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AbstractAbstract
[en] Published in summary form only
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International meeting on physics at KAON: Hadron spectroscopy, strangeness, rare decays; Bad Honnef (Germany, F.R.); 7-9 Jun 1989
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Journal Article
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Conference
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ANNIHILATION, ANTIKAONS, ANTILAMBDA PARTICLES, ANTIPROTON REACTIONS, BRANCHING RATIO, CASCADE SHOWERS, CASCADE THEORY, ETA MESONS, GEV RANGE 01-10, KAON-NUCLEON INTERACTIONS, KAONS NEUTRAL SHORT-LIVED, NEON 20 TARGET, NUCLEAR REACTION KINETICS, NUCLEAR REACTION YIELD, NUCLEON-ANTINUCLEON INTERACTIO, NUCLEONS, PARTICLE PRODUCTION, PARTICLE RAPIDITY, PIONS, RELATIVISTIC RANGE, RESCATTERING, SIGMA PARTICLES, STATISTICAL MODELS, TANTALUM 181 TARGET, TRANSVERSE MOMENTUM
ANTIBARYONS, ANTIHYPERONS, ANTIMATTER, ANTINUCLEON REACTIONS, ANTIPARTICLES, BARYON REACTIONS, BARYON-BARYON INTERACTIONS, BARYONS, BOSONS, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, GEV RANGE, HADRON REACTIONS, HADRON-HADRON INTERACTIONS, HADRONS, HYPERONS, INTERACTIONS, KAONS, KAONS NEUTRAL, KINETICS, LAMBDA BARYONS, LAMBDA PARTICLES, LINEAR MOMENTUM, MATHEMATICAL MODELS, MATTER, MESON-BARYON INTERACTIONS, MESON-NUCLEON INTERACTIONS, MESONS, NUCLEAR REACTIONS, NUCLEON REACTIONS, PARTICLE INTERACTIONS, PARTICLE PROPERTIES, PSEUDOSCALAR MESONS, REACTION KINETICS, SCATTERING, SHOWERS, SIGMA BARYONS, STRANGE MESONS, STRANGE PARTICLES, TARGETS
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Astone, P.; De Pedis, D.; Visco, M.; Bassan, M.; Coccia, E.; Modena, I.; Bates, S.; Cavallari, G.; Muratori, G.; Price, M.; Bizzarri, R.; Cardarelli, R.; Degasperis, A.; Frasca, S.; Majorana, E.; Merucci, L.; Pallottino, G.V.; Patrignani, C.; Pizzella, G.; Rapagnani, P.; Ricci, F.; Bonifazi, P.; Majorana, E.1991
AbstractAbstract
[en] We present a detailed analysis of the effect of the gravitational field generated by a small rotating quadrupole on a gravitational wave antenna and we report on the preliminary measurement of this effect on the Explorer 2270 kg cryogenic gravitational wave antenna of the Rome group. The induced signal had an amplitude twenty times larger than the detector noise when the antenna was equipped with an FET amplifier and was easily detected without requiring integration in time. We remark that with this method we were able to make an absolute calibration of a gravitational wave antenna. (orig.)
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Journal Article
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[en] We extend the superspace treatment of higher derivative supersymmetric Yang-Mills theories, emphasizing the role played by manifest D=10 Lorentz covariance and supersymmetry invariance. As an example, the superspace formulation of the effective action is considered for the massless fields in the open superstring, as well as in the SO(32) and E8xE8 superstring theories. We show that there exists a unique modification of the f-tensor supercurrent which can provide the embedding of the O(α'3) string corrections in the slope parameter expansion for the Yang-Mills sector in D=10 superspace. The new correction term is relevant for the understanding of nonperturbative effects. (orig.)
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Journal Article
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ACTION INTEGRAL, ALGEBRAIC CURRENTS, CORRECTIONS, DIFFERENTIAL CALCULUS, DUALITY, INTERMEDIATE VECTOR BOSONS, LAGRANGIAN FIELD THEORY, LORENTZ INVARIANCE, MANY-DIMENSIONAL CALCULATIONS, MASSLESS PARTICLES, MATHEMATICAL SPACE, PERTURBATION THEORY, POWER SERIES, SO GROUPS, STRING MODELS, SUPERSYMMETRY, UNIFIED GAUGE MODELS, VECTOR FIELDS, YANG-MILLS THEORY
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Dahmen, H.D.; Manakos, P.; Mannel, T.
