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

Abstract:
The J/ψ decay angular distributions have been measured in inelastic photo-production 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. © SISSA 2009.

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Journal:
Journal of High Energy Physics
Volume:
2009
Issue:
12
Publication date:
2009-01-01
DOI:
EISSN:
1029-8479
ISSN:
1126-6708
URN:
uuid:e3f08a0a-f721-4255-8777-cc10add9affc
Source identifiers:
216401
Local pid:
pubs:216401
Language:
English
Keywords:

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