A Measurement of the Psi' to J/psi Production Ratio in 920 GeV Proton-Nucleus Interactions

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dc.creatorB Collaboration
dc.date2006-07-24
dc.date.accessioned2026-07-07T10:41:10Z
dc.date.available2026-07-07T10:41:10Z
dc.descriptionRatios 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 p_T < 4.5 GeV/c. The Psi' to J/psi production ratio is almost constant in the covered x_F range and shows a slow increase with p_T. 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.
dc.description20 pages, 9 figures
dc.identifierhttps://arxiv.org/abs/hep-ex/0607046
dc.identifierhttp://arxiv.org/abs/hep-ex/0607046
dc.identifierEur.Phys.J.C49:545-558,2007
dc.identifierdoi:10.1140/epjc/s10052-006-0139-9
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181547
dc.subjectHigh Energy Physics - Experiment
dc.titleA Measurement of the Psi' to J/psi Production Ratio in 920 GeV Proton-Nucleus Interactions
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