Measurement of the Υ production cross section in 920 GeV fixed-target proton–nucleus collisions

作者: I. Abt , M. Adams , M. Agari , H. Albrecht , A. Aleksandrov

DOI: 10.1016/J.PHYSLETB.2006.04.042

关键词:

摘要: Abstract The cross section ratio R J / ψ = Br ( ϒ → l + − ) ⋅ d σ y | 0 has been measured with the HERA-B spectrometer in fixed-target proton–nucleus collisions at 920 GeV proton beam energy corresponding to a proton–nucleon c.m.s. of s 41.6 . combined results for decay channels e and μ yield 9.0 ± 2.1 × 10 −6 production per nucleon mid-rapidity determined be 4.5 1.1 pb

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