluids) are discussed.
POSSIBILITY OF FORMING A LARGE DCC IN ULTRA-RELATIVISTIC HEAVY-ION COLLISIONS
Authors: DIGAL SANATAN , RAY RAJARSHI , SENGUPTA SUPRATIM , SRIVASTAVA AJIT M.
Published: April 2003

We demonstrate the possibility of forming a single, large domain of disoriented chiral condensate (DCC) in a heavy-ion collision. In our scenario, rapid initial heating of the parton system provides a driving force for the chiral field, moving it away from the true vacuum and forcing it to go to the opposite point on the vacuum manifold. This converts the entire hot region into a single DCC domain. Subsequent rolling down of the chiral field to its true vacuum will then lead to emission of a large number of (approximately) coherent pions. The requirement of suppression of thermal fluctuations to maintain the (approximate) coherence of such a large DCC domain, favors three-dimensional expansion of the plasma over the longitudinal expansion even at very early stages of evolution. This also constrains the maximum temperature of the system to lie within a window. We roughly estimate this window to be about 200–400 MeV. These results lead us to predict that extremely high energy collisions of very small nuclei (possibly hadrons) are better suited for observing signatures of a large DCC. Another possibility is to focus on peripheral collisions of heavy nuclei.
DECAYS OF b HADRONS AND A POSSIBLE NEW FOUR-QUARK INTERACTION
Authors: VOLOSHIN M. B.
Published: April 2003

A possibility is considered of explaining the low experimental value of the ratio of the lifetimes τ(Λb)/τ (Bd) by a new "centiweak" four-quark interaction, i.e. with a strength on the order of 10-2GF. It is noted that the considered interaction can also improve agreement with the data on low semileptonic branching ratio B sl (B) in B meson decays with a simultaneous slight decrease in the prediction for the average charm yield in those decays. The proposed new interaction modifies within the present experimental limits the predictions for differences of lifetimes among B mesons, and can thus be probed by more precise data on these differences. A sample model is briefly discussed, where the new interaction arises through a weak SU(2) singlet scalar field with quantum numbers of a diquark.
TWO-DIMENSIONAL FRACTIONAL SUPERSYMMETRIC CONFORMAL FIELD THEORIES AND THE TWO-POINT FUNCTIONS
Authors: KHEIRANDISH FARDIN , KHORRAMI MOHAMMAD
Published: April 2003

A general two-dimensional fractional supersymmetric conformal field theory is investigated. The structure of the symmetries of the theory is studied. Then, applying the generators of the closed subalgebra generated by (L-1,L0,G-1/3) and [Formula: see text], the two-point functions of the component fields of supermultiplets are calculated.
Recent Charmonium Results from the Beijing Spectrometer Experiment
Authors:   (Representing the BES Collaboration), Harris Frederick A.
Published: April 2003

Recent results from the nearly 4.0 M BESI ψ(2S) event sample, the BESII ψ(2S) scan, and the recent BESII 25 M J/ψ sample are presented.
THE ENDPOINT REGION IN RADIATIVE QUARKONIA DECAYS
Authors: HAUTMANN F.
Published: April 2003

We consider the inclusive radiative decays quarkonium→ γ +hadrons and examine the effects of soft QCD radiation on the photon energy spectrum near the endpoint.
SPIN-PARITY ANALYSIS OF THE f1(1285)π± SYSTEM
Authors:   (On the behalf of E831/Focus Collaboration), CHO KIHYEON
Published: April 2003

Using data which had been taken at E831/FOCUS experiment during the Fermilab fixed target run (1996-1997), we have studied the f1(1285)π± system. The reaction is [Formula: see text] and [Formula: see text]. Using partial wave analysis, we have carried out a study of the spin-parity states of f1(1285)π± system including a search for exotic meson states.
NEW MESUREMENTS OF NUCLEON STRUCTURE FUNCTIONS FROM CCFR/NuTeV
Authors: Bodek A. , K. Yang U. , Adams T. , Alton A. , Arroyo C. G. , Avvakumov S. , de Barbaro L. , de Barbaro P. , Bazarko A. O. , Bernstein R. H. , Boltoen T. , Brau J. , Buchholz D. , Budd H. , Bugel L. , Conrad J. , Drucker R. B. , Fleming B. T. , Formaggio J. A. , Frey R. , Goldman J. , Goncharov M. , Harris D. A. , Johnson R. A. , Kim J. H. , King B. J. , Kinnel T. , Koutsoliotas S. , Lamm M. J. , Marsh W. , Mason D. , McFarland K. S. , McNulty C. , Mishra S. R. , Naples D. , Suwonjandee N. , Nienaber P. , Romoson A. , Sakumoto W. K. , Schellman H. , Sciulli F. J. , Seligman W. G. , Shaevitz M. H. , Smith W. H. , Spentzouris P. , Stern E. G. , Vakili M. , Vaitaitis A. , Yu J. , Zeller G. P. , Zimmerman E. D.
Published: April 2003

We report on the extraction of the structure functions F2 and [Formula: see text] from CCFR νμ-Fe and [Formula: see text]-Fe differential cross sections. The extraction is performed in a physics model independent (PMI) way. This first measuremant for ΔxF3, which is useful in testing models of heavy charm production, is higher than current theoretical predictions. Within 5% the F2 (PMI) values measured in νμ and μ scattering are in agreement with the predictions of Next-to-Leading-Order PDFs (using massive charm production schemes), thus resolving the long-standing discrepancy between the two measurements.
BFKL PHYSICS IN JET PRODUCTION AT e+e- COLLIDERS
Authors: ORR LYNNE H. , STIRLING W. J.
Published: April 2003

