Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p↑ + p collisions at s=500 GeV
2018
Abstract The
transversitydistribution, which describes
transverselypolarized quarks in
transverselypolarized nucleons, is a fundamental component of the
spin structureof the nucleon, and is only loosely constrained by global fits to existing semi-inclusive
deep inelastic scattering(SIDIS) data. In
transverselypolarized p ↑ + p collisions it can be accessed using
transversepolarization dependent
fragmentation functionswhich give rise to azimuthal correlations between the polarization of the struck parton and the final state
scalar mesons. This letter reports on spin dependent di-hadron correlations measured by the STAR experiment. The new dataset corresponds to 25 pb −1 integrated luminosity of p ↑ + p collisions at s = 500 GeV, an increase of more than a factor of ten compared to our previous measurement at s = 200 GeV. Non-zero asymmetries sensitive to
transversityare observed at a Q 2 of several hundred GeV and are found to be consistent with the former measurement and a model calculation. We expect that these data will enable an extraction of
transversitywith comparable precision to current SIDIS datasets but at much higher momentum transfers where subleading effects are suppressed.
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