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Multiplicity Distributions In E E Annihilation At 29 Gev
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Book Synopsis Multiplicity Distributions in Ee− Annihilation at 29 GeV. by :
Download or read book Multiplicity Distributions in Ee− Annihilation at 29 GeV. written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the charged particle multiplicity distributions of ee− annihilation at .sqrt. s = 29 GeV measured in the High Resolution Spectrometer. The data, which corresponds to an integrated luminosity of 185 pb−1, were obtained at the ee− storage ring PEP. The multiplicity distribution of the charged particles has a mean value n = 12.87 +- 0.03 +- 0.30, a dispersion D2 = 3.67 +- 0.02 +- 0.18, and an f2 momentum of 0.60 +- 0.02 +- 0.18. Results are also presented for a two-jet sample selected with low sphericity and aplanarity. The charged particle distributions are almost Poissonian and narrower than results reported by other e+e− experiments in this energy range. The mean multiplicity increases with the event sphericity and for the sample of three-fold-symmetric three-jet events, a value of n = 16.3 +- 0.3 +- 0.7 is found. No correlation is observed between the multiplicities in the two hemispheres when the events are divided into two jets by a plane perpendicular to the thrust axis. For the single jets, a mean multiplicity of n = 6.43 +- 0.02 +- 0.15 and dispersion value of D2 = 2.55 +- 0.02 +- 0.13 are found. These values give further support to the idea of independent jet fragmentation. 20 refs., 13 figs.
Book Synopsis Multiplicity Distributions in Ee− Annihilation at 29 GeV by :
Download or read book Multiplicity Distributions in Ee− Annihilation at 29 GeV written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The charged particle multiplicity distributions for single jets in ee− annihilation at 29 GeV have been measured using the High Resolution Spectrometer at PEP. The shape of the distribution agrees well with a Poisson distribution. No correlation is observed between the multiplicities in the two jets of an event. For fixed values of the prong number of the total event, the multiplicity sharing between the two jets is in good agreement with a binomial distribution. These observations are contrasted to the results from soft hadronic collisions and conclusions are drawn about the nature of clusters. 21 refs., 4 figs.
Book Synopsis Study of Quark Fragmentation in Ee− Annihilation at 29 GeV by :
Download or read book Study of Quark Fragmentation in Ee− Annihilation at 29 GeV written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the charged particle multiplicity distributions for ee− annihilation at .sqrt.s = 29 GeV measured in the High Resolution Spectrometer. The data, which correspond to an integrated luminosity of 185 pb−1, were obtained at the ee− storage ring PEP. The techniques used to obtain the original distributions from the observed prong numbers are discussed. The multiplicity distribution of the charged particles with a two jet selection has a mean value Nch = 13.02 +- 0.03 +- 0.5; and a dispersion D = 3.84 +- 0.02 +- 0.1. The mean multiplicity increases with the event sphericity. No correlation is observed between the multiplicities in the two jets that characterize most of the events. For the single jets a value of D = 2.71 +- 0.02 +- 0.06 is measured which gives further support the idea of independent jet fragmentation. When compared with e+e− data at other energies, the multiplicity distributions exhibit the scaling behavior in the mean first suggested by Koba, Nielsen and Olsen (KNO). The KNO distribution in the central rapidity interval is broader than that for the whole rapidity span and agrees well with the generalized Bose-Einstein formula for three independent sources. 17 refs., 14 figs.
Book Synopsis Multiplicity Distributions in E+e- Annihilation at 29 GeV by :
Download or read book Multiplicity Distributions in E+e- Annihilation at 29 GeV written by and published by . This book was released on 1986 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive Distributions and Two Particle Correlations in E+e± Annihilation at 29 GeV Center-of-mass Energy by : Marjorie Shapiro
Download or read book Inclusive Distributions and Two Particle Correlations in E+e± Annihilation at 29 GeV Center-of-mass Energy written by Marjorie Shapiro and published by . This book was released on 1984 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 1294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis E-e− Hadronic Multiplicity Distributions by :
Download or read book E-e− Hadronic Multiplicity Distributions written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The 29 GeV multiplicity data have been analyzed for e -e− .-->. hadrons using the partially coherent laser distribution (PCLD). The latter interpolates between the negative binomial and Poisson distributions as the ratio S/N of coherent/incoherent multiplcity varies from zero to infinity. The negative binomial gives an excellent fit for rather large values of the cell parameter k. Equally good fits (for full and partial rapidity range, and for the forward/backward 2 jet correlation) are obtained for the mostly coherent (almost Poissonian) PCLD with small values of k (equal to the number of jets). The reasons for the existence of this tradeoff are explained in detail. The existence of the resulting ambiguity is traced to the insensitivity of the probability distribution to phase information in the hadronic density matrix. The study of higher order correlations (intensity interferometry) among like sign-particles is recommended to resolve this question.