Virtual photon scattering in e+e- collisions can result with the electron-positron pair at large rapidity separation with hadronic activity in between. The BFKL equation resums large logarithms that dominate the cross section for this process. We report here on a Monte Carlo method for solving the BFKL equation that allows kinematic constraints to be taken into account and show results for e+e- collisions.
Production of π±, K±, p and $\bar p$ in Quark, Antiquark and Gluon Jets
Authors:   Representing the SLD Collaboration, Kang Hyejoo
Published: April 2003

We present measurements of identified charged hadron production over a wide momentum range using the SLD Cherenkov Ring Imaging Detector. In addition to studying flavor-inclusive Z0 decays, we compare particle production in decays into light, c and b flavors and compare production in gluon jets with that in light quark jets, where the jet flavors are selected using precision vertex information.
THE UNDERLYING EVENT IN LARGE TRANSVERSE MOMENTUM CHARGED JET AND Z-BOSON PRODUCTION
Authors:   (for the CDF Collaboration), FIELD RICK
Published: April 2003

We study the behavior of the underlying event in large transverse momentum charged jet and Z-boson production at 1.8 TeV and compare with the QCD Monte-Carlo models. The data indicate that neither ISAJET or HERWIG produce enough charged particles (with pT > 0.5 GeV/c) from the "beam-beam remnant" component and that ISAJET produces too many charged particles from initial-state radiation. PYTHIA whic uses multiple parton scattering to enchance the underlying event does the best job describing the data
STUDY OF JET ENERGY RESOLUTION AT CDF
Authors: BOCCI A. , KUHLMANN S. , LAMI S. , LATINO G.
Published: April 2003

The jet energy resolution comes from many sources, which can be grouped into two categories: (1) detector effects such as calorimeter resolution, and (2) physics effects such as fluctuations in the energy outside a clustering cone. For the detector resolution we used both CDF detector simulation and data. For the first time the full granularity of the CDF detector is used to perform corrections at "tower level" rather than at "jet level". The track momenta measured by the Central Tracking Chamber and the neutral cluster energies measured by the Central Shower Max are used to correct the calorimeter tower energies. When tested on γ + jet data, our new algorithm has shown an improvement on the jet energy resolution better than 20% compared to the standard CDF jet corrections.
PROBING NEUTRAL GAUGE BOSON SELF-INTERACTIONS IN ZZ PRODUCTION AT THE TEVATRON
Authors: BAUR U. , RAINWATER D.
Published: April 2003

We present an analysis of ZZ production at the upgraded Fermilab Tevatron for general ZZZ and ZZγ couplings. Achievable limits on these couplings are shown to be a significant improvement over the limits currently obtained by LEP II.
ELECTROWEAK RADIATIVE CORRECTIONS TO OFF-SHELL W-PAIR PRODUCTION
Authors: DENNER ANSGAR , DITTMAIER STEFAN , ROTH MARKUS , WACKEROTH DOREEN
Published: April 2003

We briefly describe the RacoonWW approach to calculate radiative corrections to e + e - → WW → 4f and present numerical results for the total W-pair production cross section at LEP2.
PRELIMINARY MEASUREMENTS OF THE QUARK-ANTIQUARK PRODUCTION CROSS-SECTION IN E+E- ANNIHILATIONS UP TO LEP2 HIGHEST ENERGIES
Authors: DELLA RICCA GIUSEPPE
Published: April 2003

Data collected with the DELPHI detector at [Formula: see text] up to LEP2 highest energies (i.e. exceeding 205 GeV) have been used to extract preliminary values of the cross-sections for quark-antiquark pair-production in e + e - annihilations. The values found were used to test the Standard Model predictions and to seek for physics beyond it.
NUMERICAL ASPECTS OF BUBBLE NUCLEATION
Authors: SEUNARINE SURUJHDEO , MCKAY DOUGLAS W.
Published: April 2003

Bubble nucleation has been studied on lattices using phenomenological Langevin equations. Recently there have been theoretical motivations for using these equations. These studies also conclude that the simple Langevin description requires some modification. We study bubble nucleation on a lattice and determine effects of the modified Langevin equations.
HIGHER-FOCK STATES AND THE COVARIANCE OF THE LIGHT-FRONT QUARK MODEL
Authors: CHOI HO-MEOYNG , JI CHUENG-RYONG
Published: April 2003

The light-front quark model has been successful in describing various meson properties. We apply the model to the meson weak decays and discuss the covariance of the model. We find that the inclusion of the higher-Fock state (i.e. nonvalence or so called Z-graph) contributions is necessary to recover the covariance of the light-front quark model. We present the possibility of the effective calculation of the higher-Fock state contributions to restore the covariance in the light-front model.
TOP QUARK TOTAL AND DIFFERENTIAL CROSS SECTIONS AT NNLO AND NNLL
Authors: KIDONAKIS NIKOLAOS
Published: April 2003

I present recent NNLO-NNLL results for top quark hadroproduction at the Tevatron. The total cross section as well as transverse momentum and rapidity distributions are shown.
TOP PRODUCTION AND DECAY AT LINEAR COLLIDERS: QCD CORRECTIONS
Authors: MACESANU COSMIN , ORR LYNNE H.
Published: April 2003

We present the results of an exact calculation of gluon radiation in top production and decay at high energy electron-positron colliders. We include all spin correlations and interferences, the bottom quark mass, and finite top width effects in the matrix element calculation. We study properties of the radiated gluons and implications for top mass measurement. We also discuss virtual corrections to the process.
Fully Differential QCD Corrections to Single Top Quark Final States
Authors: Harris B. W. , Laenen E. , Phaf L. , Sullivan Z. , Weinzierl S.
Published: April 2003

A new next-to-leading order Monte Carlo program for calculation of fully differential single top quark final states is described and first results presented. Both the s- and t-channel contributions are included.
MEASUREMENT OF Δmd USING A PROBABILITY BASED SAME-SIDE TAGGER APPLIED TO LEPTON+VERTEX EVENTS
Authors:   (Representing the CDF Collaboration), BAUER G.
Published: April 2003

