Study of quark fragmentation in e+e- annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions.-猫眼课题宝

DOI：

10.1103/physrevd.34.3304

发表时间：

1986-12

期刊：

Physical review. D, Particles and fields

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

M. Derrick;K. Gan;P. Kooijman;J. Loos;B. Musgrave;L. Price;J. Repond;J. Schlereth;K. Sugano;J. Weiss;D. E. Wood;G. Baranko;D. Blockus;B. Brabson;J. Brom;S. Gray;C. Jung;H. Neal;H. Ogren;D. Rust;M. Valdata-Nappi;C. Akerlof;G. Bonvicini;J. Chapman;D. Errede;N. Harnew;P. Kesten;D. Meyer;D. Nitz;A. Seidl;R. Thun;T. Trinko;M. Willutzky;S. Abachi;P. Baringer;U. Mallik;I. Beltrami;B. Bylsma;R. Debonte;F. Loeffler;E. H. Low;R. McIlwain;D. Miller;C. Ng;L. K. Rangan;E. Shibata;B. Cork

本文给出了e/sup +/e/sup -/湮灭的带电粒子多重性分布。高分辨谱仪测得s = 29 GeV。在SLAC e/sup +/e/sup -/存储环PEP上获得的数据对应的综合光度为185 pb/sup -1/。讨论了用于校正观测到的尖头数的技术。带电粒子多重分布的平均值为12.87 +- 0.03 +- 0.30，色散D/sub 2/ = 3.67 +- 0.02 +- 0.18， f/sub 2/矩为0.60 +- 0.02 +- 0.18。结果也提出了一个双射流样品选择低球度和平面性。在这个能量范围内，带电粒子的分布几乎是泊松的，并且比其他e/sup +/e/sup -/实验所报道的要窄。平均多重度随着事件球度的增大而增大，对于三对称三射流事件的样本，多重度的值为= 16.3 +- 0.3 +- 0.7。当事件被垂直于推力轴的平面分成两个射流时，在两个半球的多重度之间没有观察到相关性。这一结果与软强子碰撞的情况相反，在软强子碰撞中，测量到一种强的more»正向向后相关。单喷流的平均倍数为6.43 +- 0.02 +- 0.15，色散值为D/sub 2/ = 2.55 +- 0.02 +- 0.13。这些数值进一步支持了独立射流破碎的观点。负二项分布能很好地拟合多重分布。«少

This paper presents the charged-particle multiplicity distributions for e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV measured in the High Resolution Spectrometer. The data, which correspond to an integrated luminosity of 185 pb/sup -1/, were obtained at the SLAC e/sup +/e/sup -/ storage ring PEP. The techniques used to correct the observed prong numbers are discussed. The multiplicity distribution of the charged particles has a mean value = 12.87 +- 0.03 +- 0.30, a dispersion D/sub 2/ = 3.67 +- 0.02 +- 0.18, and an f/sub 2/ moment 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 have been reported by other e/sup +/e/sup -/ experiments in this energy range. The mean multiplicity increases with the event sphericity, and for the sample of threefold-symmetric three-jet events, a value of = 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. This result is in contrast with the situation in soft hadronic collisions, where a strongmore » forward-backward correlation is measured. For the single jets, a mean multiplicity of 6.43 +- 0.02 +- 0.15 and a dispersion value of D/sub 2/ = 2.55 +- 0.02 +- 0.13 are found. These values give further support to the idea of independent jet fragmentation. The multiplicity distributions are well fit by the negative-binomial distribution.« less

Study of quark fragmentation in e+e- annihilation at 29 GeV: Charged-particle multiplicity and single-particle rapidity distributions.

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