Darmstadt-Siegen Collaboration1991
Darmstadt-Siegen Collaboration1991
AbstractAbstract
[en] We describe how to apply the unitary approximation to high energy scattering processes which involve the radiation of arbitrarily many photons. We compare our results to calculations of inclusive quantities using leading log resummation techniques well known from QCD. In contrast to the latter method the unitary approximation is also appropriate for differential cross sections. The Monte Carlo implementation of the method is discussed and detailed results are given for the case of radiative Bhabha scattering. (orig.)
Primary Subject
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Journal Article
Literature Type
Numerical Data
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Country of publication
ANGULAR CORRELATION, BHABHA SCATTERING, BORN APPROXIMATION, COMPUTERIZED SIMULATION, DIFFERENTIAL CROSS SECTIONS, ELECTRON-POSITRON INTERACTIONS, ELECTRONS, ENERGY DEPENDENCE, ENERGY SPECTRA, EXCITATION FUNCTIONS, GAMMA SPECTRA, GEV RANGE 10-100, INCLUSIVE INTERACTIONS, INTEGRAL CROSS SECTIONS, MATRIX ELEMENTS, MONTE CARLO METHOD, MULTI-PHOTON PROCESSES, NEUTRAL-CURRENT INTERACTIONS, PHOTONS, POSITRONS, PROBABILITY, PROGRAMMING, QUANTUM ELECTRODYNAMICS, RECURSION RELATIONS, RELATIVISTIC RANGE, SCATTERING AMPLITUDES, THEORETICAL DATA, U CODES, UNITARITY, VECTOR CURRENTS
ALGEBRAIC CURRENTS, AMPLITUDES, ANTILEPTONS, ANTIMATTER, ANTIPARTICLES, BOSONS, COMPUTER CODES, CORRELATIONS, CROSS SECTIONS, CURRENTS, DATA, ELASTIC SCATTERING, ELECTRODYNAMICS, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FIELD THEORIES, GEV RANGE, INFORMATION, INTERACTIONS, LEPTON-LEPTON INTERACTIONS, LEPTONS, MASSLESS PARTICLES, MATTER, NUMERICAL DATA, PARTICLE INTERACTIONS, QUANTUM FIELD THEORY, SCATTERING, SIMULATION, SPECTRA
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[en] We reanalyse the pionic form factor by using perturbative QCD theory and contributions from endpoint regions. We find that the perturbative QCD can be applied to the pionic form factor as Q2>4 GeV2 and they become unreliable as Q2≤4 GeV2. Therefore the applicability of perturbative QCD to the form factor is questionable only as Q2≤4 GeV2. (orig.)
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Journal Article
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Numerical Data
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[en] This paper presents an analysis of the multiplicity distributions of charged particles produced in Z0 hadronic decays in the DELPHI detector. It is based on a sample of 25 364 events. The average multiplicity is < nch>=20.71±0.04(stat)±0.77(syst) and the dispersion D=6.28±0.03(stat)±0.43(syst). The data are compared with the results at lower energies and with the predictions of phenomenological models. The Lund parton shower model describes the data reasonably well. The multiplicity distributions show approximate KNO-scaling. They also show positive forward-backward correlations that are strongest in the central region of rapidity and for particles of opposite charge. (orig.)
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Journal Article
Literature Type
Numerical Data
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BOSONS, CORRELATIONS, DATA, DECAY, ELEMENTARY PARTICLES, ENERGY RANGE, GEV RANGE, INFORMATION, INTERACTIONS, INTERMEDIATE BOSONS, INTERMEDIATE VECTOR BOSONS, LEPTON-LEPTON INTERACTIONS, MATHEMATICAL SPACE, NUMERICAL DATA, PARTICLE DECAY, PARTICLE INTERACTIONS, PARTICLE PRODUCTION, SPACE, WEAK PARTICLE DECAY
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[en] Radiative corrections to W pair production in e+e--annihilation are investigated. In an earlier work we discussed only the weak corrections to this process. Here we present the complete calculation including QED corrections. Full agreement with other authors is achieved. We use the helicity formalism for the projection of the S-matrix into invariant amplitudes and study the dependence of cross sections on the Higgs and top masses. Effects due to the choice of the renormalization scheme are considered. (orig.)
