bluuebunny/crossref_metadata_2025 huggingface dataset:
Temporal variation of hydroxyl radical generation and 8-hydroxy-2′-deoxyguanosine formation by coarse and fine particulate matter
Authors: Shi T , Knaapen A M , Begerow J , Birmili W , Borm P J A , Schins R P F
Published: April 2003

Aims:To determine the induction of 8-hydroxy-2′-deoxyguanosine (8-OHdG) by fine (<2.5 μm) and coarse (10–2.5 μm) particulate matter (PM) sampled over time at one sampling location, and to relate the observed effects to the hydroxyl radical (•OH) generating activities and transition metal content of these samples, and to meteorological parameters.

Methods:Weekly samples of coarse and fine PM were analysed for H2O2dependent •OH formation using electron spin resonance (ESR) and formation of 8-OHdG in calf thymus DNA using an immuno-dotblot assay. Immunocytochemistry was used to determine 8-OHdG formation in A549 human epithelial lung cells. To determine temporal effects, samples from six weeks in summer and six weeks in autumn/winter were compared using ESR and the dotblot assay. Concentrations of leachable V, Cr, Fe, Ni, and Cu were determined by inductively coupled plasma mass spectrometry.

Results:Both PM fractions elicited •OH generation as well as 8-OHdG formation in calf thymus DNA and in A549 cells. 8-OHdG formation in the naked DNA was significantly related to •OH generation, but not to metal concentrations except for copper. A significantly higher •OH generation was observed for coarse PM, but not fine PM collected during the autumn/winter season; this was not due to differences in sampled mass or metal content. Specific weather conditions under which increased •OH formation in the coarse mode was observed suggest that other, as yet unknown, anthropogenic components might affect the radical generating capacity of PM.

Conclusions:Both coarse and fine PM are able to generate •OH, and induce formation of 8-OHdG. When considered at equal mass, •OH formation shows considerable variability with regard to the fraction of PM, as well as the sampling season. The toxicological implications of this heterogeneity in •OH formation by PM, as can be easily determined by ESR, need further investigation.
BOTTOM-UP APPROACH TO B-PARAMETER IN MINIMAL SUPERSYMMETRIC STANDARD MODEL
Authors: KAWAMURA YOSHIHARU , KOBAYASHI TATSUO , WATANABE MANABU
Published: April 2003

We study μ and B-parameters in the minimal supersymmetric standard model (MSSM) based on the radiative electroweak symmetry breaking scenario using "bottom-up" approach and show how useful our approach is to select a phenomenologically viable model beyond the MSSM under the assumption that the underlying theory is a string model or a gauge-Yukawa unified gauge model.
QUANTUM MODEL OF INTERACTING "STRINGS" ON THE SQUARE LATTICE
Authors: BOOS H. E.
Published: April 2003

The model which is the generalization of the one-dimensional XY-spin chain for the case of the two-dimensional square lattice is considered. The subspace of the "string" states is studied. The solution to the eigenvalue problem is obtained for the single "string" in cases of the "string" with fixed ends and "string" of types (1, 1) and (1, 2) living on the torus. The latter case has the features of a self-interacting system and does not seem to be integrable while the previous two cases are equivalent to the free-fermion model.
RING DIAGRAMS AND ELECTROWEAK PHASE TRANSITION IN A MAGNETIC FIELD
Authors: SKALOZUB VLADIMIR , BORDAG MICHAEL
Published: April 2003

Electroweak phase transition in a magnetic field is investigated within the one-loop and ring diagram contributions to the effective potential in the minimal Standard Model. All fundamental fermions and bosons are included with their actual values of masses and the Higgs boson mass is considered in the range 75 GeV ≤ mH ≤ 115 GeV . The effective potential is real at sufficiently high temperature. The important role of fermions and W-bosons in symmetry behavior is observed. It is found that the phase transition for the field strengths 1023-1024 G is of first order but the baryogenesis condition is not satisfied. The comparison with the hypermagnetic field case is done.
ELECTROMAGNETIC INTERACTION OF MASSIVE SPIN-3 STATE FROM STRING THEORY
Authors: KLISHEVICH S. M.
Published: April 2003

In our present work we study an interaction of second mass level of an open bosonic string with constant electromagnetic field. This state contains massive fields with spins 3 and 1. Using a method based on the BRST quantization of an open string, we obtain gauge-invariant Lagrangian, describing the electromagnetic interaction of these fields. From the explicit form of transformations and Lagrangian it follows that the presence of the external constant e.m. field induces the mixing of the states at the given level. Most likely, the presence of the external field will lead to the mixing of the states on other mass string levels as well.
ON THE CONFORMAL ANOMALY FROM HIGHER DERIVATIVE GRAVITY IN AdS/CFT CORRESPONDENCE
Authors: NOJIRI SHIN'ICHI , ODINTSOV SERGEI D.
Published: April 2003

We follow Witten's proposal1 in the calculation of conformal anomaly from (d + 1)-dimensional higher derivative gravity via AdS/CFT correspondence. It is assumed that some d-dimensional conformal field theories have a description in terms of above (d + 1)-dimensional higher derivative gravity which includes not only the Einstein term and cosmological constant but also curvature squared terms. The explicit expression for two-dimensional and four-dimensional anomalies is found, it contains higher derivative corrections. In particular, it is shown that not only Einstein gravity but also theory with the Lagrangian L =aR2 + bRμνRμν + Λ (even when a=0 or b=0) is five-dimensional bulk theory for [Formula: see text] super-Yang–Mills theory in AdS/CFT correspondence. Similarly, the d + 1 = 3 theory with (or without) Einstein term may describe d = 2 scalar or spinor CFT's. That gives new versions of bulk side which may be useful in different aspects. As application of our general formalism we find next-to-leading corrections to the conformal anomaly of [Formula: see text] supersymmetric theory from d = 5 AdS higher derivative gravity (low energy string effective action).
RADIATIVE DECAYS OF HEAVY MESON IN THE LIGHT CONE QCD SUM RULE
Authors: ROUTH H.
Published: April 2003

The long-distance contribution of heavy B and D mesons are calculated in the light cone QCD sum rule. Here I have discussed both the parity conserving and parity violating form factors in the radiative decays of B and D mesons e.g. B*, B**, [Formula: see text], D*, D** and [Formula: see text] mesons. I have studied the decay of type P → Vγ and estimated the light cone QCD sum rule form factors and the branching ratio for various decay modes of B and D mesons. Although the short-distance electromagnetic Penguin contribution is the dominant contribution in the P → Vγ decay, it is also necessary to take into account the long distance contribution for completeness of study of the decays discussed in the text.
SEMILEPTONIC WEAK DECAYS OF HEAVY BARYONS
Authors: HAGHIGHAT MANSOUR
Published: April 2003

We propose a simple model to describe the semileptonic weak decays among heavy baryons in the heavy quark limit in a unified way. The current matrix elements of the heavy baryons, with spin-0 light diquark, are evaluated to give the ω-dependence of the form factors. The numerical values are also calculated and the branching ratio for [Formula: see text] is consequently obtained in the range (4.9–15.3)%.
MOTION AROUND A GLOBAL MONOPOLE
Authors: BANERJEE A. , GHOSH T.
Published: April 2003

The motion of test particles and light rays in the perturbed gravitational field around a global monopole is studied. The metric of the monopole was previously obtained by solving the linearized semiclassical Einstein equations (Hiscock). The bending of light ray passing by such a monopole has contributions from the conical object as well as from the perturbed terms. The possibility of trapping particles in the perturbed gravitational field is also discussed.
CONFORMAL INVARIANCE AND QUANTUM ASPECTS OF MATTER
Authors: MOTAVALI H. , SALEHI H. , GOLSHANI M.
Published: April 2003

The vacuum sector of the Brans–Dicke theory is studied from the viewpoint of a nonconformally invariant gravitational model. We show that, this theory can be conformally symmetrized using an appropriate conformal transformation. The resulting theory allows a particle interpretation, and suggests that the quantum aspects of matter may be geometrized.
THERMODYNAMICS OF SCHWARZSCHILD–(ANTI-)DE SITTER BLACK HOLES WITH ACCOUNT OF QUANTUM CORRECTIONS
Authors: NOJIRI SHIN'ICHI , ODINTSOV SERGEI D.
Published: April 2003

We discuss the quantum corrections to thermodynamics (and geometry) of S(A)dS BH's using large N one-loop anomaly induced effective action for dilaton coupled matter (scalars and spinors). It is found that the temperature, mass and entropy with account of quantum effects for multiply horizon SdS BH and SAdS BH which also gives the corresponding expressions for their limits: Schwarzschild and de Sitter spaces. In the last case one can talk about quantum correction to the entropy of an expanding universe.

The anomaly induced action under discussion corresponds to 4d formulation (s-wave approximation, 4d quantum matter is a minimal one) as well as 2d formulation (complete effective action, 2d quantum matter is a dilaton coupled one). Hence, most of the results are given for the same gravitational background with interpretation as 4d quantum corrected BH or 2d quantum corrected dilatonic BH. Quantum aspects of thermodynamics of 4d 't Hooft BH model are also considered.
ON ELEVATING FREE-FERMION Z2×Z2 ORBIFOLDS MODELS TO COMPACTIFICATIONS OF F THEORY
Authors: BERGLUND P. , ELLIS J. , FARAGGI A. E. , NANOPOULOS D. V. , QIU Z.
Published: April 2003

We study the elliptic fibrations of some Calabi–Yau threefolds, including the Z2×Z2 orbifold with (h1,1,h2,1)=(27, 3), which is equivalent to the common framework of realistic free-fermion models, as well as related orbifold models with (h1,1,h2,1)=(51, 3) and (31, 7). However, two related puzzles arise when one considers the (h1,1,h2,1)=(27, 3) model as an F theory compactification to six dimensions. The condition for the vanishing of the gravitational anomaly is not satisfied, suggesting that the F theory compactification does not make sense, and the elliptic fibration is well defined everywhere except at four singular points in the base. We speculate on the possible existence of N=1 tensor and hypermultiplets at these points which would cancel the gravitational anomaly in this case.
NONMINIMAL SCALAR–TENSOR THEORIES AND QUANTUM GRAVITY
Authors: SHOJAI FATIMAH , SHOJAI ALI
Published: April 2003

Recently1it has been shown that the quantum effects of matter determine the conformal degree of freedom of the space–time metric. This was done in the framework of a scalar–tensor theory with one scalar field.2,3A point with that theory is that the form of quantum potential is preassumed. Here we present a scalar–tensor theory with two scalar fields, and no assumption on the form of quantum potential. It is shown that using the equations of motion one gets the correct form of quantum potential plus some corrections.
STRANGE STAR IN THE PRESENCE OF A STRONG MAGNETIC FIELD
Authors: SAHU P. K. , PATRA S. K.
Published: April 2003

We study the effect of a strong magnetic field on interacting quark matter and apply the same to strange star. We find that interacting strange matter is less stable than noninteracting strange matter in the presence of a strong magnetic field. We then calculate strange star structure parameters such as mass and radius and find that the strange star is less compact for interacting quark matter than for free quark matter in presence of strong magnetic field. The maximum masses of strange stars are found to be within the recent observational limit.
TWISTED YANGIANS AND FOLDED ${\mathcal W}$ -ALGEBRAS
Authors: RAGOUCY E.
Published: April 2003

