Thursday, December 20, 2012

1212.4809 (Zhong-Bo Kang et al.)

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

Zhong-Bo Kang, Bo-Wen Xiao
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.
View original: http://arxiv.org/abs/1212.4809

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