Measurement of the cross-section ratio σ<sub>ψ(2<i>S</i>)</sub>/σ<sub><i>J</i>/ψ(1<i>S</i>)</sub> in deep inelastic exclusive <i>ep</i> scattering at HERA



Abramowicz, H, Abt, I, Adamczykh, L, Adamus, M, Antonelli, S, Aushev, V, Aushev, Y, Behnke, O, Behrens, U, Bertolin, A
et al (show 136 more authors) (2016) Measurement of the cross-section ratio σ<sub>ψ(2<i>S</i>)</sub>/σ<sub><i>J</i>/ψ(1<i>S</i>)</sub> in deep inelastic exclusive <i>ep</i> scattering at HERA. NUCLEAR PHYSICS B, 909. pp. 934-953.

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Abstract

The exclusive deep inelastic electroproduction of ψ(2S) and J/ψ(1S) at an ep centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinematic range 2<Q2<80 GeV2, 30<W<210 GeV and |t|<1 GeV2, where Q2 is the photon virtuality, W is the photon–proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The data for 2<Q2<5 GeV2 were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb−1. The data for 5<Q2<80 GeV2 are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb−1. The decay modes analysed were μ+μ− and J/ψ(1S)π+π− for the ψ(2S) and μ+μ− for the J/ψ(1S). The cross-section ratio σψ(2S)/σJ/ψ(1S) has been measured as a function of Q2,W  and t. The results are compared to predictions of QCD-inspired models of exclusive vector-meson production.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 27 Jan 2017 15:40
Last Modified: 21 Jun 2024 05:42
DOI: 10.1016/j.nuclphysb.2016.06.010
Open Access URL: https://arxiv.org/abs/1606.08652
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3005425