Title: Transverse Single-Spin Asymmetry for Diffractive Electromagnetic Jets at FMS in p+p Collisions at \sqrt{s}  = 510 GeV at STAR

 PA: Xilin Liang, Kenneth Barish (supervisor)

 PA email address: xilin.liang@email.ucr.edu

  Abstract: There have been numerous attempts, both theoretical and experimental, to understand the origin of the unexpectedly large transverse single spin asymmetry ($A_{N}$) for the inclusive hadron production at forward rapidities observed in p^{\uparrow} + p collisions at various center-of-mass energies. The twist-3 contributions in the collinear factorization framework and the transverse-momentum-dependent contributions from the initial-state quark and gluon Sivers functions and/or final-state Collins fragmentation functions are potential explanations to this puzzle. Previous analyses of $A_{N}$ for forward \pi^{0} and electromagnetic jets in p^{\uparrow} + p collisions at STAR indicated that there might be non-trivial contributions to the large $A_{N}$ from diffractive processes.