We show that the truncation of twisted Yangians are isomorphic to finite [Formula: see text] -algebras based on orthogonal or symplectic algebras. This isomorphism allows us to classify all the finite-dimensional irreducible representations of the quoted [Formula: see text] -algebras. We also give an R matrix for these [Formula: see text] -algebras, and determine their center.
QUARKONIA PRODUCTION AND POLARIZATION STUDIES WITH CDF
Authors: PAPADIMITRIOU VAIA
Published: April 2003

In this paper we present results on production and polarization of the J/ψ, ψ(2S), χc, ϒ and χb states at [Formula: see text]. These results were obtained from data taken with the CDF detector at Fermilab. We cover recently completed analyses of the 1992-96 collider run.
Three-jet Event Properties at CDF
Authors:   For the CDF Collaboration, GORELOV I. , BRANDL A. , SEIDEL S.
Published: April 2003

The properties of three-jet events in data of integrated luminosity 86±4 pb -1 from CDF Run 1b with a trigger on total ∑ E T > 175 GeV have been analyzed and compared to predictions from a next-to-leading order perturbative QCD calculation. Special emphasis has been placed on analysis of the Dalitz variables.
MEASUREMENT OF dσ/dy FOR HIGH MASS DRELL-YAN e+e-PAIRS AT CDF
Authors:   for the CDF Collaboration (Presented at DPF 2000), BODEK ARIE
Published: April 2003

We report on the first measurement of the rapidity distribution dσ/dy over nearly the entire kinematic region of rapidity for e+e-pairs in the Z-boson region of 66 < Mee< 116 GeV /c2and at higher mass Mee> 116 GeV /c2. The data sample consists of 108 pb-1of [Formula: see text] collisions at [Formula: see text] taken by the Collider Detector at Fermilab during 1992–1995. The total cross section in the Z-boson region is measured to be 252 ± 11 pb. The measured total cross section and dσ/dy are compared with quantum chromodynamics calculations in leading and higher orders. (CDF Note 5422)
DIJET PRODUCTION BY DOUBLE POMERON EXCHANGE AT THE TEVATRON
Authors:   (Representing the CDF Collaboration), TERASHI KOJI
Published: April 2003

We report the observation of dijet events with a Double Pomeron Exchange topology produced in [Formula: see text] collisions at [Formula: see text]. The events are characterized by a leading antiproton, two jets in the central pseudorapidity region, and a rapidity gap on the outgoing proton side. Results on kinematics, production rates, and comparisons with corresponding results from single diffractive and inclusive dijet production are presented.
MEASUREMENT OF THE W BOSON MASS AND WIDTH IN DELPHI AT LEP
Authors:   On behalf of the DELPHI Collaboration, MULDERS MARTIJN
Published: April 2003

A measurement of the W boson mass and width has been performed by the DELPHI collaboration. During the years 1997-1999 DELPHI collected data with an interrated luminosity of 435 pb-1 at center-of-mass energies ranging from 183 to 202 GeV. LEP is currently running at energies up to 208 GeV. The DELPHI analysis and preliminary numbers presented at ICHEP 2000, Osaka, are discussed and an overview is given of improvements in statistical sensitivity and determination of systematic errors to be expected for the final analysis of the total LEP2 data sample.
SLD's Final Leptonic Asymmetry Parameter Measurements
Authors:   Representing the SLD Collaboration, Panvini Robert S.
Published: April 2003

We report the SLD experiment's final measurements of leptonic asymmetry parameters from which [Formula: see text] at the Z0 pole is accurately determined. Based on these measurements, the Higgs boson mass is estimated to be less than 147 GeV/c 2 at 95% confidence level within the context of the standard model.
A Precision Measurement of Muon Decay
Authors:   TWIST Collaboration, Quraan M. A. , Gaponenko A. , Green P. , Kitching P. , MacDonald R. , Price G. , Rodning N. L. , Schaapman J. , Sobratee F. , Soukup J. , Stinson G. , Khruchinsky A. , Selivanov V. , Torokhov V. , Gagliardi C. A. , Hardy J. C. , Musser J. R. , Tribble R. E. , Vasiliev M. A. , Andersson W. , Comyn M. , Davydov Yu. , Doornbos J. , Faszer W. , Gill D. R. , Gumplinger P. , Henderson R. , Macdonald J. A. , Marshall G. M. , Olin A. , Ottewell D. , Openshaw R. , Poutissou J-M. , Poutissou R. , Sheffer G. , Walter H. K. , Wright D. , Hasinoff M. , Mass D. , Depommier P. , Korkmaz E. , Porcelli T. A. , Mathie T. , Tacik R. , Shin Y. , Koetke D. D. , Manweiler R. , Nord P. , Stanislaus T. D. S.
Published: April 2003

The (V-A) structure of the weak interaction was put into the standard model by hand in order to obtain agreement with experiments. These experiments, however, do not rule out relatively large deviations from this structure. Muon decay provides an ideal laboratory to test this structure, being a purely leptonic process. The TRIUMF Weak Interaction Symmetry Test (TWIST) will measure both the energy and emission-angle distribution of positrons from the decay of polarized muons. This will provide a simultaneous determination of the Michel parameters Pμξ, ρ and δ describing muon decay with a precision of a few parts in 104. Stringent limits may then be placed on the coupling constants, as well as the mass and mixing angle of a possible right-handed W boson (WR). In this paper the formalism for muon decay is presented, TWIST is described, and the expected results are discussed.
MEASUREMENT OF THE ANGULAR DISTRIBUTION OF ELECTRONS FROM W→eν DECAYS OBSERVED IN $p\bar p$ COLLISIONS AT $\sqrt{s} =1.8\, {\rm TeV}$
Authors:   for the DØ Collaboration, STEINBRÜCK GEORG
Published: April 2003

