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arXiv · 2205.11800

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

STAR Collaboration·M. S. Abdallah·B. E. Aboona·J. Adam·L. Adamczyk·J. R. Adams·J. K. Adkins·I. Aggarwal·M. M. Aggarwal·Z. Ahammed·D. M. Anderson·E. C. Aschenauer·M. U. Ashraf·J. Atchison·V. Bairathi·W. Baker·J. G. Ball Cap·K. Barish·A. Behera·R. Bellwied·P. Bhagat·A. Bhasin·J. Bielcik·J. Bielcikova·J. D. Brandenburg·X. Z. Cai·H. Caines·M. Calderón de la Barca Sánchez·D. Cebra·I. Chakaberia·P. Chaloupka·B. K. Chan·Z. Chang·A. Chatterjee·S. Chattopadhyay·D. Chen·J. Chen·J. H. Chen·X. Chen·Z. Chen·J. Cheng·S. Choudhury·W. Christie·X. Chu·H. J. Crawford·M. Csanád·M. Daugherity·I. M. Deppner·A. Dhamija·L. Di Carlo·L. Didenko·P. Dixit·X. Dong·J. L. Drachenberg·E. Duckworth·J. C. Dunlop·J. Engelage·G. Eppley·S. Esumi·O. Evdokimov·A. Ewigleben·O. Eyser·R. Fatemi·F. M. Fawzi·S. Fazio·C. J. Feng·Y. Feng·E. Finch·Y. Fisyak·A. Francisco·C. Fu·C. A. Gagliardi·T. Galatyuk·F. Geurts·N. Ghimire·A. Gibson·K. Gopal·X. Gou·D. Grosnick·A. Gupta·W. Guryn·A. Hamed·Y. Han·S. Harabasz·M. D. Harasty·J. W. Harris·H. Harrison·S. He·W. He·X. H. He·Y. He·S. Heppelmann·N. Herrmann·E. Hoffman·L. Holub·C. Hu·Q. Hu·Y. Hu·H. Huang·H. Z. Huang
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Abstract

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 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 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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STAR Collaboration, M. S. Abdallah, B. E. Aboona, J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins, I. Aggarwal, M. M. Aggarwal, Z. Ahammed, D. M. Anderson, E. C. Aschenauer, M. U. Ashraf, J. Atchison, V. Bairathi, W. Baker, J. G. Ball Cap, K. Barish, A. Behera, R. Bellwied, P. Bhagat, A. Bhasin, J. Bielcik, J. Bielcikova, J. D. Brandenburg, X. Z. Cai, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, I. Chakaberia, P. Chaloupka, B. K. Chan, Z. Chang, A. Chatterjee, S. Chattopadhyay, D. Chen, J. Chen, J. H. Chen, X. Chen, Z. Chen, J. Cheng, S. Choudhury, W. Christie, X. Chu, H. J. Crawford, M. Csanád, M. Daugherity, I. M. Deppner, A. Dhamija, L. Di Carlo, L. Didenko, P. Dixit, X. Dong, J. L. Drachenberg, E. Duckworth, J. C. Dunlop, J. Engelage, G. Eppley, S. Esumi, O. Evdokimov, A. Ewigleben, O. Eyser, R. Fatemi, F. M. Fawzi, S. Fazio, C. J. Feng, Y. Feng, E. Finch, Y. Fisyak, A. Francisco, C. Fu, C. A. Gagliardi, T. Galatyuk, F. Geurts, N. Ghimire, A. Gibson, K. Gopal, X. Gou, D. Grosnick, A. Gupta, W. Guryn, A. Hamed, Y. Han, S. Harabasz, M. D. Harasty, J. W. Harris, H. Harrison, S. He, W. He, X. H. He, Y. He, S. Heppelmann, N. Herrmann, E. Hoffman, L. Holub, C. Hu, Q. Hu, Y. Hu, H. Huang, H. Z. Huang. 2022-05-24. Azimuthal transverse single-spin asymmetries of inclusive jets and identified hadrons within jets from polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV. https://doi.org/10.1103/physrevd.106.072010

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