A measurement of Δmd is performed using inclusive lepton+vertex events at CDF. A probability based Same-Side Tagger was developed to tag the initial b-flavor of the [Formula: see text], which suppresses tagging on B-decay products. We find Δmd = 0.42 ± 0.09 ± 0.03 ps -1.
b Decay Charm Counting Via Topological Vertexing
Authors:   Representing the SLD Collaboration, CHOU AARON S.
Published: April 2003

We present a new and unique measurement of the branching fractions of b hadrons to states with 0, 1 and 2 open charm hadrons, using a sample of 350,000 Z's collected during the SLD/SLC 97-98 run. The analysis takes advantage of the excellent vertexing resolution of the VXD3, a pixel-based CCD vertex detector, which allows the separation of B and cascade D decay vertices. Analysis of the decay length distributions for each of the 1-, 2-, and 3-vertex topologies allows the extraction of the inclusive branching fractions. We measure: BR(b → 0D) =5.6% ± 1.1%(stat.) ± 2.0%(syst.), BR(b → 2D)= 24.6% ± 1.4%(stat.)± 4.0%(syst.) (preliminary), where b and D represent mixtures of open b and open c hadrons.
B DECAYS TO FINAL STATES INCLUDING $D^{(*)}_s$ AND D*
Authors:   representing the BABAR Collaboration, BRAU BENJAMIN
Published: April 2003

The e+e- annihilation data recorded with the BABAR detector has been used to study B decays to [Formula: see text] and D*± mesons. The production fraction of inclusive [Formula: see text] and the corresponding momentum spectra have been determined. Exclusive decays [Formula: see text] have been identified with a partial reconstruction technique and their branching fractions have been measured. We also report branching fraction measurements for the exclusive hadronic modes B0 → D*- π+ and B0 → D*- ρ+.
SEARCH FOR B+ → K+ℓ+ℓ- AND B0 → K*+ℓ+ ℓ-
Authors:   For the BABAR Collaboration, KUZNETSOVA NATALIA
Published: April 2003

Using a sample of [Formula: see text] events collected with the BABAR detector at the PEP-II storage ring, we search for the electroweak penguin decays B+→ K+e+e-, B+→ K+μ+μ-, B0→K*0e+e-, and B0→ K*0μ+μ-. We observe no significant signals for these modes and set preliminary 90% C.L. upper limits of [Formula: see text]
ON THE QCD SUM RULE DETERMINATION OF THE STRANGE QUARK MASS
Authors: PAVER NELLO
Published: April 2003

I briefly review recent QCD Sum Rules determinations of the strange current quark mass, based on the analysis of the two-point ΔS=1 scalar correlators and discuss, in particular, the role of resonances and non-resonant background in the spectral function.
A SEARCH FOR B→τν
Authors:   Speaking on behalf of the CLEO Collaboration., THAYER JOHN GREGG
Published: April 2003

We report results of a search for B→τν in a sample of 9.7 million charged B meson decays. The search uses both πν and [Formula: see text] decay modes of the τ, and demands exclusive reconstruction of the companion [Formula: see text] decay to suppress background. We set an upper limit on the branching fraction ℬ(B→τν)<8.4×10-4 at 90% confidence level. With slight modification to the analysis we also establish [Formula: see text] at 90% confidence level.
MODEL INDEPEDENT EXTRACTIONS OF |Vub| FROM INCLUSIVE B DECAYS
Authors: LOW IAN
Published: April 2003

We discuss the possibility of extracting |Vub| from various spectra of inclusive B decays, without large systematic errors which usually arise from having to model the Fermi motion of the heavy quark. This strategy can be applied to the electron energy spectrum, as well as the hadronic mass spectrum. Modulo violation of local hadron-parton duality, the theoretical error in the extraction is estimated to be less than 10%.
KTeV Search for the Lepton-Flavor Violating Decay π0→μ±e∓
Authors:   for the KTeV Collaboration, Wolfe Collin
Published: April 2003

KTeV (Kaons at the Tevatron) experiment E799 Phase II at Fermilab has been using data collected in 1997 to study rare kaon and π0 decays. Included in the study is the search for the lepton-flavor violating mode π0→μ±e∓, where the π0's are tagged from [Formula: see text] decays. We establish a new, preliminary limit BR (π0→μ±e∓)<7.85×10-10.
SEARCH FOR DIRECT CP VIOLATION IN HYPERON DECAYS
Authors:   Representing the Fermilab HyeprCP collaboration: R. A. Burstein, A. Chakravorty, D. M. Kaplan, L.M. Lederman, W. Luebke, D. Rajaram, H.A. Rubin, C. G. White, S.L. White, Illinois Institute of Technology, A. Chan, Y. C. Chen, C. Ho, P. K. Teng, Academica Sinica, W. S. Choong, G. Gidal, T. Jones, K. B. Luk, Lawrence Berkely National Laboratory and University of California, K. Clark, M. Jenkins, University of South Alabama, E. C. Dukes, C. Durandet, T. Holmstrom, M. Huang, L. Lu, K. Nelson, University of Virg, Zyla P.
Published: April 2003

Fermilab experiment E871, HyperCP, is designed to search for evidence of direct CP violation in Cascade and Lambda hyperon decays. The asymmetry of the angular distribution of the proton in the Lambda helicity frame between Ξ-→Λ+π-, Λ→p+π- and the charge-conjugate decays, will be measured. During the 1997 and 1999 fixed target runs at Fermilab HyperCP collaboration collected billions of Cascade and anti-Cascade decays that would make it possible to probe this asymmetry at the 10-4 statistical level. The status of the data analysis is described.
ECONOMIC MODEL FOR NEUTRINO MASSES AND MIXINGS
Authors: FRAMPTON PAUL H.
Published: April 2003