We present the first measurement of the electron angular distribution parameter α2 in W → e ν events in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the DØ detector during the 1994–1995 Fermilab Tevatron run. We compare our results with next-to-leading order perturbative QCD, which predicts an angular distribution of (1 ± α1 cos θ* + α2 cos 2 θ*), where θ* is the polar angle of the electron in the Collins-Soper frame and α1 and α2 are functions of [Formula: see text], the W boson transverse momentum. This measurement provides a test of next-to-leading order QCD corrections which are a non-negligible contrbution to the W boson mass measurement.
Search for Single Top Production with CDF
Authors:   (For the CDF Collaboration), Kikuchi T. , Wolinski S. K. , Demortier L. , Kim S. , Savard P.
Published: April 2003

We search for Standrod Model single-top-quark production in the W -gluon fusion and W* channels using 106 pb-1 of data from [Formula: see text] collisions at [Formula: see text] collected with the Collider Detector at Fermilab. We set an upper limit at 95% C.L. on the combined Wg + W* single-top cross section of 13.5 pb, roughly five-and-a-half times larger larer than the standard model prediction. Separate 95% C.L. upper limits in the Wg-fusion and W* channels ae also determined and are found to be 13.5 and 12.9 pb respectively.
SEARCH FOR ELECTROWEAK PRODUCTION OF SINGLE TOP QUARKS AT DØ
Authors:   For the DØ Collaboration, HEINSON A. P.
Published: April 2003

This paper discusses a search for electroweak production of single top quarks in the electron+jets and muon+jets decay channels. The measurements use ≈ 90 pb -1 of data from Run 1 of the Fermilab Tevatron collider, collected at 1.8 TeV with DØ detector. We use events that include a tagging muon, implying the presence of a b jet, to set an upper limit at the 95% confidence level on the cross section for the s-channel process [Formula: see text] of 39 pb. The upper limit for the t-channel process [Formula: see text] is 58 pb.
NEURAL NETWORK TECHNIQUES FOR A RUN II SEARCH 0F SINGLE TOP PRODUCTION AT CDF
Authors:   On behalf of the CDF Collaboration, CIOBANU CATALIN I.
Published: April 2003

At the Tevatron Collider it is possible to create single top quarks in the final state via either off mass shell W production (W*), or the W-gluon fusion process. The Standard Model predicts a production cross section of only a few picobarns. In addition, the backgrounds for single top production at large. The datasets collected during Run I at the Tevatron were not sufficiently large to extract the signal from the large W+jets background. In Run II at the Tevatron, we expect to collect 2 fb -1 of data, a twenty fold increase. We present here a method of searching for single top production using the Artificial Neural Network technique. We will describe the technique and present results based on Monte Carlo studies. We will demonstrate that the Neural Net approach is well suited for extracting the signal from a sample with a poor signal-to-background ratio.
Top Prospects for Run II at CDF
Authors:   (for the CDF Collaboration), Koehn Phillip
Published: April 2003

Selected CDF top quark physics results in Run I and expectations for the upcoming Tevatron run beginning 2001 (Run II) are summarized. Running at [Formula: see text] and higher luminosity, the number of top quarks produced will be greatly increased in Run II. The upgraded CDF detector will significantly increase the acceptance for top events. These factors will substantially increase top yield that will not only improve the precision of current top production and decay measurements, but will provide exciting opportunities for new top physics studies.
SEARCH FOR CHARGED HIGGS BOSONS IN DECAYS OF PAIR-PRODUCED TOP QUARKS AT DØ
Authors:   For The DØ Collaboration, GUTIERREZ PHILLIP
Published: April 2003

We present a search for t → bH+ in [Formula: see text] candidate events at DØ based on two methods. The first seeks a deficit in signal relative to expectations from the standard model (SM). Such a deficit would imply the presence of a non-SM decay of the top quark. This search involves the full data sample of ≈ 110 pb -1 of [Formula: see text] collisions at [Formula: see text], collected with the DØ detector. The second method looks for charged Higgs decays to τ leptons (and associated neutrinos), and is based on a 62 pb -1 subset of the aforementioned data sample.
MEASUREMENT OF THE B0 AND B- MESON LIFETIMES IN ALEPH
Authors:   (for the ALEPH Collaboration), HÜTTMANN KAY
Published: April 2003

The lifetimes of the [Formula: see text] and B- meson lifetimes are measured using data recorded on the Z peak with the ALEPH detector at LEP. An improved analysis based on partially reconstructed [Formula: see text] and [Formula: see text] decays is presented.
B LIFETIME MEASUREMENTS WITH EXCLUSIVELY RECONSTRUCTED B DECAYS
Authors:   for the BABAR Collaboration, CHENG CHIH-HSIANG
Published: April 2003

Data collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC are used to measure the lifetimes of the B0 and B+ mesons. The data sample consists of 8.3 fb -1 collected near the ϒ(4S) resonance. B0 and B+ mesons are fully reconstructed in several exclusive hadronic decay modes to charm and charmonium final states. The B lifetimes are determined from the flight length difference between the two B mesons. The preliminary measurements of the lifetimes are [Formula: see text] and their ratio is [Formula: see text]
PROSPECTS FOR RUN II BEAUTY PHYSICS AT DØ
Authors:   For the DØ Collaboration, TAYLOR WENDY
Published: April 2003

In the spring of 2001, the upgraded Fermilab Tevatron will begin its collider physics run with [Formula: see text] collisions at [Formula: see text], where it is expected to deliver an integrated luminosity of 2 fb -1 in the first two years. The DØ detector is undergoing an extensive upgrade in order to take full advantage of the high luminosity running conditions. The upgraded detector's new silicon vertex detector, fiber tracker, and lepton trigger capabilities make a rich B physics program possible at DØ. This paper describes the prospects for several DØ B physics measurements, including CP violation in [Formula: see text] decays, Bs mixing and [Formula: see text] lifetime.
A MEASUREMENT OF THE BRANCHING FRACTION OF THE EXCLUSIVELY DECAY B0→ K*0γ
Authors:   for the BABAR Collaboration, TANAKA H. A.
Published: April 2003