Book Synopsis Total and Inclusive Hadron Production by Ee− Annihilation at [square Root Symbol]S by : James Fraser Patrick
Download or read book Total and Inclusive Hadron Production by Ee− Annihilation at [square Root Symbol]S written by James Fraser Patrick and published by . This book was released on 1982 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive Lepton Production in Hadronic Events from Ee− Annihilation at 29 GeV by : Mark Everett Nelson
Download or read book Inclusive Lepton Production in Hadronic Events from Ee− Annihilation at 29 GeV written by Mark Everett Nelson and published by . This book was released on 1983 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charged-particle Multiplicity Distributions in E+e- Annihilation and Negative Binomial Distributions by : C. K. Chew
Download or read book Charged-particle Multiplicity Distributions in E+e- Annihilation and Negative Binomial Distributions written by C. K. Chew and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive Hadron Production and Two Particle Correlations in Ee− Annihilation at 29 GeV Center-of-mass Energy by :
Download or read book Inclusive Hadron Production and Two Particle Correlations in Ee− Annihilation at 29 GeV Center-of-mass Energy written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied hadron production in ee− annihilation at 29 GeV center-of-mass energy using the PEP-4 Time Projection Chamber Detector. The inclusive cross sections and mean multiplicities for .pi./sup + -/, K/sup + -/ and (p + anti p) production have been measured using ionization energy loss to separate particle species. We find on average 10.7 +- 0.6 .pi./sup + -/, 1.35 +- 13 K/sup + -/ and 0.60 +- 0.08 (p + anti p) per multihadron event. The differential cross section is well described by a number of Monte Carlo hadronization models. In addition, we have observed correlations in rapidity space for identified pions and kaons. Short-range KK correlations provide evidence for local flavor compensation during hadronization. Long-range .pi pi. and KK correlations indicate that the initial partons carry flavor. We also observe significant long-range .pi. K correlations as a result of heavy quark decays. 85 references, 67 figures, 11 tables.
Book Synopsis D Meson Production in E+e− Annihilation by : Petros-Afentoulis Rapidis
Download or read book D Meson Production in E+e− Annihilation written by Petros-Afentoulis Rapidis and published by . This book was released on 1979 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charged multiplicity distributions and correlations in e+e- [ee] annihilation at PETRA energies by : Deutsches Elektronen-Synchrotron (Hamburg).
Download or read book Charged multiplicity distributions and correlations in e+e- [ee] annihilation at PETRA energies written by Deutsches Elektronen-Synchrotron (Hamburg). and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive D0 Production in E+e Annihilation at 29 GeV by : Raymond Eugene Van Tyen
Download or read book Inclusive D0 Production in E+e Annihilation at 29 GeV written by Raymond Eugene Van Tyen and published by . This book was released on 1989 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tests of Models for Parton Fragmentation in E E Annihilation. [29 GeV Center-of-mass Energy]. by :
Download or read book Tests of Models for Parton Fragmentation in E E Annihilation. [29 GeV Center-of-mass Energy]. written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We examine the distribution of particles in the three jet events of e e annihilation. The data was collected with the PEP-4/Time Projection Chamber detector at 29 GeV center-of-mass energy at PEP. The experimental distributions are compared to the predictions of several fragmentation models which describe the transition of quarks and gluons into hadrons. In particular, our study emphasizes the three fragmentation models which are currently in widest use: the Lund string model, the Webber cluster model and the independent fragmentation model. These three models each possess different Lorentz frame structures for the distribution of hadron sources relative to the overall event c.m. in three jet events. The Lund string and independent fragmentation models are tuned to describe global event properties of our multihadronic annihilation event sample. This tuned Lund string model provides a good description of the distribution of particles between jet axes in three jet events, while the independent fragmentation model does not. We verify that the failure of the independent fragmentation model is not a consequence of parameter tuning or of model variant. The Webber cluster model, which is untuned, does not describe the absolute particle densities between jets but correctly predicts the ratios of those densities, which are less sensitive to the tuning. These results provide evidence that the sources of hadrons are boosted with respect to the overall center-of-mass in three jet events, with components of motion normal to the jet axes. The distribution of particles close to jet axes provides additional support for this conclusion. 94 refs.
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