Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-10-08
J.Phys.G36:015007,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
RevTeX, 9 pages, 3 eps figures. Revised and shortened version; title slightly modified; figs. 3,4 removed; a new figure for th
Scientific paper
10.1088/0954-3899/36/1/015007
The longitudinal double spin asymmetry A_LL in the reaction pp --> pi X has been measured at RHIC with extremely interesting consequences. If the gluon polarization in a proton were as big as needed to resolve the famous "spin crisis" then A_LL would be large and positive. Latest RHIC results indicate that A_LL is small and disfavour large positive values of the gluon polarization. We examine whether the soft mechanisms (Collins, Sivers, Boer-Mulders), essential for generating transverse single spin asymmetries, have any significant influence on A_LL, and whether they could alter the conclusion that the gluon polarization is necessarily small. It turns out that the contribution from these effects is essentially negligible.
Anselmino Mauro
Boglione Maria
D'Alesio Umberto
Leader Elliot
Melis Stefano
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