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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 (Aₔₓ^ ({ₑₒ) }) of di-hadron pairs in the final state. In previous work, the STAR experiment at RHIC measured a non-zero Aₔₓ^ ({ₑₒ) } using polarized proton-proton (p^ p) data from 2011 at s = 500 GeV, with an integrated luminosity of 25 pb^-1. The precise measurement of Aₔₓ^ ({ₑₒ) } 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 pb^-1 from p^ p collisions at s = 510 GeV. This new dataset will significantly improve the statistical precision of the Aₔₓ^ ({ₑₒ) } measurement. In this proceedings, we will present preliminary result of the measurement of Aₔₓ^ ({ₑₒ) } for pion pairs in the pseudorapidity region ||<1 based on the STAR 2017 p^ p dataset.
Navagyan Ghimire (Tue,) studied this question.