Forward neutral-pion transverse single-spin asymmetries in p + p collisions at sqrt[s] = 200 GeV

Physical Review Letters
B I AbelevSTAR Collaboration

Abstract

We report precision measurements of the Feynman x (xF) dependence, and first measurements of the transverse momentum (pT) dependence, of transverse single-spin asymmetries for the production of pi0 mesons from polarized proton collisions at sqrt[s] = 200 GeV. The xF dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the pT dependence at fixed xF are not consistent with these same perturbative QCD-based calculations.

References

Oct 24, 1988·Physical Review Letters·B E BonnerQ Zhu
Feb 26, 1990·Physical Review Letters·S SaroffJ J Russell
Oct 10, 2006·Physical Review Letters·Xiangdong JiFeng Yuan
Dec 13, 2006·Physical Review Letters·J AdamsUNKNOWN STAR Collaboration

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Citations

Jan 2, 2010·Cancer Chemotherapy and Pharmacology·Tsung-Fan TuanChiung-Tong Chen
Apr 9, 2016·Physical Review Letters·Daniël BoerJian Zhou
Jun 7, 2013·Physical Review Letters·Leonard GambergAlexei Prokudin
Jun 13, 2009·Physical Review Letters·S Meissner, A Metz

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