Working in the framework of three chiral neutrinos with Majorana masses, we investigate a scenario where the neutrino mass matrix is strictly off-diagonal in the flavor basis, with all its diagonal entries precisely zero.
CONSTRAINTS ON NEUTRINO OSCILLATION PARAMETERS FROM TIME/ENERGY DEPENDENCE OF SOLAR 8B NEUTRINO FLUX
Authors:   For the SUPER-KAMIOKANDE COLLABORATION., SMY MICHAEL B
Published: April 2003

A search for neutrino oscillation is presented using time variations and energy dependence of the observed reduction of the solar neutrino flux. No significant time variation or energy dependence has been found in 1117 days of solar neutrino data taken with the Super-Kamiokande experiment. This constrains the two-neutrino oscillation parameter space independently of the model dependence of the solar neutrino flux. The combination of Super-Kamiokande's data of the day-night variation, energy dependence and flux results in two allowed regions at 95% C.L.
MONOLITH: A MASSIVE MAGNETIZED TRACKING CALORIMETER FOR THE STUDY OF ATMOSPHERIC NEUTRINO OSCILLATIONS
Authors:   On behalf of the MONOLITH collaboration: Bologna, Bonn, CNR Torino, Columbia, LNF Frascati, Hamburg, Humboldt Berlin, INR Moscow, L'Aquila, LNF Frascati, LNGS Gran Sasso, MEPhI Moscow, Milano, Münster, Napoli, Roma, Stockholm, Tunis, Torino., TERRANOVA FRANCESCO
Published: April 2003

MONOLITH is a proposed massive (34 kton) magnetized tracking calorimeter at the Gran Sasso laboratory in Italy, optimized for the detection of high energy atmospheric muon neutrinos. The main goal is to establish (or reject) the neutrino oscillation hypothesis through an explicit observation of the full first oscillation swing. The Δm2 sensitivity range for this measurement comfortably covers the complete Super-Kamiokande allowed region. Other measurements include studies of matter effects and the up/down ratio of NC events, the study of cosmic ray muons in the multi-TeV range, and auxiliary measurements from the CERN to Gran Sasso neutrino beam.
Recent Results from the Palo Verde Neutrino Oscillation Experiment
Authors:   For the Palo Verde Collaboration: F. Boehm, B. Cook, H. Henrikson, K. B. Lee, V. Novikov, A. Piepke, P. Vogel, Caltech; J. Busenitz, J. Kornis, K. McKinny, J. Wolf, University of Alabama; G. Gratta, L. Miller, D. Tracy, Y-F. Wang, Stanford University; B. Ritchie, D. Lawrence, Arizona State University., Wang Yi Fang
Published: April 2003

The [Formula: see text] flux and spectrum have been measured at a distance of about 800 m from the reactors of the Palo Verde Nuclear Generating Station using a segmented Gd-loaded liquid scintillator detector. Results from the experiment show no evidence for neutrino oscillation. [Formula: see text] oscillation were excluded at 90% CL for Δm2>1.12×10-3 eV 2 for full mixing, and sin 2 2θ>0.21 for large Δm2. These results support the conclusion that the observed atmospheric neutrino oscillation does not involve νe.
SEARCH FOR R-PARITY VIOLATING DECAYS OF SUPERSYMMETRIC PARTICLES AT LEP
Authors: PÁSZTOR GABRIELLA
Published: April 2003

Searches for pair-produced charginos neutralinos and scalar fermions decaying via R-parity violating λ, λ′ and λ′′ couplings with the OPAL detector at LEP are presented at [Formula: see text]. Partial updates using data up to the highest energies of LEP, [Formula: see text], are also given.
Prospects for Higgs Searches at CDF in Run II
Authors:   Representing the CDF Collaboration., HUGHES RICHARD E.
Published: April 2003

The prospects for standard model Higgs searches in Run II using the CDF Detector are summarized.
HIGGS PHYSICS AT THE LHC
Authors: ZEPPENFELD DIETER
Published: April 2003

A SM-like Higgs boson can be produced in a variety of channels at the LHC. By combining information from production via gluon fusion and weak boson fusion, various partial widths and the total Higgs boson width can be extracted. Expected accuracies for 200 fb -1 of data are in the 10% range.
CHARGED HIGGS EFFECTS IN CHARGED KAON AND TAU DECAYS
Authors: TOWERS S.
Published: April 2003

From an analysis of the current world averages of the τ-→νK- and charged kaon leptonic branching fractions, a competitive indirect limit on tan β/m H is derived in the framework of type II Higgs doublet models, such as the MSSM.
SEARCH FOR CHARGED HIGGS BOSONS IN E+E- COLLISIONS AT LEP AT THE DELPHI EXPERIMENT
Authors:   On behalf of the DELPHI collaboration., Gómez-Ceballos G.
Published: April 2003

A search for pair produced charged Higgs bosons was performed in the high energy data collected by the DELPHI detector at LEP II at centre-of-mass energies from 183 GeV to 208 GeV. The three different final states, τντν, [Formula: see text] and [Formula: see text] were considered. No excess of data compared to the expected Standard Model processes was observed and the existence of a charged Higgs boson with mass lower than 75.0 GeV / c 2 is excluded at 95% confidence level.
SINGLE SPARTICLE AND LEPTOQUARK PRODUCTION IN e+e- COLLISIONS UP TO $\sqrt{s} = 202~GeV$ WITH THE DELPHI DETECTOR
Authors: PAPADOPOULOU THEODORA D.
Published: April 2003

Searches for single sparticle productions occuring in R-violating supersymmetry, have been performed, using the data collected by the DELPHI detector at LEP up to [Formula: see text]. In particular, the resonant sneutrino production and subsequent decay to a single chargino or neutralino are studied, and limits on the R-parity violating couplings, at 95% CL, are presented. Relevant aspects on the R-violating squark and on a scalar Leptoquark single production are given.

