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. ISSN 0550-3213, 1873-1562

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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<Q<sup>2</sup><80 GeV<sup>2</sup>, 30<W<210 GeV and |t|<1 GeV<sup>2</sup>, where Q<sup>2</sup> 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<Q<sup>2</sup><5 GeV<sup>2</sup> were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb<sup>−1</sup>. The data for 5<Q<sup>2</sup><80 GeV<sup>2</sup> are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb<sup>−1</sup>. The decay modes analysed were μ<sup>+</sup>μ<sup>−</sup> and J/ψ(1S)π<sup>+</sup>π<sup>−</sup> for the ψ(2S) and μ<sup>+</sup>μ<sup>−</sup> for the J/ψ(1S). The cross-section ratio σ<inf>ψ(2S)</inf>/σ<inf>J/ψ(1S)</inf> has been measured as a function of Q<sup>2</sup>,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: 17 Jun 2025 07:27
DOI: 10.1016/j.nuclphysb.2016.06.010
Open Access URL: https://arxiv.org/abs/1606.08652
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3005425