Speaker
Milap Patel
(Iowa State University)
Description
The longitudinal double-spin asymmetry (ALL) is spin-polarized p+p collisions provides insight into the gluon contribution to the proton’s spin by accessing the gluon helicity distribution ∆g. The PHENIX π0 and STAR jet ALL measurement show a non-zero asymmetries and hence indicate a nonzero ∆g in an NLO analysis. The STAR measurements of jet A LL in √s = 200 and 510 GeV polarized p+p collisions provide the strongest constraints on ∆g at intermediate to high x. Using new jet reconstruction techniques developed for the PHENIX detector, a measurement of the jet ALL at √s = 510 GeV in PHENIX will provide an important cross check on the results from STAR. In this poster I will highlight the progress of this analysis effort in PHENIX.
