Sivers asymmetry of Drell-Yan production in small-$x$ regime

Abstract

We study the Sivers single spin asymmetry of the Drell-Yan lepton pair production in the small-$x$ regime. We find that in the corresponding kinematic region the spin asymmetry calculated in the small-$x$ approach is consistent with either the usual transverse-momentum-dependent factorization formalism or the collinear factorization formalism, respectively. We estimate the Sivers asymmetry for both polarized p+p and p+A collisions and argue that the Drell-Yan production is an interesting and unique probe for both the transverse spin physics and the small-$x$ saturation effect.

12 pages, 4 figures

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Cited by in corpus (4)

• Transverse single spin asymmetry in direct photon production in polarized pA collisions
• Transverse spin observables in hard-scattering hadronic processes within collinear factorization
• Color entanglement for $\gamma$-jet production in polarized pA collisions
• Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference