Azimuthal transverse single-spin asymmetries of inclusive jets and identified hadrons within jets from polarized pp collisions at s=200 GeV

Résumé fourni par la source

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 $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$, 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 $\ensuremath{\eta}$, 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 $\ensuremath{\sim}900\text{ }\text{ }{\mathrm{GeV}}^{2}$) 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.

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