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Measurement of J/ψ Helicity Distributions in Inelastic Photoproduction at HERA
Authors
S. Antonelli
P. Antonioli
+29 more
G. Bari
D. Bartsch
M. Basile
L. Bellagamba
M. Bindi
D. Boscherini
I. Brock
A. Bruni
G. Bruni
S. Chekanov
L. Cifarelli
F. Cindolo
A. Contin
M. Corradi
S. De Pasquale
M. Derrick
H. Hartmann
G. Iacobucci
S. Magill
A. Margotti
Margarita C. K. Mattingly
B. Musgrave
R. Nania
D. Nicholass
A. Polini
J. Repond
G. Sartorelli
R. Yoshida
A. Zichichi
Publication date
1 December 2009
Publisher
Digital Commons @ Andrews University
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 \u3c W \u3c 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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Last time updated on 10/03/2021