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Measurement of inelastic J/psi and psi ' photoproduction at HERA
Journal article   Open access   Peer reviewed

Measurement of inelastic J/psi and psi ' photoproduction at HERA

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, R. Aggarwal, S. Antonelli, P. Antonioli, A. Antonov, M. Arneodo, O. Arslan, …
The journal of high energy physics, Vol.2013(2), pp.1-30
02/01/2013
DOI: 10.1007/JHEP02(2013)071
url
https://doi.org/10.1007/JHEP02(2013)071View
Published (Version of record) Open Access

Abstract

The cross sections for inelastic photoproduction of J/psi, and psi' mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb(-1) collected in the period 1996-2007. The psi' to J/psi cross section ratio was measured in the range 0.55 < z < 0.9 and 60 < W < 190 GeV as a function of W, z and p(T). Here W denotes the photon-proton centre-of-mass energy, z is the fraction of the incident photon energy carried by the meson and p(T) is the transverse momentum of the meson with respect to the beam axis. The J/psi cross sections were measured for 0.1 < z < 0.9, 60 < W < 240 GeV and p(T) > 1 GeV. Theoretical predictions within the non-relativistic QCD framework including NLO colour-singlet and colour-octet contributions were compared to the data, as were predictions based on the k(T)-factorisation approach.
Physical Sciences Physics Physics, Particles & Fields Science & Technology

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