A direct search for the single production of scalar and vector Leptoquarks has been performed and limits are derived on the masses and couplings of the Leptoquark states within two different frameworks, based on the direct (pertubative) and the resolved photon contribution.
VIRASORO ALGEBRA AND O(N)σ-MODEL
Authors: PACHOS JIANNIS
Published: April 2003

Within the framework of a local expansion of the logarithm of the O (N)σ-model vacuum functional, valid for slowly varying fields, the modified Virasoro algebra is studied. The operatorlike central charge term is given, up to second order, for a general functional.
N = 2 MAXWELL–CHERN–SIMONS MODEL WITH ANOMALOUS MAGNETIC MOMENT COUPLING VIA DIMENSIONAL REDUCTION
Authors: CHRISTIANSEN H. R. , CUNHA M. S. , HELAYËL-NETO J. A. , MANSSUR L. R. U. , NOGUEIRA A. L. M. A.
Published: April 2003

An N = 1-supersymmetric version of the Cremmer–Scherk–Kalb–Ramond model with nonminimal coupling to matter is built up both in terms of superfields and in a component-field formalism. By adopting a dimensional reduction procedure, the (N = 2)-(D = 3) counterpart of the model comes out, with two main features: a genuine (diagonal) Chern–Simons term and an anomalous magnetic moment coupling between matter and the gauge potential.
THE SCALING HYPOTHESES FOR SINGLE SPIN ASYMMETRY IN INCLUSIVE HADRON PRODUCTION
Authors: ANDREEVA E. A. , OKOROKOV V. A. , STRIKHANOV M. N. , NURUSHEV S. B.
Published: April 2003

Recently several scaling hypotheses were advocated for application to the single spin asymmetry in inclusive hadron production at high energy. We briefly review those hypotheses and confront them with published experimental data. We conclude that the existing data do not allow to make a firm conclusion on any of scaling laws proposed and more precise data with a wide kinematical coverage are required to establish or refute those hypotheses.
CURRENT OSCILLATIONS, INTERACTING HALL DISCS AND BOUNDARY CFTs
Authors: BALACHANDRAN A. P. , VAIDYA S. , BIMONTE G. , GOVINDARAJAN T. R. , GUPTA K. S. , JOHN V.
Published: April 2003

In this paper, we discuss the behavior of conformal field theories interacting at a single point. The edge states of the quantum Hall effect (QHE) system give rise to a particular representation of a chiral Kac–Moody current algebra. We show that in the case of QHE systems interacting at one point we obtain a "twisted" representation of the current algebra. The condition for stationarity of currents is the same as the classical Kirchoff's law applied to the currents at the interaction point. We find that in the case of two discs touching at one point, since the currents are chiral, they are not stationary and one obtains current oscillations between the two discs. We determine the frequency of these oscillations in terms of an effective parameter characterizing the interaction. The chiral conformal field theories can be represented in terms of bosonic Lagrangians with a boundary interaction. We discuss how these one-point interactions can be represented as boundary conditions on fields, and how the requirement of chirality leads to restrictions on the interactions described by these Lagrangians. By gauging these models we find that the theory is naturally coupled to a Chern–Simons gauge theory in 2+1 dimensions, and this coupling is completely determined by the requirement of anomaly cancellation.
PREPOTENTIALS, BILINEAR FORMS ON PERIODS AND ENHANCED GAUGE SYMMETRIES IN TYPE II STRINGS
Authors: MASUDA TAKAHIRO , SUZUKI HISAO
Published: April 2003

We construct a bilinear form on the periods of Calabi–Yau spaces. This is used to obtain the prepotentials around conifold singularities in type II strings compactified on Calabi–Yau space. Explicit construction of the bilinear forms is achieved for the one-modulus models as well as two-modulus models with K3 fibrations where the enhanced gauge symmetry is known to be observed at the conifold locus. We also show how these bilinear forms are related with the existence of flat coordinates. We list the resulting prepotentials in two-modulus models around the conifold locus, which contains α′ corrections of 4D N=2 SUSY SU(2) Yang–Mills theory as the stringy effect.
CONSTRUCTION OF AN IDENTICALLY NILPOTENT BRS CHARGE IN THE KATO–OGAWA STRING THEORY
Authors: ABE MITSUO , NAKANISHI NOBORU
Published: April 2003

In previous work, the conformal-gauge two-dimensional quantum gravity in the BRS formalism has been solved completely in terms of Wightman functions. In the present paper, this result is extended to the closed and open bosonic strings of finite length; the open-string case is nothing but the Kato–Ogawa string theory. The field-equation anomaly found previously, which means a slight violation of a field equation at the level of Wightman functions, remains existent in the finite-string cases. By using this fact, a BRS charge nilpotent even for D≠26 is explicitly constructed in the framework of the Kato–Ogawa string theory. The FP-ghost vacuum structure of the Kato–Ogawa theory is made more transparent; the appearance of half-integral ghost numbers and the artificial introduction of an indefinite metric are avoided.
RADIATIVE EFFECTS AND ELECTROWEAK SYMMETRY BREAKING IN A SUPERSYMMETRIC PREON MODEL
Authors: KIM JONGBAE
Published: April 2003