The exclusive decay B0→ K*0γ proceeds via the b → sγ electroweak penguin diagram. This process can be used to probe the electroweak couplings of the top quark as well as any new physics that could also mediate the process. Using (8.6± 0.3) × 106 decays, we obtain a preliminary branching fraction measurement of the decay B0 → K*0γ of ℬ(B0 → K*0γ)= (5.42 ± 0.82 ± 0.47) × 10-5.
SEARCH FOR THE DECAY Bs→μ+μ -ϕ IN $p\bar p$ COLLISIONS AT $\sqrt{s} =1.8\, {\rm TeV}$
Authors:   (For the CDF Collaboration), SPEER THOMAS
Published: April 2003

We present a search for the flavor-changing neutral current decay Bs→ μ+μ-ϕ in [Formula: see text] collisions at [Formula: see text], using 91.4 pb-1 of data collected at the Collider Detector at Fermilab (CDF). We find two candicate events for this decay, which is consistent with the background estimate, and set a preliminary upper limit on the branching fraction of ℬ(Bs → μ+ μ-ϕ)<4.2 · 10-5 at a 90% confidence level.
INCLUSIVE CHARGED KAON PRODUCTION FROM B MESONS IN ϒ(4S) DECAYS
Authors:   (for the CLEO Collaboration), RICHICHI STEPHEN
Published: April 2003

We have investigated the inclusive production of charged kaons from B mesons in ϒ (4S) decays. We present our results (up to 800 MeV/c) of the measurement of the charged kaon momentum spectrum, using information from the specific ionization (dE/dx) particle identification (PID) device. We fit PID histograms with known samples of primary (pion, kaon, proton) and secondary (electron, muon) control shape histograms, using a χ2 minimization technique. We compare our findings with ARGUS and with MC and comment on the implications for b → s g from the analsis.
RECENT CLEO RESULTS ON CHARMED BARYONS
Authors:   CLEO Collaboration., SEVERINI HORST
Published: April 2003

Using data recorded by the CLEO II and CLEO II.V detectors at CESR, we report new measurements of the [Formula: see text] and [Formula: see text] masses, and the first measurements of their intrinsic widths. The measured widths of these particles agree with the theoretical predictions. We also present a new measurement of the mass of the [Formula: see text] charmed baryon, observed by its decay into [Formula: see text], and the first observation of a new state which is identified as the [Formula: see text], the isospin partner of the previously discovered [Formula: see text] and [Formula: see text].

The quark model predicts many excited states of Λc and Σc baryons, some of which cannot, because of quantum mechanical conservations rules, decay via one pion to the ground state. We present results of a search for such states decaying via dipion decays into the ground state [Formula: see text]

Recently, The CLEO collaboration also reported the existence of a pair of excited Ξc particles decaying into [Formula: see text]. These are thought to be orbitally excited Ξc' s with JP = 3/2-. Here we present a search for the analogous JP=1/2- particles, which are predicted to decay into [Formula: see text].
From factor ratio measurement in the decay Λc→Λ e+ ν
Authors: PAVLUNIN VICTOR , SHIPSEY IAN
Published: April 2003

The hadronic current of the matrix element for the transition Λc→Λ e+ ν within the framework of HQET is parameterized in terms of two form factors. By studying the decay rate distribution in the space of the decay kinematic variables one can extract the ratio [Formula: see text] of the form factors. The first measurement1 of R was made by the CLEO collaboration in 1995. In this note we describe the study of the statistical and systematic errors for a 4.5 times larger data sample. The central value for R will be presented shortly.
STUDY OF ISOSCALAR MESONS USING D-MESON DECAYS FROM FERMILAB E791
Authors:   Representing the Fermilab E791 Collaboration and supported by DE-FG02-92ER40702., NAPIER AUSTIN
Published: April 2003

Fermilab E791 obtained a very large sample of charm meson decays (~ 250K), including a clean sample of 1172±61 D± and [Formula: see text] decays into three charged pions. A coherent amplitude analysis was used to fit the Dalitz plot distributions of these D± and [Formula: see text] decays and to measure the contributions from ρ0(770)π+, f0(980)π+, f2(1270)π+, f0(1370)π+, ρ0(1450)π+, and non-resonant π-π+π+ final states. The [Formula: see text] analysis provided accurate measurements of the masses and widths of the f0(980) and f0(1370). We also find strong evidence for a broad low-mass scalar resonance (mass 478 Mev/c2 and width 324 Mev/c2) which accounts for nearly half of the D± decays.
CP violation measurements at ALEPH
Authors:   For the ALEPH Collaboration., AAGAARD PETERSEN BRIAN
Published: April 2003

We use the full ALEPH data set at LEP1 of four million hadronic Z decays to measure CP asymmetries in the [Formula: see text] decay. From 23 [Formula: see text] decays the value [Formula: see text] is measured, while from two measurements of the semileptonic asymmetry a CP using inclusive b decays we obtain a CP =-0.013±0.026.
MEASUREMENT OF sin(2ϕ1) AT BELLE
Authors:   Representing the Belle Collaboration, RODRIGUEZ JORGE L.
Published: April 2003

With 6.2 fb-1 of data collected on the ϒ(4S), Belle reports its first measurement of [Formula: see text]. The result was obtained by fitting the proper time distribution of flavor tagged and fully reconstructed neutral B mesons decays to five different charmonia plus a Ks or KL channels. In this paper the analysis and results will be described briefly.
LIKE-SIGN DILEPTON SEARCH FOR CHARGINO-NEUTRALINO PRODUCTION AT CDF
Authors:   For the CDF Collaboration., WORCESTER MATTHEW , NACHTMAN JANE , SALTZBERG DAVID
Published: April 2003

