Measurement of J /ψ helicity distributions in inelastic photoproduction at HERAстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The J /ψ decay angular distributions have been measured in inelastic photoproduction in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb −1 . The range in photon-proton centre-of-mass energy, W , was 50 < W < 180 GeV. The J /ψ mesons were identified through their decay into muon pairs. The polar and azimuthal angles of the μ + were measured in the J /ψ rest frame and compared to theoretical predictions at leading and next-to-leading order in QCD.