The J/psi 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/psi mesons were identified through their decay into muon pairs. The polar and azimuthal angles of the mu(+) were measured in the J/psi rest frame and compared to theoretical predictions at leading and next-to-leading order in QCD.

Measurement of J/psi helicity distributions in inelastic photoproduction at HERA

CAPUA, Marcella;Fazio S.;MASTROBERARDINO, Anna;Schioppa M.;TASSI, Enrico;
2009-01-01

Abstract

The J/psi 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/psi mesons were identified through their decay into muon pairs. The polar and azimuthal angles of the mu(+) were measured in the J/psi rest frame and compared to theoretical predictions at leading and next-to-leading order in QCD.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/144423
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