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

Journal Article · Tue Jul 12 00:00:00 EDT 2022 · SciPost Physics Proceedings

DOI:https://doi.org/10.21468/SciPostPhysProc.8.047· OSTI ID:1875729

Pokhrel, Babu ^[1]

---

1. Temple University

At the leading twist, the transversity distribution function, h^{q}_{1}(x) $h_1^q\left(x\right)$ , where x $x$ is the longitudinal momentum fraction of the proton carried by quark q $q$ , 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 $p^{\uparrow }p$ ), h_{1}^{q}(x) $h_1^q\left(x\right)$ 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) $h_1^q\left(x\right)$ . We report the measurement of correlation asymmetries for charged pion(s) in p^\uparrow p $p^{\uparrow }p$ , through the Collins and the Interference FF channel.

• Sponsoring Organization: USDOE
• OSTI ID: 1875729
• Journal Information: SciPost Physics Proceedings, Journal Name: SciPost Physics Proceedings Journal Issue: 8; ISSN 2666-4003
• Publisher: Stichting SciPost
• Country of Publication: Netherlands
• Language: English