The STAR Collaboration reports measurements of the transverse single-spin asymmetries, $A_N$, for inclusive jets and identified “hadrons within jets” production at midrapidity from transversely polarized $pp$ collisions at $\sqrt{s}=200\mathrm{GeV}$, based on data recorded in 2012 and 2015. The inclusive jet asymmetry measurements include $A_N$ for inclusive jets and $A_N$ for jets containing a charged pion carrying a momentum fraction $z>0.3$ of the jet momentum. The identified hadron within jet asymmetry measurements include the Collins effect for charged pions, kaons, and protons, and the Collins-like effect for charged pions. The measured asymmetries are determined for several distinct kinematic regions characterized by the jet transverse momentum $p_T$ and pseudorapidity $\eta$, as well as the hadron momentum fraction $z$ and momentum transverse to the jet axis $j_T$. These results probe higher momentum scales ($Q^2$ up to $\sim 900{\mathrm{GeV}}^2$) than current, semi-inclusive deep-inelastic scattering measurements, and they provide new constraints on quark transversity in the proton and enable tests of evolution, universality, and factorization breaking in the transverse-momentum-dependent formalism.

• Received 18 May 2022
• Accepted 12 September 2022

DOI:https://doi.org/10.1103/PhysRevD.106.072010

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Published by the American Physical Society