TY - JOUR
T1 - Testing the process dependence of the Sivers function via hadron distributions inside a jet
AU - D'Alesio, Umberto
AU - Gamberg, Leonard
AU - Kang, Zhong Bo
AU - Murgia, Francesco
AU - Pisano, Cristian
N1 - Funding Information:
We are grateful to M. Anselmino for carefully reading the manuscript. This work was supported in part by U.S. Department of Energy under Grant No. DE-FG02-07ER41460 (L.G.) and Contract No. DE-AC02-98CH10886 (Z.K.). U.D. and F.M. acknowledge partial support by Italian MIUR under PRIN 2008, and by the European Community under the FP7 grant agreement No. 227431 . C.P. is supported by Regione Autonoma della Sardegna under grant PO Sardegna FSE 2007-2013, L.R. 7/2007.
PY - 2011/10/25
Y1 - 2011/10/25
N2 - We study the process dependence of the Sivers function by considering the impact of color-gauge invariant initial and final state interactions on transverse spin asymmetries in proton-proton scattering reactions within the framework of the transverse momentum dependent (TMD), generalized parton model. To this aim, we consider the azimuthal distribution of leading pions inside a fragmenting jet as well as single inclusive jet asymmetry in polarized proton-proton collisions. In contrast to single inclusive pion production, in both cases we can isolate the Sivers contribution and thereby study its process dependence. The predictions for the Sivers asymmetry obtained with and without inclusion of color gauge factors are comparable in size but with opposite signs. We conclude that both processes represent unique opportunities to discriminate among the two approaches and test the universality properties of the Sivers function in hadronic scattering reactions.
AB - We study the process dependence of the Sivers function by considering the impact of color-gauge invariant initial and final state interactions on transverse spin asymmetries in proton-proton scattering reactions within the framework of the transverse momentum dependent (TMD), generalized parton model. To this aim, we consider the azimuthal distribution of leading pions inside a fragmenting jet as well as single inclusive jet asymmetry in polarized proton-proton collisions. In contrast to single inclusive pion production, in both cases we can isolate the Sivers contribution and thereby study its process dependence. The predictions for the Sivers asymmetry obtained with and without inclusion of color gauge factors are comparable in size but with opposite signs. We conclude that both processes represent unique opportunities to discriminate among the two approaches and test the universality properties of the Sivers function in hadronic scattering reactions.
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U2 - 10.1016/j.physletb.2011.09.067
DO - 10.1016/j.physletb.2011.09.067
M3 - Article
AN - SCOPUS:80053609775
SN - 0370-2693
VL - 704
SP - 637
EP - 640
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 5
ER -