Speaker
Description
Understanding the origin of transverse single-spin asymmetries is a long-standing challenge in strong interaction physics. Significant progresses have been made in the last few decades from both the experimental and theoretical sides, which fueled the rapid development of twist-3 and transverse-momentum-dependent (TMD) factorization schemes. Measurement of the azimuthal distribution of identified hadrons produced during the fragmentation of a large transverse momentum jet offers a unique opportunity to study the TMD physics in hadronic collisions, such as the Collins effect which involves the correlation of the quark transversity and the Collins fragmentation functions. In 2012 and 2015, STAR collected $\sim$22 $\mathrm{pb^{-1}}$ and $\sim$52 $\mathrm{pb^{-1}}$ of transversely polarized $pp$ data at $\sqrt{s}$ = 200 GeV, respectively. These datasets enable the most precise measurement of the transverse single-spin asymmetries in 200 GeV $pp$ collisions to date. Results of the asymmetries for inclusive jets and identified pions, kaons, and protons in jets using these datasets will be presented.
| Submitted on behalf of a Collaboration? | Yes |
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