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Testing the universality of the Collins function in pion-jet production at RHIC

PISANO, CRISTIAN
2017-01-01
2017
PHYSICS LETTERS. SECTION B
sì
2-s2.0-85029527169
Esperti anonimi
Inglese
Internazionale
ELETTRONICO
773
300
306
7
By adopting a generalised parton model approach at leading order in QCD, including spin and intrinsic parton motion effects, we study the Collins azimuthal asymmetries for pions within a large-pT jet produced at mid-rapidity in polarised hadronic collisions. Using available information on the quark transversity distributions and the pion Collins functions, as extracted from semi-inclusive deeply inelastic scattering and e e --> h1 h2 X processes, we compute estimates for the Collins asymmetries in kinematical configurations presently investigated at RHIC by the STAR Collaboration. Collins-like asymmetries, involving linearly polarised gluons, are also considered. Our predictions, compared against available preliminary data, show a very good agreement, even if some discrepancies, to be further scrutinized both theoretically and experimentally, appear in the transverse momentum dependence of the Collins asymmetry. These results are in favour of the predicted universality of the Collins function and of a mild, if any, evolution with the hard scale of the asymmetries.
Polarization effects; QCD phenomenology; Transverse momentum dependent distributions; Universality; Nuclear and High Energy Physics
http://www.sciencedirect.com/science/journal/03702693
no
3
info:eu-repo/semantics/article
262
D'Alesio, Umberto; Murgia, Francesco; Pisano, Cristian
1 Contributo su Rivista::1.1 Articolo in rivista
none
1.1 Articolo in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1199686
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