Angular distributions of leptons from J / ψ ’ s produced in 920 GeV fixed-target proton-nucleus collisions


A study of the angular distributions of leptons from decays of J/ψ’s produced in p-C and p-W collisions at √ s = 41.6 GeV has been performed in the J/ψ Feynman-x region −0.34 < xF < 0.14 and for J/ψ transverse momenta up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a… (More)

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