We present new results from the like-sign dilepton search for chargino-neutralino [Formula: see text] production in [Formula: see text] collisions at [Formula: see text], which complements the previously published trilepton search with the CDF detector using Fermilab Run IB data. Monte Carlo calculations of signal efficiency and backgrounds, as well as estimates of certain back grounds taken from Run IB data, indicate a significant increase in sensitivity to [Formula: see text] production compared to the traditional trilepton analysis alone.
SEARCH FOR STANDARD MODEL HIGGS BOSON AT LEP WITH THE DELPHI DETECTOR
Authors:   ON BEHALF OF THE DELPHI COLLABORATION., FERNANDEZ JAVIER
Published: April 2003

Search for the Higgs boson of the Standard Model have been performed using the data collected by the DELPHI experiment at LEP in 2000 corresponding to centre-of-mass energies up to 209 GeV. These results are used, in combination with our results from previous years, to obtain preliminary confidence levels on the existence of an Standard Model Higgs boson with a mass in the range [105-115] GeV /c2.
Searches for MSSM Higgs Bosons with the DELPHI Detector up to $\sqrt{s} = 209~{\rm GeV}$
Authors:   Talk given on behalf of the DELPHI Collaboration., STANITZKI MARCEL
Published: April 2003

Searches for hA pair production and hZ production have been performed. Special emphasis has been put on searches, in which the Higgs can decay invisibly into neutralinos. The data collected by the DELPHI experiment at centre-of-mass energies between 191.6 and 201.7 Gev for the year 1999 and between 201.7 and 209.0 Gev for the ongoing data taking in 2000 has been used. These analyses are used, in combination with our results at lower energies, to set 95% confidence levels on the existence of a light neutral Higgs Boson h and a neutral pseudoscalar Higgs Boson A in a mass range of 85-115 GeV/c 2. Combining the searches for visible and invisible Higgs decays allows to obtain 95% confidence levels on the existance of h independent of the branching ratio into invisible decays, if the visible decays are taken to be the SM ones. The MSSM parameter space excluded by these searches has been determined.
SEARCH FOR A HIGGS BOSON DECAYING INTO TWO PHOTONS WITH THE L3 DETECTOR AT LEP
Authors:   On behalf of the L3 Collaboration., ROSCA AURA
Published: April 2003

A search is performed for a Higgs boson, decaying into two photons, using the L3 data collected at centre of mass energies between [Formula: see text] and 202 GeV, corresponding to an integrated luminosity of 400 pb -1. The processes [Formula: see text], [Formula: see text], e+e-→ Zh → ℓ+ℓ-γγ are considered. The observed data are found to be consistent with the expected background from standard physics processes. Limits on the branching fraction of the Higgs boson decay into two photons as a function of the Higgs mass are shown and a lower mass limit on a fermiophobic Higgs is derived.
Neutralino Proton Cross Sections in SUGRA and D-BRANE Models
Authors: Arnowitt R. , Dutta B. , Santoso Y.
Published: April 2003

We calculate the spin independent neutralino-proton cross section for universal SUGRA, non universal SUGRA and D-brane models with R-parity invariance. The regions of maximum cross section in these models has started to be probed by the current detectors. The minimum cross section generally is [Formula: see text] and hence will be accessible in the future detectors, barring special regions of parameter space where it can reduce to ≃10-12pb. However, the squarks and gluinos will be heavy [Formula: see text] in the latter case, but still accessible at the LHC.
ON THE CRITICAL BEHAVIOR OF HERMITIAN f-MATRIX MODELS IN THE DOUBLE SCALING LIMIT WITH f ≥ 3
Authors: BALASKA S. , MAEDER J. , RÜHL W.
Published: April 2003

An algorithm for the isolation of any singularity of f-matrix models in the double scaling limit is presented. In particular it is proved by construction that only those universality classes exist that are known from two-matrix models.
NUMERICAL STUDY OF CHARGE AND STATISTICS OF LAUGHLIN QUASIPARTICLES
Authors: KJØNSBERG HEIDI , MYRHEIM JAN
Published: April 2003

We present numerical calculations of the charge and statistics, as extracted from Berry phases, of the Laughlin quasiparticles, near filling fraction 1/3, and for system sizes of up to 200 electrons. For the quasiholes our results confirm that the charge and statistics parameter are e/3 and 1/3, respectively. For the quasielectron charge we find a slow convergence towards the expected value of -e/3, with a finite size correction for N electrons of approximately -0.13e/N. The statistics parameter for the quasielectrons has no well defined value even for 200 electrons, but might possibly converge to 1/3. The anyon model works well for the quasiholes, but requires singular two-anyon wave functions for modelling two Laughlin quasielectrons.
BEYOND THE WEISSKOPF–WIGNER APPROXIMATION IN THE $K^0-\bar K^0$ SYSTEM
Authors: NOWAKOWSKI MAREK
Published: April 2003

We reanalyze the time evolution of the [Formula: see text] system in the language of certain spectral function whose Fourier transforms give the time-dependent survival and transition amplitudes. Approximating the spectral function by a one-pole ansatz we obtain insight into the limitation of the validity of the one-pole approximation. It will be shown that the same validity restrictions apply to the known formulae of the Weisskopf–Wigner approximation as well. The present analysis can also be applied to the effect of so-called vacuum regeneration of KL and KS. As a result of this possibility new contributions to the well-known oscillatory terms will enter the time-dependent transition probabilities. It will be shown that the order of magnitude of this new effect is very small and, in principle, its exact determination lies outside the scope of the one-pole ansatz.
KNIZHNIK–ZAMOLODCHIKOV–BERNARD EQUATIONS CONNECTED WITH THE EIGHT-VERTEX MODEL
Authors: BABUJIAN H. , POGHOSSIAN R. H. , LIMA-SANTOS A.
Published: April 2003

