Comparison of transverse single-spin asymmetries for forward π0 production in polarized pp, pAl and pAu collisions at nucleon pair c.m. energy sNN =200 GeV

Jaroslav Adam,Leszek Adamczyk,J. R. Adams,J. K. Adkins,G. Agakishiev,Madan M. Aggarwal,Zubayer Ahammed,I. G. Alekseev,Donald M. Anderson,A. Aparin,E. C. Aschenauer,Muhammad Usman Ashraf,F. G. Atetalla,A. Attri,G. S. Averichev,Vipul Bairathi,K. N. Barish,Arabinda Behera,Rene Bellwied,Anju Bhasin,Jaroslav Bielcik,Jana Bielcikova,L. C. Bland,I. G. Bordyuzhin,J. D. Brandenburg,A. V. Brandin,J. M. Butterworth, H. Caines,M. Calderon De La Barca Sanchez,D. Cebra,Irakli Chakaberia,P. Chaloupka,B. K. Chan,F-H. Chang,Z. Chang,N. Chankova-Bunzarova,Avishek Chatterjee,D. Chen,J. H. Chen,Jing-Han Chen, X. C. Chen,Zhenyu Chen,J. Cheng,M. Cherney,M. Chevalier,Somnath Choudhury,W. Christie,X. Chu,H. J. Crawford,M. Csanad,M. S. Daugherity,T. G. Dedovich,I. M. Deppner,A. A. Derevschikov,L. Didenko,C. Dilks,X. Dong,J. L. Drachenberg,J. C. Dunlop,T. Edmonds,N. Elsey,J. Engelage,G. Eppley,S. Esumi,Olga Evdokimov,A. Ewigleben,O. Eyser,R. Fatemi,S. Fazio,P. Federic,J. Fedorisin,C. J. Feng,Yicheng Feng,P. Filip,E. Finch,Y. Fisyak,Audrey Francisco,L. Fulek,C. A. Gagliardi,T. Galatyuk,Frank Jm Geurts,A. Gibson,K. Gopal,X. Gou,D. Grosnick,W. Guryn,A. I. Hamad,A. Hamed,S. Harabasz,J. W. Harris,S. He,W. He,X. H. He,Y. He,S. Heppelmann,N. Herrmann,E. Hoffman,Lukas Holub,Y. Hong,S. Horvat

Physical Review D（2021）

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摘要

Author(s): Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM; Aparin, A; Aschenauer, EC; Ashraf, MU; Atetalla, FG; Attri, A; Averichev, GS; Bairathi, V; Barish, K; Behera, A; Bellwied, R; Bhasin, A; Bielcik, J; Bielcikova, J; Bland, LC; Bordyuzhin, IG; Brandenburg, JD; Brandin, AV; Butterworth, J; Caines, H; Calderon De La Barca Sanchez, M; Cebra, D; Chakaberia, I; Chaloupka, P; Chan, BK; Chang, FH; Chang, Z; Chankova-Bunzarova, N; Chatterjee, A; Chen, D; Chen, J; Chen, JH; Chen, X; Chen, Z; Cheng, J; Cherney, M; Chevalier, M; Choudhury, S; Christie, W; Chu, X; Crawford, HJ; Csanad, M; Daugherity, M; Dedovich, TG; Deppner, IM; Derevschikov, AA; Didenko, L; Dilks, C; Dong, X; Drachenberg, JL; Dunlop, JC; Edmonds, T; Elsey, N; Engelage, J; Eppley, G; Esumi, S; Evdokimov, O; Ewigleben, A; Eyser, O; Fatemi, R; Fazio, S; Federic, P; Fedorisin, J; Feng, CJ; Feng, Y; Filip, P; Finch, E; Fisyak, Y; Francisco, A; Fulek, L; Gagliardi, CA; Galatyuk, T; Geurts, F; Gibson, A; Gopal, K; Gou, X; Grosnick, D | Abstract: The STAR collaboration reports a measurement of the transverse single-spin asymmetries, AN, for neutral pions produced in polarized proton collisions with protons (pp), with aluminum nuclei (pAl) and with gold nuclei (pAu) at a nucleon-nucleon center-of-mass energy of 200 GeV. Neutral pions are observed in the forward direction relative to the transversely polarized proton beam, in the pseudorapidity region 2.7lηl3.8. Results are presented for π0s observed in the STAR forward meson spectrometer electromagnetic calorimeter in narrow Feynman x (xF) and transverse momentum (pT) bins, spanning the range 0.172.5 GeV/c. It is further observed that the value of AN is significantly larger for events with a large-pT isolated π0 than for events with a nonisolated π0 accompanied by additional jetlike fragments. The nuclear dependence r(A) is similar for isolated and nonisolated π0 events.

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