We construct the low energy effective theory of composite quarks, leptons, and Higgs bosons for a supersymmetric preon model and study the effects of renormalization-group based radiative corrections. The study on the evolution of scalar masses for avoiding color and charge breakings leads us to conclude that Yukawa couplings are bounded from above. The implementation of electroweak symmetry breaking requires that only the purely dynamical symmetry breaking should be needed for the model, but the combined scheme of dynamical and radiative symmetry breaking as well as the purely radiative symmetry breaking scheme be disfavored. Our analysis of [Formula: see text] including radiative effects shows that, should a discrepancy be found between the observed and the theoretical value of [Formula: see text] after experimental determination of supersymmetric particle masses, it would imply that the complete quark–lepton universality in the supersymmetric preon model does not hold either for the Yukawa couplings, or for the condensates, or for both.
EFFECTS OF GAUGING ON SYMPLECTIC STRUCTURE, THE HOPF TERM COUPLED TO THE CP1 MODEL, AND FRACTIONAL SPIN
Authors: CHAKRABORTY B. , MAJUMDAR A. S.
Published: April 2003

We couple the Hopf term to the relativistic CP 1 model and carry out the Hamiltonian analysis at the classical level in a gauge-independent manner. The symplectic structure of the model given by the set of Dirac brackets among the phase space variables is found to be the same as that of the pure CP 1 model. This symplectic structure is shown to be inherited from the global SU(2)-invariant S3 model, and undergoes no modification upon gauging the U(1) subgroup, except for the appearance of an additional first class constraint generating U(1) gauge transformation. We then address the question of fractional spin as imparted by the Hopf term at the classical level. For that we construct the expression of angular momentum through both the symmetric energy–momentum tensor and Noether's prescription. The two expressions agree for the model, indicating that no fractional spin is imparted by this term at the classical level in an approach which is different from the earlier analyses carried out in the literature. We next show that the model has to be altered à la Bowick et al., by using an identity (which is not a constraint as it involves a time derivative and thus changes the basic dynamical structure of the model) valid in the radiation gauge in order to yield the fractional spin given in terms of the soliton number. Finally, by making the gauge field of the CP 1 model dynamical by adding the Chern–Simons term, we find that the model ceases to be a CP 1 model, as is the case with its nonrelativistic counterpart. This model is also shown to reveal the existence of "anomalous" spin. This is, however, given in terms of the total charge of the system, rather than any soliton number.
HEAVY FLAVOR CONSERVING RADIATIVE DECAYS OF HEAVY MESONS
Authors: MOHANTA R. , GIRI A. K.
Published: April 2003

The radiative decays of heavy mesons are studied in the heavy quark symmetry formalism. Assuming the traditional picture of photon emission by the confined quark or antiquark, we obtain the transition matrix elements for the heavy quark current sector. For the light quark sector we employ the ISGW quark model. The results obtained agree reasonably well with other estimations.
A CLASSICAL ISODUAL THEORY OF ANTIMATTER AND ITS PREDICTION OF ANTIGRAVITY
Authors: SANTILLI RUGGERO MARIA
Published: April 2003

An inspection of the contemporary physics literature reveals that, while matter is treated at all levels of study, from Newtonian mechanics to quantum field theory, antimatter is solely treated at the level of second quantization. For the purpose of initiating the restoration of full equivalence in the treatment of matter and antimatter in due time, and as the classical foundations of an axiomatically consistent inclusion of gravitation in unified gauge theories recently appeared elsewhere, in this paper we present a classical representation of antimatter which begins at the primitive Newtonian level with corresponding formulations at all subsequent levels. By recalling that charge conjugation of particles into antiparticles is antiautomorphic, the proposed theory of antimatter is based on a new map, called isoduality, which is also antiautomorphic (and more generally, antiisomorphic), yet it is applicable beginning at the classical level and then persists at the quantum level where it becomes equivalent to charge conjugation. We therefore present, apparently for the first time, the classical isodual theory of antimatter, we identify the physical foundations of the theory as being the novel isodual Galilean, special and general relativities, and we show the compatibility of the theory with all available classical experimental data on antimatter. We identify the classical foundations of the prediction of antigravity for antimatter in the field of matter (or vice-versa) without any claim on its validity, and defer its resolution to specifically identified experiments. We identify the novel, classical, isodual electromagnetic waves which are predicted to be emitted by antimatter, the so-called space–time machine based on a novel non-Newtonian geometric propulsion, and other implications of the theory. We also introduce, apparently for the first time, the isodual space and time inversions and show that they are nontrivially different than the conventional ones, thus offering a possibility for the future resolution whether far away galaxies and quasars are made up of matter or of antimatter. The paper ends with the indication that the studies are at their first infancy, and indicates some of the open problems. To avoid a prohibitive length, the paper is restricted to the classical treatment, while studies on operator profiles are treated elsewhere.
HETEROTIC T-DUALITY AND THE RENORMALIZATION GROUP
Authors: OLSEN KASPER , SCHIAPPA RICARDO
Published: April 2003

We consider target space duality transformations for heterotic sigma models and strings away from renormalization group fixed points. By imposing certain consistency requirements between the T-duality symmetry and renormalization group flows, the one-loop gauge beta function is uniquely determined, without any diagram calculations. Classical T-duality symmetry is a valid quantum symmetry of the heterotic sigma model, severely constraining its renormalization flows at this one-loop order. The issue of heterotic anomalies and their cancellation is addressed from this duality constraining viewpoint.
QUANTIZATION OF CONFORMAL FIELDS IN THREE-DIMENSIONAL ANTI-DE SITTER BLACK HOLE SPACE–TIME
Authors: KIM HONGSU , AHN CHANGRIM , OH JAE-SOK
Published: April 2003

