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Inclusive Lambda(+)(c) production in e(+)e(-) annihilations at root s=10.54 GeV and in Y(4S) decays
BaBar Collaboration
2007
发表期刊PHYSICAL REVIEW D
卷号75期号:1
通讯作者Aubert, B (reprint author), CNRS, IN2P3, Phys Particules Lab, F-74941 Annecy Le Vieux, France.
摘要We present measurements of the total production rates and momentum distributions of the charmed baryon Lambda(+)(c) in e(+)e(-)-> hadrons at a center-of-mass energy of 10.54 GeV and in Upsilon(4S) decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in e(+)e(-)-> cc events, allowing direct studies of c-quark fragmentation. We measure a momentum distribution for Lambda(+)(c) baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of < x(p)>=0.574 +/- 0.009 and a total rate of N-Lambda c(qq)=0.057 +/- 0.002(exp.)+/- 0.015(BF) Lambda(+)(c) per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, pK(-)pi(+). In Upsilon(4S) decays we measure a total rate of N-Lambda c(Upsilon)=0.091 +/- 0.006(exp.)+/- 0.024(BF) per Upsilon(4S) decay, and find a much softer momentum distribution than expected from B decays into a Lambda(+)(c) plus an antinucleon and one to three pions.
关键词HEAVY-QUARK FRAGMENTATION HADRONIC Z-DECAYS EXCITED B-MESONS ASTERISK PRODUCTION Z(0) DECAYS QCD LEP SPECTRA PHYSICS GLUONS
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.75.012003
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000243896200010
引用统计
被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212779
专题实验物理中心
作者单位中国科学院高能物理研究所
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BaBar Collaboration. Inclusive Lambda(+)(c) production in e(+)e(-) annihilations at root s=10.54 GeV and in Y(4S) decays[J]. PHYSICAL REVIEW D,2007,75(1).
APA BaBar Collaboration.(2007).Inclusive Lambda(+)(c) production in e(+)e(-) annihilations at root s=10.54 GeV and in Y(4S) decays.PHYSICAL REVIEW D,75(1).
MLA BaBar Collaboration."Inclusive Lambda(+)(c) production in e(+)e(-) annihilations at root s=10.54 GeV and in Y(4S) decays".PHYSICAL REVIEW D 75.1(2007).
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