Exclusive ρ and J/Ψ photoproduction in ultraperipheral pA collisions: Predictions of the gluon saturation models for the momentum transfer distributions

被引：25

作者：

Goncalves, V. P. ^{[1
]}

Navarra, F. S. ^{[2
]}

Spiering, D. ^{[2
]}

机构：

[1] Univ Fed Pelotas, Inst Fis & Matemat, Caixa Postal 354, BR-96010900 Pelotas, RS, Brazil

[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, SP, Brazil

来源：

PHYSICS LETTERS B | 2019年 / 791卷

基金：

巴西圣保罗研究基金会;

关键词：

VECTOR-MESON PHOTOPRODUCTION; DEPENDENCE; PHYSICS; GAMMA;

D O I：

10.1016/j.physletb.2019.03.007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this letter we complement previous studies on exclusive vector meson photoproduction in hadronic collisions presenting a comprehensive analysis of the t-spectrum measured in exclusive rho and J/Psi photoproduction in pA collisions at the LHC. We compute the differential cross sections considering two phenomenological models for the gluon saturation effects and present predictions for pPb and pCa collisions. Moreover, we compare our predictions with the recent preliminary CMS data for the exclusive rho photoproduction. We demonstrate that the gluon saturation models are able to describe the CMS data at small - t. On the other hand, the models underestimate the few data point at large - t. Our results indicate that future measurements of the large - t region can be useful to probe the presence or absence of a dip in the t-spectrum and discriminate between the different approaches to the gluon saturation effects. (C) 2019 The Author(s). Published by Elsevier B.V.

引用

页码：299 / 304

页数：6

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