A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions
HERA-B Collaboration
刊名EUROPEAN PHYSICAL JOURNAL C
2007
卷号49期号:2页码:#REF!
学科分类Physics
DOI10.1140/epjc/s10052-006-0139-9
通讯作者Abt, I (reprint author), Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany.
文章类型Article
英文摘要Ratios of the psi' over the J/psi production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The psi' and J/psi states were reconstructed in both the mu(+) mu(-) and the e(+) e(-) decay modes. The measurements covered the kinematic range -0.35 <= x(F)<= 0.1 with transverse momentum >= 4.5 GeV/c. The angular dependence of the ratio has been used to measure the difference of the psi' and J/psi polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is R-psi'(mu)/R-psi'(e)=1.00 +/- 0.08 +/- 0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B' (mu)B(e))/(B(mu)B'(e)), of psi' and J/psi in the two channels. The psi' to J/psi production ratio is almost constant in the covered x(F) range and shows a slow increase with p(T).
类目[WOS]Physics, Particles & Fields
收录类别SCI
WOS记录号WOS:000243973100010
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被引频次:30[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/311005/227718
专题中国科学院高能物理研究所_实验物理中心_期刊论文
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HERA-B Collaboration. A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions[J]. EUROPEAN PHYSICAL JOURNAL C,2007,49(2):#REF!.
APA HERA-B Collaboration.(2007).A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions.EUROPEAN PHYSICAL JOURNAL C,49(2),#REF!.
MLA HERA-B Collaboration."A Measurement of the psi ' to J/psi production ratio in 920 GeV proton-nucleus interactions".EUROPEAN PHYSICAL JOURNAL C 49.2(2007):#REF!.
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