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Secondary Subject
Source
GRANT CPBP 01.03
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Journal Article
Literature Type
Numerical Data
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ANGULAR DISTRIBUTION, ANNIHILATION, BORN APPROXIMATION, BREMSSTRAHLUNG, DIFFERENTIAL CROSS SECTIONS, ELECTRON-POSITRON INTERACTIONS, ENERGY DEPENDENCE, FEYNMAN DIAGRAM, GEV RANGE 100-1000, HELICITY, HIGGS BOSONS, INTEGRAL CROSS SECTIONS, PAIR PRODUCTION, POLARIZED PRODUCTS, QUANTUM ELECTRODYNAMICS, QUARKS, RADIATIVE CORRECTIONS, RENORMALIZATION, REST MASS, S MATRIX, SCATTERING AMPLITUDES, SPIN ORIENTATION, THEORETICAL DATA, TOP PARTICLES, W MINUS BOSONS, W PLUS BOSONS
AMPLITUDES, BOSONS, CORRECTIONS, CROSS SECTIONS, DATA, DIAGRAMS, DISTRIBUTION, ELECTRODYNAMICS, ELECTROMAGNETIC RADIATION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FIELD THEORIES, GEV RANGE, INFORMATION, INTERACTIONS, INTERMEDIATE BOSONS, INTERMEDIATE VECTOR BOSONS, LEPTON-LEPTON INTERACTIONS, MASS, MATRICES, NUMERICAL DATA, ORIENTATION, PARTICLE INTERACTIONS, PARTICLE PRODUCTION, PARTICLE PROPERTIES, POSTULATED PARTICLES, QUANTUM FIELD THEORY, RADIATIONS
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[en] The operator-product expansion will be employed to obtain the lowest-order, quark condensate component of both the gluon self-energy and the ρ meson correlation function to all orders in the quark mass parameter. Field-theoretic aspects of the self-energy and correlation function will be considered, and physical effects to the quark condensate upon gluon mass generation will be examined. (orig.)
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Journal Article
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[en] From a model independent analysis of the panti p differential elastic cross section at √s=53 and 546 GeV we have tried to extract the semi-hard QCD component in the eikonal. Our conclusions are: 1) The hadronic form factor for semi-hard interaction has a radius slightly smaller than the electromagnetic radius, < r2>SH1/2=0.66 fm; 2) the total inelastic semi-hard cross section at 546 GeV is σSH≅15 mb, not very different from the minijet cross section measured by the UA1 Collaboration. (orig.)
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Journal Article
Literature Type
Numerical Data
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ANTIPROTONS, DIFFERENTIAL CROSS SECTIONS, EIKONAL APPROXIMATION, ELASTIC SCATTERING, FORM FACTORS, GEV RANGE 100-1000, GEV RANGE 10-100, INTEGRAL CROSS SECTIONS, JET MODEL, MULTIPLE PRODUCTION, NUCLEON-ANTINUCLEON INTERACTIO, PROTON-ANTIPROTON INTERACTIONS, PROTONS, QUANTUM CHROMODYNAMICS, THEORETICAL DATA
ANTIBARYONS, ANTIMATTER, ANTINUCLEI, ANTINUCLEONS, ANTIPARTICLES, BARYON-BARYON INTERACTIONS, BARYONS, CATIONS, CHARGED PARTICLES, CROSS SECTIONS, DATA, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FIELD THEORIES, GEV RANGE, HADRON-HADRON INTERACTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INFORMATION, INTERACTIONS, IONS, MATHEMATICAL MODELS, MATTER, NUCLEI, NUCLEONS, NUMERICAL DATA, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PRODUCTION, PARTICLE PROPERTIES, QUANTUM FIELD THEORY, SCATTERING
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[en] In this paper the BKS kernels of BRST bosonic strings are given. And from the kernels the relationships between geometric quantization and path integral quantization of bosonic strings with BRST symmetry are established. At the classical level, we also prove that the symplectic form in the phase space of bosonic strings is BRST invariant and non-degenerate. (orig.)
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