Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-01-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 17 figues; v2: minor corrections, a subsection, discussion and references added
Scientific paper
We propose a new mechanism for generating a single transverse spin asymmetry (STSA) in polarized proton--proton and proton-nucleus collisions in the high-energy scattering approximation. In this framework the STSA originates from the q -> q G splitting in the projectile (proton) light-cone wave function followed by a perturbative (C-odd) odderon interaction, together with a C-even interaction, between the projectile and the target. We show that the obtained expression for the STSA of the produced quarks is in qualitative agreement with experiment: STSA decreases with decreasing projectile x_F and is a non-monotonic function of the transverse momentum k_T, peaking near the saturation scale Q_s in our framework. Our mechanism predicts that the quark STSA in proton-nucleus collisions should be much smaller than in proton-proton collisions. We also observe that in our formalism the STSA for prompt photons is zero.
Kovchegov Yuri V.
Sievert Matthew D.
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