Measurement of Transverse Spin Dependent Azimuthal Correlations of Charged Pion(s) in $p^{\uparrow }p$ Collisions at $\sqrt{s}=200$ GeV at STAR

Abstract

At the leading twist, the transversity distribution function, $h_1^q(x)$, where $x$ is the longitudinal momentum fraction of the proton carried by quark $q$, encodes the transverse spin structure of the nucleon. Extraction of it is difficult because of its chiral-odd nature. In transversely polarized proton-proton collisions ($p^{\uparrow }p$), $h_1^q(x)$ can be coupled with another chiral-odd partner, a spin-dependent fragmentation function (FF). The resulting asymmetries in hadron(s) azimuthal correlations directly probe $h_1^q(x)$. We report the measurement of correlation asymmetries for charged pion(s) in $p^{\uparrow }p$, through the Collins and the Interference FF channel.

6 pages, 3 figures, Submission to SciPost Proceedings-DIS2021

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Testing the universality of the Collins function in pion-jet production at RHIC

Cited by in corpus (1)

• Analogies between hadron-in-jet and dihadron fragmentation