Speaker
Description
The transversity distribution is a fundamental component of the spin structure of the nucleon, and is only loosely constrained by existing semi-inclusive deep inelastic scattering data. The di hadron interference fragmentation function (IFF), which describes the fragmentation of transversely polarized quarks, is expected to give rise to spin-dependent di-hadron correlations in p↑+p collisions. Significant asymmetries in di-hadron correlations have already been measured at RHIC in p↑+p collisions at √s = 200 GeV at mid-rapidity. In 2011, STAR collected an integrated luminosity of 25 pb−1 from p↑+p collisions at √s = 500 GeV, allowing STAR to extend these di hadron asymmetries into a previously unexplored kinematic region. The charge-ordered pion pair asymmetry measurement from √s = 500 GeV p↑+p collisions at STAR is presented as a function pion pair transverse momentum, invariant mass, and pseudorapidity.
