1,296 Result(s)
within
**u-**u Zhang
Physics
Elementary Particles, Quantum Field Theory
Nuclear Physics, Heavy Ions, Hadrons
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Article
Energy carried by gamma rays and neutral particles in multihadron final states at petra
The fraction of the total available energy carried by photons and the fraction carried by neutral particles of all types ine + e − multihadron final states have been measured at three centre-of-mass energies betw...
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Article
Electroweak interference effects in the high energye ++e −→e ++e −+hadrons process
We examine interference effects of the electrowcak interaction in the high energye ++e −→e + +e −+hadrons process. The effect provides a further test of the G-W-S model [1] and may lead to a better understanding ...
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Article
Prompt electron production ine + e − annihilations at 29 GeV
We have measured the inclusive prompt electron cross section over a wide momentum range (P>0.5 GeV/c) with the PEP-4 TPC detector. The semielectronic branching fractions of thec andb quarks are (9.1±0.9 (stat.)±1...
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Article
Tests of models for quark and gluon fragmentation ine + e − annihilation at \(\sqrt s = 29 GeV\)
Three currently used fragmentation models are tested by studying the distribution of particles between jet axes in the 3-jet events ofe + e − annihilation, using data collected by the Time Projection Chamber at P...
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Article
Inclusive γ and π0 production cross sections and energy fractions ine + e − annihilation at 29 GeV
Inclusive production cross sections for photons and π0's ine + e − annihilation at a center of mass energy of 29 GeV have been measured. The π0 production spectrum agrees with a corresponding measurement for π±. ...
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Article
Quark fragmentation functions and long-range correlations ine + e − annihilation at 29 GeV
We study long-range correlations between hadrons in opposite jets ine + e − annihilation events at \(\sqrt s \) =29 G...
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Article
Measurement of the photon structure functionF 2 γ (x, Q2) in the region 0.2<Q 2<7 GeV2
We present a measurement of the photon structure functionF 2 γ in the reactionee→eeX forQ 2 in the range 0.2<Q 2<7 GeV2, using 9,200 multihadron events obtain...
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Article
Relativistic corrections in coupled channel mixing
We examine relativistic effects in a coupled channel mixing calculation of corrections to charmonium energy levels. We find that the relativistic effect on the coupled channel mixing is large. Thus a relativis...
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Article
Exact calculation of the Fermion determinant in chiral QCD2 reflecting the full regularization dependence
The fermion determinant of non-abelian anomalous gauge theory in two space-time dimensions is computed using the path-integral approach. The regularization dependence of the fermion determinant is worked out. ...
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Article
The contribution of color-octet current color-octet current toD decays
Bauer and Stech pointed out that inD decaysa 1 anda 2 are approximately equal toc 1 andc 2 obtained from the renormalization group equation. This means that the non-leading 1/N c ...
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Article
Anomaly processes of the system of technions and gauge bosons
By gauging Wess-Zumino term in the technicolor model, we obtain the low energy effective action of the system of technions and gauge bosons (gluons, photon,W ± andZ 0). These actions show some new anomaly process...
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Article
Topological vacua and spontaneous CP violations in Yang-Mills theories
From the consideration of the topological structures of Yang-Mills theories, we obtain the results thatSU(2) Yang-Mills theory in the Minkowski space has the vacua of topologyZ⊕Z 2. Therefore, we argue that the p...
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Article
Measurement of electroweak parameters fromZ decays into fermion pairs
We report on the properties of theZ resonance from 62 500Z decays into fermion pairs collected with the ALEPH detector at LEP, the Large Electron-Positron storage ring at CERN. We findM Z=(91.193±0.016exp±0.030LE...
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Article
Search for low mass Higgs bosons produced inZ 0 decays
A search for light Higgs bosons was performed using the data sample collected in 1990 by the DELPHI detector at LEP, at centre of mass energies between 88.2 and 94.2 GeV. Using the process e+e−→H 0+Z 0*,Z 0*→ff, ...
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Article
Measurement of electroweak parameters from hadronic and leptonic decays of theZ 0
We have studied the reactionse + e −→hadrons,e + e −, μ+ μ− and τ+ τ−, in the energy range 88.2 \( \leqq \sqrt s \leqq 94.2\) ...
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Article
Charged particle multiplicity distributions inZ 0 hadronic decays
This paper presents an analysis of the multiplicity distributions of charged particles produced inZ 0 hadronic decays in the DELPHI detector. It is based on a sample of 25364 events. The average multiplicity is <
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Article
Charged particle multiplicity distributions in restricted rapidity intervals inZ 0 hadronic decays
The multiplicity distributions of charged particles in restricted rapidity intervals inZ 0 hadronic decays measured by the DELPHI detector are presented. The data reveal a shoulder structure, best visible for int...
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Article
Energy, target, projectile and multiplicity dependences of intermittency behaviour in high energy O(Si, S) induced interactions
Fluctuations of charged particles in high energy oxygen, silicon and sulphur induced interactions are investigated with the method of scaled factorial moments. It is found that for decreasing bin size down to ...
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Article
Dynamical supersymmetry breaking and gauge anomalies
Some aspects of supersymmetric gauge theories and discussed. It is shown that dynamical supersymmetry breaking does not occur in supersymmetric QED in higher dimensions. The cancellation of both local (perturb...
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Article
Studies of hadronic event structure and comparisons with QCD models at theZ 0 resonance
The structure of hadronic events fromZ 0 decay is studied by measuring event shape variables, factorial moments, and the energy flow distribution. The distributions, after correction for detector effects and init...
