Abstract
The transversity distribution, which describes transversely polarized quarks in a transversely polarized nucleon, is a fundamental component of the current picture 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[Formula: see text]+p collisions. Significant di-hadron correlations have recently been measured at RHIC in p[Formula: see text]+p collisions at [Formula: see text] = 200 GeV at mid-rapidity. In 2011, STAR collected p[Formula: see text]+p data at [Formula: see text] = 500 GeV, allowing STAR to extend these di-hadron asymmetries into a previously unexplored kinematic region. The status of the charge-ordered pion pair asymmetry measurement from [Formula: see text] = 500 GeV p[Formula: see text]+p collisions will be presented.
Highlights
Transversity, hq1(x), describes transversely polarized quarks, q, with fractional momentum, x, been studied in in a transversely polarized polarized p + p collisions at √nucleon.[1] sNN =Transversity has previously 200 GeV2 and semi-inclusive deep inelastic scattering(SIDIS) measurements3–.7 Azimuthal di-hadron correlation asymmetries are proportional to the product of transversity and the interference fragmentation function(IFF), and allow for point-to-point extraction of transversity in SIDIS
The IFF is independent of the intrinsic transverse momentum from the hadronization process,[8, 9] allowing for the universality of the IFF between p + p and SIDIS to be tested
High precision data is lacking at relatively high x, which can be seen in Ref. 10
Summary
Transversity, hq1(x), describes transversely polarized quarks, q, with fractional momentum, x, been studied in in a transversely polarized polarized p + p collisions at √nucleon.[1] sNN =Transversity has previously 200 GeV2 and semi-inclusive deep inelastic scattering(SIDIS) measurements3–.7 Azimuthal di-hadron correlation asymmetries are proportional to the product of transversity and the interference fragmentation function(IFF), and allow for point-to-point extraction of transversity in SIDIS. The transverse momentum, pT , of each particle is ≥ 1.5 GeV/c and the sum of pT for each pair, pπT+π− , is ≥ 3.75 GeV/c. 3. Analysis The azimuthal angles in the scattering system used to calculate the π+π− correlation asymmetry are shown−→in Fig. 1, where the scattering plane is defined by the polari−→zed beam direction, P B, and the direction of the total momentum of the pion pair, P C .
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