Universality in nuclear dependence coefficient $α(q_T)$

Details Universality in nuclear dependence coefficient $α(q_T)$ Universality in nuclear dependence coefficient $α(q_T)$

1999-11-24

arxiv.org/abs/hep-ph/9911476v3

Phys.Rev.Lett. 84 (2000) 5049-5052

Physics

High Energy Physics

High Energy Physics - Phenomenology

latex, 4 pages, 3 figures, slightly revised

Scientific paper

10.1103/PhysRevLett.84.5049

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

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