衍射深度非弹性散射中的饱和效应

中文摘要 AI 辅助

我们研究光子诱导过程中粲夸克（$c$）和底夸克（$b$）的产生，以此作为胶子饱和的探针，重点关注大型强子对撞机（LHC）超周边碰撞（UPC）可及的高能区域。我们分别采用偶极振幅演化的非线性Balitsky–Kovchegov方程和线性Balitsky–Fadin–Kuraev–Lipatov方程，对比含与不含饱和效应时，包容性及衍射重夸克产生的预测结果。饱和模型中相干衍射事例的占比约为20%，约为基于部分子分布函数与遮蔽效应的预测值的两倍。这表明，对UPC中衍射重夸克产生的测量，或可为区分量子色动力学的线性与非线性区域提供灵敏探针。

英文摘要

We study the production of $c$ and $b$ quarks in photon-induced processes as a probe of gluon saturation, with a focus on the high-energy region accessible in ultra-peripheral collisions (UPCs) at the LHC. We compare predictions for inclusive and diffractive heavy quark production with and without saturation effects by using the nonlinear Balitsky--Kovchegov and the linear Balitsky--Fadin--Kuraev--Lipatov equations for the evolution of the dipole amplitude. The percentage of coherent diffractive events is predicted to be $~20\%$ in the saturation model, which is approximately twice as large as predictions based on parton distribution functions and shadowing. This indicates that measurements of diffractive heavy quark production in UPCs may provide a sensitive probe for distinguishing linear and nonlinear regimes of quantum chromodynamics.

发表机构

• University of California, Los Angeles（加州大学洛杉矶分校）
• Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles（加州大学洛杉矶分校马尼·L·巴乌米克理论物理研究所）
• The University of Kansas（堪萨斯大学）
• The University of Helsinki（赫尔辛基大学）

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