Utilizing the conformal-flatness nature of three-dimensional Anti-de Sitter ( AdS 3) black hole solution of Banados, Teitelboim and Zanelli, the quantization of conformally-coupled scalar and spinor fields in this background space–time is explicitly carried out. In particular, mode expansion forms and propagators of the fields are obtained in closed forms. The vacuum in this conformally-coupled field theories in AdS 3 black hole space–time, which is conformally-flat, is the conformal vacuum which is unique and has global meaning. This point particularly suggests that now the particle production by AdS 3 black hole space–time should be absent. General argument establishing the absence of real particle creation by AdS 3 black hole space–time for this case of conformal triviality is provided. Then next, using the explicit mode expansion forms for conformally-coupled scalar and spinor fields, the bosonic and fermionic superradiances are examined and found to be absent confirming the expectation.
WEAK FIELD EXPANSION OF GRAVITY: GRAPHS, MATRICES AND TOPOLOGY
Authors: ICHINOSE SHOICHI , IKEDA NORIAKI
Published: April 2003

We present some approaches to the perturbative analysis of the classical and quantum gravity. First we introduce a graphical representation for a global SO (n) tensor (∂)dhαβ, which generally appears in the weak field expansion around the flat space: gμν=δμν+hμν. Making use of this representation, we explain (1) Generating function of graphs (Feynman diagram approach), (2) Adjacency matrix (Matrix approach), (3) Graphical classification in terms of "topology indices" (Topology approach), (4) The Young tableau (Symmetric group approach). We systematically construct the global SO (n) invariants. How to show the independence and completeness of those invariants is the main theme. We explain it taking simple examples of ∂∂h-, and (∂∂h)2-invariants in the text. The results are applied to the analysis of the independence of general invariants and (the leading order of) the Weyl anomalies of scalar-gravity theories in "diverse" dimensions (2,4,6,8,10 dimensions).
THE GREEN–SCHWARZ TYPE FORMULATION OF D=11S-INVARIANT SUPERSTRING AND SUPERPARTICLE ACTIONS
Authors: DERIGLAZOV A. A. , GITMAN D. M.
Published: April 2003

The manifestly Poincaré-invariant formulations for SO(1,10) and SO(2,9) superstring actions are proposed. The actions are invariant under a local fermionic κ-symmetry as well as under a number of global symmetries, which turn out to be on-shell realization of the known "new supersymmetry" S-algebra. Canonical quantization of the theory is performed and the relation of the quantum state spectrum with that of type IIA Green–Schwarz superstring is discussed. Besides, a mechanical model is constructed, which is a zero tension limit of the D=11 superstring and which incorporates all essential features of the latter. A corresponding action invariant under off-shell closed realization of the S-algebra is obtained.
BARYOGENESIS THROUGH GRADUAL COLLAPSE OF VORTONS
Authors: MASPERI LUIS , ORSARIA MILVA
Published: April 2003

We evaluate the matter–antimatter asymmetry produced by emission of fermionic carriers from vortons which are assumed to be destabilized at the electroweak phase transition. The velocity of contraction of the vorton, calculated through the decrease of its magnetic energy, originates a chemical potential which allows a baryogenesis of the order of the observed value. This asymmetry is not diluted too much by reheating if the collapse of vortons is distributed along an interval of ~ 10-10 sec.
NEUTRINO MIXING WITH NEW HEAVY PARTICLES IN THE SU(6)L ⊗ U(1)Y MODEL
Authors: GAITÁN R. , RODRIGUEZ-ROMO S. , HERNÁNDEZ-GALEANA A. , RIVERA-REBOLLEDO J. M.
Published: April 2003

We analyze the effects arisen from the mixing of heavy neutral fermions with the standard neutrinos in the SU (6)L ⊗ U (1)Y model. We obtain limits on the mixing angles between νe, νμ, ντ and the heavy neutral fermions of the model; these results are consistents with those predicted by using certain experimental constraints. This model also gives values for [Formula: see text], for the first row of the CKM matrix and for the invisible decay rate of the Z boson; its close agreement with the experimental data is shown. This behavior is expected since the standard neutrinos only mix with the exotic neutral leptons of the model which acquire mass in the first stage of SSB.
ALTERNATIVE LAX PAIR, BI-HAMILTONIAN STRUCTURE, AND CONSTRAINED FLOWS FOR THE ψ-DYNAMIC OF NLS EQUATION
Authors: DAS CHANDAN KR. , CHOWDHURY A. ROY
Published: April 2003

Nonlinear equations describing the ψ-dynamics of the NLS problem are analyzed with the help of small amplitude expansion and Fourier analysis. An alternative form of Lax problem is deduced which is a (2×2) matrix function in contrast to the (3×3) form suggested by Dodd. et al. We also derive the form of the implectic operators giving bi-Hamiltonian structure. Lastly, the Bargmann type constraint is shown to yield nonlinear dynamical systems which is also integrable in the Liouville sense.
EXPLICITLY SPACE- AND TIME-DEPENDENT D'ALEMBERT EQUATIONS WITH SYMMETRIES
Authors: EULER MARIANNA , EULER NORBERT , LINDBLOM OVE
Published: April 2003

The general d'Alembert equation □u + f (x0, x1, u) = 0 is considered, where □ is the two-dimensional d'Alembert operator. We classify the equation for functions f by which it admits several Lie symmetry algebras, which include the Lorentz symmetry generator. The corresponding symmetry reductions are listed.
QUARK MASS HIERARCHY IN THE SUPERSYMMETRIC COMPOSITE MODEL
Authors: KITAZAWA NORIAKI
Published: April 2003

A mechanism to have the quark mass hierarchy in the supersymmetric composite model is proposed. The source of the hierarchy is the kinetic-term mixing between composite quarks. Such mixing can be expected, if quarks are composite particles. A model in which the mechanism works is constructed, although it is not perfectly realistic because of some assumptions and unnaturalness.
INFINITE-DIMENSIONAL FREE ALGEBRA AND THE FORMS OF THE MASTER FIELD
Authors: HALPERN M. B. , SCHWARTZ C.
Published: April 2003

