CROSS-SECTION RATIO OF THE CHARMONIA STATES ψ(2S) AND J/ψ(1S) IN EXCLUSIVE PHOTOPRODUCTION AT HERA

被引：0
|
作者：
Grzelak, Grzegorz [1 ]
机构：
[1] Univ Warsaw, Warsaw, Poland
来源：
ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT | 2023年 / 16卷 / 05期
关键词：
ELECTROPRODUCTION; SCATTERING; MESONS;
D O I：
10.5506/APhysPolBSupp.16.5-A32
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The exclusive photoproduction reactions gamma*p -> J/psi(1S)p and gamma*p -> psi(2S)p have been measured with the ZEUS detector at the HERA collider. The used data sample corresponds to an integrated luminosity of 373 pb(-1) collected during the HERA-II running period. The analysis was performed in the kinematic range of 30 < W < 180 GeV, Q(2) < 1 GeV2, and vertical bar t vertical bar < 1 GeV2, where W is the photon-proton centre-of-mass energy, Q(2) is the virtuality of the photon (gamma*), and t is the squared four-momentum transfer at the proton vertex. The following decay channels were investigated: J/psi(1S) -> mu(+)mu(-), psi(2S) -> mu(+)mu(-), and psi(2S) -> J/psi(1S)pi(+)pi(-) with subsequent decay J/psi(1S) -> mu(+)mu(-).
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