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Universality in nuclear dependence coefficient $α(q_T)$

Xiaofeng Guo·Jianwei Qiu·Xiaofei Zhang
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Abstract

We derive the nuclear dependence coefficient $α(q_T)$ for Drell-Yan and J/$ψ$ production. We show that at small $q_T$, the $α(q_T)$ is given by an universal functional form: $α(q_T)=a+b q_T^2$, and the parameters $a$ and $b$ are completely determined by either perturbatively calculable or independently measurable quantities. This universal functional form $α(q_T)$ is insensitive to the $A$, and is consistent with existing data.

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Xiaofeng Guo, Jianwei Qiu, Xiaofei Zhang. 2000-02-17. Universality in nuclear dependence coefficient $α(q_T)$. https://doi.org/10.1103/physrevlett.84.5049

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