We find an infinite-dimensional free algebra which lives at large N in any SU (N)-invariant action or Hamiltonian theory of bosonic matrices. The natural basis of this algebra is a free-algebraic generalization of Chebyshev polynomials and the dual basis is closely related to the planar connected parts. This leads to a number of free-algebraic forms of the master field including an algebraic derivation of the Gopakumar–Gross form. For action theories, these forms of the master field immediately give a number of new free-algebraic packagings of the planar Schwinger–Dyson equations.
DIRAC FIELDS IN THE BACKGROUND OF A MAGNETIC FLUX STRING AND SPECTRAL BOUNDARY CONDITIONS
Authors: BENEVENTANO C. G. , DE FRANCIA M. , SANTANGELO E. M.
Published: April 2003

We study the problem of a Dirac field in the background of an Aharonov–Bohm flux string. We exclude the origin by imposing spectral boundary conditions at a finite radius then shrinked to zero. Thus, we obtain a behavior of the eigenfunctions which is compatible with the self-adjointness of the radial Hamiltonian and the invariance under integer translations of the reduced flux.

After confining the theory to a finite region, we check the consistency with the index theorem, and evaluate its vacuum fermionic number and Casimir energy.
A MODEL-INDEPENDENT AND REPHASE-INVARIANT PARAMETRIZATION OF CP VIOLATION
Authors: COCOLICCHIO D. , VIGGIANO M.
Published: April 2003

The phenomenological description of the neutral B meson system is proposed in terms of the fundamental CP-violating observables and within a rephasing invariant formalism. This generic formalism can select the time-dependent and time-integrated asymmetries which provide the basic tools to discriminate the different kinds of possible CP-violating effects in dedicated experimental B meson facilities.
SCHWINGER MASS IN RENORMAL-ORDERED CHIRAL PERTURBATION THEORY
Authors: ADAM C.
Published: April 2003

The massive Schwinger model may be analyzed by a perturbation expansion in the fermion mass. However, the results of this mass perturbation theory are sensible only for sufficiently small fermion mass. By performing a renormal-ordering, we arrive at a chiral perturbation expansion where the expansion parameter remains small even for large fermion mass. We use this renormal-ordered chiral perturbation theory for a computation of the Schwinger mass and compare our results with lattice computations.
SECOND-LOOP CORRECTIONS FROM SUPERHEAVY GAUGE SECTOR TO GAUGE COUPLING UNIFICATION
Authors: GRECH DARIUSZ
Published: April 2003

We deal with extensions of the Standard Model adding horizontal interactions between particle generations. We calculate two-loop corrections caused by the presence of coupling between hypothetical horizontal gauge bosons and matter field at high energy. It is shown that the coupling of such extra bosons does not affect up to two-loop level the positive features of unified and extended Standard Model with horizontal symmetry discussed in former publications. Corrections from bosonic horizontal sector make up about tenth part of those caused by fermionic sector. Although small, they are larger than the accuracy of some electroweak measurements and therefore they might be important for future verification of various proposed horizontal models.
RECOGNITION OF PARTIALLY OCCLUDED OBJECTS USING AN ORTHOGONAL COMPLEX AR MODEL APPROACH
Authors: TO F. W. , TSANG K. M.
Published: April 2003

The application of the orthogonal complex AR model approach has been extended for the recognition of partially occluded objects. The 2-D boundary of an object is extracted and is divided into a number of line segments by locating the turning points. Each line segment is resampled into a fixed number of data points and a complex AR model is used to represent each line segment. An orthogonal estimator is implemented to determine the correct model order and to estimate the corresponding AR model parameters. Each line segment is associated with a minimum feature vector denoting the estimated AR model parameters and similar line segments for different patterns have similar AR model parameters. Recognition of an occluded object based on the matching of line segments of two patterns is derived. An algorithm for finding the turning points has also been devised, which is quite robust to various object sizes and orientation, resolution and noise effect of the object image. Experimental results were obtained to show the effectiveness of the proposed approach for the recognition of objects which are partly covered or partially occluded, and the approach is robust to different object sizes and orientation.
INTERACTIVELY TRAINING PIXEL CLASSIFIERS
Authors: PIATER JUSTUS H. , RISEMAN EDWARD M. , UTGOFF PAUL E.
Published: April 2003

For typical classification tasks, all training data are prepared in advance and are supplied to the classifier all at once. This is unnecessarily expensive and incurs overfitting problems, since the individual contributions of the training instances to the classifier are not known. We address this by proposing an interactive incremental framework for image classifier construction, where small numbers of training examples are supplied at each user interaction. After incorporating new training instances, the classifier immediately reclassifies the image to provide the user with instant feedback. This allows the user to choose additional informative training pixels from among the currently misclassified ones. Using a realistic terrain classification task, we demonstrate the potential of our method to generate small and accurate decision tree classifiers from surprisingly few training examples while avoiding overspecialization. We also briefly discuss the novel concept of hierarchical classification, where higher-level classifiers take as input the output of lower-level classifiers. We present preliminary results indicating that within our interactive framework, this is a practical approach to exploiting spatial relationships for classification.
STRUCTURAL AND FUZZY TECHNIQUES IN THE RECOGNITION OF ONLINE ARABIC CHARACTERS
Authors: BOUSLAMA FAOUZI
Published: April 2003

This paper describes a new hybrid approach for the automatic recognition of handwritten Arabic characters. The algorithm is based on structural techniques and fuzzy logic. Local features such as lines, curves, diacritic points are extracted from the geometry and topology of characters. Fuzzy linguistic variables are used to model the features and provide a suitable mean to vaguely describe the many styles and variations in the writing system. The combination of local features provide a natural way to describe characters in a compact style. Fuzzy if–then rules are used for classification. This hybrid technique is efficient for large and complex sets such as Arabic characters.