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Central exclusive χ, production at high energy colliders and gluon saturation approach
Physics Letters B ( IF 4.4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.physletb.2020.135492
F. Kopp , M.B. Gay Ducati , M.V.T. Machado

Abstract The central exclusive production of χ c and χ b at the LHC, RHIC and Tevatron energies is analyzed, using the recent unintegrated parton distribution (UGDs) functions available in the package TMDlib. Comparison with data is performed, which tests the underlying assumptions basing the theoretical approach and it can constrain the unintegrated gluon distribution function at the small-x region. Predictions for LHC energies using recent UGDs based in CCFM formalism are provided. It is explored the underlying uncertainties on this production as the choice for the unintegrated gluon distribution and factorization scale is done. Moreover, based on the parton saturation model for the gluon distribution, analytical expressions for the rapidity distributions are proposed. The prompt production of J / ψ + γ and ϒ + γ is computed for the first time for LHC energies within the very same formalism used for χ production.

中文翻译:

中心排他性χ,高能对撞机的产生和胶子饱和方法

摘要 使用 TMDlib 包中最近提供的未集成部分子分布 (UGD) 函数,分析了 LHC、RHIC 和 Tevatron 能量下 χ c 和 χ b 的中心独家产生。与数据进行比较,测试基于理论方法的基本假设,并可以约束小 x 区域的未积分胶子分布函数。提供了使用基于 CCFM 形式主义的最新 UGD 对 LHC 能量的预测。随着对非积分胶子分布和分解尺度的选择完成,探索了该产生的潜在不确定性。此外,基于胶子分布的部分饱和模型,提出了快速分布的解析表达式。
更新日期:2020-07-01
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