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

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

2009-06-08

arxiv.org/abs/0906.1424v1

JHEP 0912:007,2009

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages

Scientific paper

10.1088/1126-6708/2009/12/007

The $J/\psi$ decay angular distributions have been measured in inelastic photoproduction in $e p$ 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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