Volume 456 - 25th International Symposium on Spin Physics (SPIN2023) - 3D Structure of the Nucleon: TMDs
Transverse Spin Dependent Azimuthal Correlations of Charged Pion Pairs in pp collisions at s=510 GeV at STAR
N. Ghimire
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Published on: July 30, 2024
Abstract
The transverse polarization of quarks within a transversely polarized nucleon, hq1(x), can only be accessed through processes involving its coupling with another chiral-odd functions, such as the spin-dependent interference fragmentation function (IFF) in polarized proton-proton collisions. The coupling of hq1(x) and IFF leads to a measurable azimuthal correlation asymmetry (Asin(ϕRS)UT) of di-hadron pairs in the final state. In previous work, the STAR experiment at RHIC measured a non-zero Asin(ϕRS)UT using polarized proton-proton (pp) data from 2011 at s=500 GeV, with an integrated luminosity of 25 pb1. The precise measurement of Asin(ϕRS)UT together with unpolarized di-hadron cross section will help to constrain the hq1(x) in the global fits. In 2017, the STAR experiment collected dataset of approximately 350 pb1 from pp collisions at s=510 GeV. This new dataset will significantly improve the statistical precision of the Asin(ϕRS)UT measurement. In this proceedings, we will present preliminary result of the measurement of Asin(ϕRS)UT for pion pairs in the pseudorapidity region |η|<1 based on the STAR 2017 pp dataset.
DOI: https://doi.org/10.22323/1.456.0063
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