Nuclear geometry at high energy from exclusive vector meson production

被引:25
|
作者
Mantysaari, Heikki [1 ,2 ]
Salazar, Farid [3 ,4 ,5 ,6 ]
Schenke, Bjorn [7 ]
机构
[1] Univ Jyvaskyla, Dept Phys, POB 35, Jyvaskyla 40014, Finland
[2] Univ Helsinki, Helsinki Inst Phys, POB 64, Helsinki 00014, Finland
[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, Mani L Bhaumik Inst Theoret Phys, Los Angeles, CA 90095 USA
[5] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA
[6] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA
[7] Brookhaven Natl Lab, Phys Dept, Bldg 510A, Upton, NY 11973 USA
基金
芬兰科学院; 欧洲研究理事会; 美国国家科学基金会; 欧盟地平线“2020”;
关键词
INELASTIC EP SCATTERING; PB COLLISIONS; J/PSI MESONS; PHOTOPRODUCTION; ANNIHILATION; GLASMA; PROTON; MODEL;
D O I
10.1103/PhysRevD.106.074019
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
August accepted September published We show that when saturation effects are included one obtains a good description of the exclusive J/psi production spectra in ultraperipheral lead-lead collisions as recently measured by the ALICE Collaboration at the LHC. As exclusive spectra are sensitive to the spatial distribution of nuclear matter at small Bjorken-x, this implies that gluon saturation effects modify the impact parameter profile of the target as we move towards small x. In addition to saturation effects, we find a preference for larger nuclear strong -interaction radii compared to the typical charge radius. We demonstrate the role of finite photon transverse momentum and the interference between the cases for which the role of photon emitter and target are switched between the nuclei. We show that these effects are comparable to the experimental precision for pT-differential cross sections and as such need to be included when comparing to LHC data. Finally, the integrated J/psi production cross sections from the LHC and preliminary transverse momentum spectra from RHIC are shown to prefer calculations with fluctuating nucleon substructure, although these datasets would require even stronger saturation effects than predicted from our framework.
引用
收藏
页数:20
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