A Measurement of the ψ′ to J/ψ production ratio in 920 GeV proton-nucleus interactions

2006/07/24 by I. Abt, B Collaboration, Mark Raymond Adams +97 · 6 citations
Chemistry · Physics and Astronomy · #Atomic physics #Branching fraction #Chemistry #Electron #HERA #High-Energy Particle Collisions Research #Muon #Nuclear physics #Nucleus #Particle physics #Particle physics theoretical and experimental studies #Physics #Polarization (electrochemistry) #Proton #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ex

paper · pdf · doi:10.1140/epjc/s10052-006-0139-9

published as Eur.Phys.J.C49:545-558,2007 · 20 pages, 9 figures

arxiv created 2006/07/24 · openalex publication_date 2006/11/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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 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.

Citations

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• J/ψPolarization in 800-GeVp−CuInteractions

Cited by

• Measurement of D0, D+, Ds + and D*+ production in fixed target 920 GeV proton–nucleus collisions
• Decoding the phase structure of QCD via particle production at high energy
• Heavy-flavor measurements by the PHENIX experiment at RHIC
• From prompt to direct J/ψ production: new insights on the χ _c1 and χ _c2 polarizations and feed-down contributions from a global-fit analysis of mid-rapidity LHC data
• Study of ψ(2S) production and cold nuclear matter effects in pPb collisions at s N N = 5 √s_{N N}=5 TeV
• The study of gluon energy loss in cold nuclear matter from J / ψ production