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 / S., C., M., D., S., M., B., M., D., N., J., R., R., Y., Mck, M., P., A., G., B., L., B., D., B., A., B., G., B., F., C., M., C., G., I., A., M., R., N., A., P., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2009:(2009). [10.1088/1126-6708/2009/12/007]

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

D'AGOSTINI, Giulio;NIGRO, Andrea;
2009

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.
2009
lepton-nucleon scattering
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of J/psi helicity distributions in inelastic photoproduction at HERA / S., C., M., D., S., M., B., M., D., N., J., R., R., Y., Mck, M., P., A., G., B., L., B., D., B., A., B., G., B., F., C., M., C., G., I., A., M., R., N., A., P., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2009:(2009). [10.1088/1126-6708/2009/12/007]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/357949
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