Speaker
Description
Double spin asymmetries for particle and jet productions in longitudinally polarized proton-proton collisions are among the key measurements at RHIC to extract the spin fraction of gluons inside the proton. Although next-to-leading order perturbative QCD predictions have been quite successful in fitting experimental data within the RHIC kinematics, to constrain gluons at even smaller x, one needs theoretical predictions including the small x evolution and gluon saturation effect. In this talk, I will present our efforts towards completing this task. To be specific, we have calculated the longitudinal double spin asymmetry for soft gluon production at midrapidity in the small x regime. Our result is expressed in terms of polarized Wilson lines and is related to quark and gluon helicity distribution of the proton at small x. The result can also provide valuable information on phenomenology related to small x helicity evolution.
| Submitted on behalf of a Collaboration? | No |
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| Participate in poster competition? | No |