By the use of the quasiclassical limit of Baxter's eight-vertex R matrix, an elliptic generalization of the Knizhnik–Zamolodchikov equation is constructed. An integral representation for the solution of this equation is obtained via the off-shell Bethe ansatz. It is shown that there exists a gauge transformation connecting this equation with the Knizhnik–Zamolodchikov–Bernard equation for the SU(2) WZNW model on a torus.
PATH INTEGRAL QUANTIZATION OF THE SYMPLECTIC LEAVES OF THE SU(2)* POISSON–LIE GROUP
Authors: MORARIU BOGDAN
Published: April 2003

The Feynman path integral is used to quantize the symplectic leaves of the Poisson–Lie group SU(2)*. In this way we obtain the unitary representations of [Formula: see text]. This is achieved by finding explicit Darboux coordinates and then using a phase space path integral. I discuss the *-structure of SU(2)* and give a detailed description of its leaves using various parametrizations. I also compare the results with the path integral quantization of spin.
PERTURBATION THEORY FOR SINGULAR POTENTIALS IN QUANTUM MECHANICS
Authors: SEN DIPTIMAN
Published: April 2003

We study perturbation theory in certain quantum mechanics problems in one dimension in which the perturbing potential diverges at some points, even though the energy eigenvalues are smooth functions of the coefficient of the potential. We discuss some of the unusual techniques which are required to obtain perturbative expansions of the energies in such cases. These include a point-splitting prescription with a δ′′ function for expanding around the Dirichlet (fermionic) limit of the δ function potential, and performing a similarity transformation to a non-Hermitian potential in the Calogero–Sutherland model. As an application of the first technique, we study the ground state of the δ function Bose gas near the fermionic limit.
ABOUT BLACK HOLES WITH NONTRAPPING INTERIOR
Authors: CABO ALEJANDRO , AYÓN ELOY
Published: April 2003

Physical arguments related with the existence of black hole solutions having a non-trapping interior are discussed. Massive scalar fields interacting with gravity are considered. Interior asymptotic solutions showing a scalar field approaching a constant value at the horizon are given. It is argued that the coupled Einstein–Klein–Gordon equations can be satisfied in the sense of the generalized functions after removing a particular regularization designed for matching the interior solution with an external Schwarzschild space–time. The scalar field appears as just avoiding the appearance of closed trapped surfaces while coming from the exterior region. It also follows that the usual space integral over [Formula: see text] in the internal region just gives the total proper mass associated to the external Schwarzschild solution, as it should be expected.
CASE STUDY OF THE CONVERGENCY OF NONLINEAR PERTURBATION SERIES: MORSE–FESHBACH NONLINEAR SERIES
Authors: RATH BISWANATH
Published: April 2003

We study the divergent behavior of the Morse–Feshbach nonlinear perturbation series (MFNS) [P. M. Morse and H. Feshbach, Methods of Theoretical Physics, Part II (McGraw-Hill, New York, 1953)] for producing convergent energy levels using the ground state of a quartic anharmonic oscillator (AHO) in the strong coupling limit. Numerical calculations have been done up to tenth order. Further comparison of the MFNS convergent result has been made with the matrix diagonalization method.
MODULI SPACE OF GLOBAL SYMMETRY IN N=1 SUPERSYMMETRIC THEORIES AND THE QUASI-NAMBU–GOLDSTONE BOSONS
Authors: NITTA MUNETO
Published: April 2003

We derive the moduli space of the global symmetry in N=1 supersymmetric theories. We show that, at the generic points, it coincides with the space of quasi-Nambu–Goldstone (QNG) bosons, which appear besides the ordinary Nambu–Goldstone (NG) bosons when the global symmetry G breaks down spontaneously to its subgroup H with preservation of N=1 supersymmetry. At the singular points, most of the NG bosons change to QNG bosons and the unbroken global symmetry is enhanced. The G orbits parametrized by the NG bosons are the fiber at the moduli space and the singular points correspond to the point where the H orbit (in the G orbit) shrinks. We also show that the low energy effective Lagrangian is the arbitrary function of the moduli parameters.
QUANTUM INTEGRABILITY OF COUPLED N=1 SUPER SINE/SINH–GORDON THEORIES AND THE LIE SUPERALGEBRA D(2,1;α)
Authors: EVANS JONATHAN M. , MADSEN JENS OLE
Published: April 2003

We discuss certain integrable quantum field theories in 1+1 dimensions consisting of coupled sine/sinh–Gordon theories with N=1 supersymmetry, positive kinetic energy, and bosonic potentials which are bounded from below. We show that theories of this type can be constructed as Toda models based on the exceptional affine Lie superalgebra D(2,1;α)(1) (or on related algebras which can be obtained as various limits) provided one adopts appropriate reality conditions for the fields. In particular, there is a continuous family of such models in which the couplings and mass ratios all depend on the parameter α. The structure of these models is analyzed in some detail at the classical level, including the construction of conserved currents with spins up to 4. We then show that these currents generalize to the quantum theory, thus demonstrating quantum-integrability of the models.
LOGARITHMIC CONFORMAL FIELD THEORIES AND AdS CORRESPONDENCE
Authors: GHEZELBASH A. M. , KHORRAMI M. , AGHAMOHAMMADI A.
Published: April 2003

We generalize the Maldacena correspondence to the logarithmic conformal field theories. We study the correspondence between field theories in (d+1)-dimensional AdS space and the d-dimensional logarithmic conformal field theories in the boundary of AdS d+1. Using this correspondence, we get the n-point functions of the corresponding logarithmic conformal field theory in d-dimensions.
NONPERTURBATIVE GREEN'S FUNCTIONS IN THEORIES WITH EXTENDED SUPERCONFORMAL SYMMETRY
Authors: HOWE PAUL , WEST PETER
Published: April 2003

