PoS - Proceedings of Science
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 $p^{\uparrow}p$ collisions at $\sqrt{s} = 510$ 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, $h^q_1(x)$, 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 $h^q_1(x)$ and IFF leads to a measurable azimuthal correlation asymmetry ($A_{{UT}}^{\sin(\phi_{{RS}})}$) of di-hadron pairs in the final state. In previous work, the STAR experiment at RHIC measured a non-zero $A_{{UT}}^{\sin(\phi_{{RS}})}$ using polarized proton-proton ($p^\uparrow p$) data from 2011 at $\sqrt s = 500$ GeV, with an integrated luminosity of 25 pb$^{-1}$. The precise measurement of $A_{{UT}}^{\sin(\phi_{{RS}})}$ together with unpolarized di-hadron cross section will help to constrain the $h^q_1(x)$ in the global fits. In 2017, the STAR experiment collected dataset of approximately 350 pb$^{-1}$ from $p^\uparrow p$ collisions at $\sqrt s = 510$ GeV. This new dataset will significantly improve the statistical precision of the $A_{{UT}}^{\sin(\phi_{{RS}})}$ measurement. In this proceedings, we will present preliminary result of the measurement of $A_{{UT}}^{\sin(\phi_{{RS}})}$ for pion pairs in the pseudorapidity region $|\eta|<1$ based on the STAR 2017 $p^\uparrow p$ dataset.
DOI: https://doi.org/10.22323/1.456.0063
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