The multiplets that occur in four-dimensional rigidly supersymmetric theories can be described either by chiral superfields in Minkowski superspace or analytic superfields in harmonic superspace. The superconformal Ward identities for Green's functions of gauge-invariant operators of these types are derived. It is shown that there are no chiral superconformal invariants. It is further shown that Green's functions of analytic operators in harmonic superspace are severely restricted by the superconformal Ward identities when internal analyticity is taken into account.
SUSY QUANTUM MECHANICS WITH COMPLEX SUPERPOTENTIALS AND REAL ENERGY SPECTRA
Authors: ANDRIANOV A. A. , IOFFE M. V. , CANNATA F. , DEDONDER J.-P.
Published: April 2003

We extend the standard intertwining relations used in supersymmetrical (SUSY) quantum mechanics which involve real superpotentials to complex superpotentials. This allows us to deal with a large class of non-Hermitian Hamiltonians and to study in general the isospectrality between complex potentials. In very specific cases we can construct in a natural way "quasicomplex" potentials which we define as complex potentials having a global property so as to lead to a Hamiltonian with real spectrum. We also obtained a class of complex transparent potentials whose Hamiltonian can be intertwined to a free Hamiltonian. We provide a variety of examples both for the radial problem (half axis) and for the standard one-dimensional problem (the whole axis), including remarks concerning scattering problems.
PROBING FOAMY SPACE–TIME WITH VARIATIONAL METHODS
Authors: GARATTINI REMO
Published: April 2003

A one-loop correction of the quasilocal energy in the Schwarzschild background, with flat space as a reference metric, is performed by means of a variational procedure in the Hamiltonian framework. We examine the graviton sector in momentum space, in the lowest possible state. An application to the black hole pair creation via the Casimir energy is presented. Implications on the foamlike scenario are discussed.
SOLUTION OF THE YANG–BAXTER SYSTEM FOR QUANTUM DOUBLES
Authors: HLAVATÝ LADISLAV , ŠNOBL LIBOR
Published: April 2003

The Yang–Baxter system related to quantum doubles is introduced and a large class of both continuous and discrete symmetries of the solution manifold are determined. A strategy for solution of the system based on the symmetries is suggested and accomplished in dimension 2. A complete list of invertible solutions of the system is presented.
INTEGRABLE MODELS IN STATISTICAL MECHANICS: THE HIDDEN FIELD WITH UNSOLVED PROBLEMS
Authors: McCOY BARRY M.
Published: April 2003

In the past 30 years there have been extensive discoveries in the theory of integrable statistical mechanical models including the discovery of nonlinear differential equations for Ising model correlation functions, the theory of random impurities, level crossing transitions in the chiral Potts model and the use of Rogers–Ramanujan identities to generalize our concepts of Bose/Fermi statistics. Each of these advances has led to the further discovery of major unsolved problems of great mathematical and physical interest. I will here discuss the mathematical advances, the physical insights and extraordinary lack of visibility of this field of physics.
LOOPS, SURFACES AND GRASSMANN REPRESENTATION IN TWO- AND THREE-DIMENSIONAL ISING MODELS
Authors: GATTRINGER C. R. , JAIMUNGAL S. , SEMENOFF G. W.
Published: April 2003

We construct an algebraic representation of the geometrical objects (loop and surface variables) dual to the spins in 2 and 3D Ising models. This algebraic calculus is simpler than dealing with the geometrical objects, in particular when analyzing geometry factors and counting problems. For the 2D case we give the corrected loop expansion of the free energy and the radius of convergence for this series. For the 3D case we give a simple derivation of the geometry factor which prevents overcounting of surfaces in the intrinsic geometry representation of the partition function, and find a classification of the surfaces to be summed over. For 2 and 3D we derive a compact formula for 2n-point functions in loop (surface) representation.
DUALITY INVARIANCE OF COSMOLOGICAL SOLUTIONS WITH TORSION
Authors: GANGOPADHYAY DEBASHIS , SENGUPTA SOUMITRA
Published: April 2003

We show that for a string moving in a background consisting of maximally symmetric gravity, dilaton field and second rank antisymmetric tensor field, the O(d) ⊗ O(d) transformation on the vacuum solutions gives inequivalent solutions that are not maximally symmetric. We then show that the usual physical meaning of maximal symmetry can be made to remain unaltered even if torsion is present and illustrate this through two toy models by determining the torsion fields, the metric and Killing vectors. Finally we show that under the O(d) ⊗ O(d) transformation this generalized maximal symmetry can be preserved under certain conditions. This is interesting in the context of string related cosmological backgrounds.
GAUGE INVARIANCE OF PARAMETRIZED SYSTEMS AND PATH INTEGRAL QUANTIZATION
Authors: DE CICCO HERNÁN , SIMEONE CLAUDIO
Published: April 2003

Gauge invariance of systems whose Hamilton–Jacobi equation is separable is improved by adding surface terms to the action functional. The general form of these terms is given for some complete solutions of the Hamilton–Jacobi equation. The procedure is applied to the relativistic particle and toy universes, which are quantized by imposing canonical gauge conditions in the path integral; in the case of empty models, we first quantize the parametrized system called "ideal clock," and then we examine the possibility of obtaining the amplitude for the minisuperspaces by matching them with the ideal clock. The relation existing between the geometrical properties of the constraint surface and the variables identifying the quantum states in the path integral is discussed.
TOWARD 3-D GESTURE RECOGNITION
Authors: DAVIS JAMES , SHAH MUBARAK
Published: April 2003

This paper presents a glove-free method for tracking hand movements using a set of 3-D models. In this approach, the hand is represented by five cylindrical models which are fit to the third phalangeal segments of the fingers. Six 3-D motion parameters for each model are calculated that correspond to the movement of the fingertips in the image plane. Trajectories of the moving models are then established to show the 3-D nature of the hand motion.