Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p ↑ +p collisions at

L. Adamczyk,J. Adams,J. K. Adkins,G. Agakishiev,M. M. Aggarwal,Z. Ahammed,N. N. Ajitanand,I Alekseev,D. M. Anderson,R. Aoyama,A. Aparin,D. Arkhipkin,E. C. Aschenauer,M. U. Ashraf,A. Attri,G. S. Averichev,V. Bairathi,K. N. Barish,Arabinda Behera,R. Bellwied,A. Bhasin,A. K. Bhati,P. Bhattarai,J. Bielcik,J. Bielcikova,L. C. Bland,I. Bordyuzhin,J. Bouchet,J. D. Brandenburg,A. V. Brandin,D. D. Brown,J. Bryslawskyj,I. Bunzarov,J. M. Butterworth,H. Caines,M. Calderon De La Barca Sanchez,John Campbell,D. Cebra,I. Chakaberia,P. Chaloupka,Z. Chang,N. Chankova-Bunzarova,A. Chatterjee,S. Chattopadhyay,J. H. Chen,X. Chen,J. Cheng,M. Cherney,W. Christie,G. Contin,H. J. Crawford,T. G. Dedovich,J. Deng,I. M. Deppner,A. A. Derevschikov,L. Didenko,C. Dilks,X. Dong,J. L. Drachenberg,J. E. Draper,J. C. Dunlop,L. G. Efimov,N. Elsey,J. Engelage,G. Eppley,R. Esha,S. Esumi,O. Evdokimov,J. Ewigleben,O. Eyser,R. Fatemi,S. Fazio,P. Federic,P. Federicova,J. Fedorisin,Z. Feng,P. Filip,E. Finch,Y. Fisyak,C. Flores,J. Fujita,L. Fulek,C. A. Gagliardi,Frank Jm Geurts,A. Gibson,M. Girard,D. Grosnick,D. S. Gunarathne,Y. Guo,A. Gupta,W. Guryn,A. I. Hamad,A. Hamed,A. Harlenderova,J. W. Harris,L. He,S. Heppelmann,N. Herrmann,A. Hirsch,S. Horvat,X. Huang,H. Z. Huang,T. Huang,B. Huang,T. J. Humanic,Peng Huo,G. Igo,W. W. Jacobs,A. Jentsch,J. Jia,K. Jiang,S. Jowzaee,E. G. Judd,S. Kabana,D. Kalinkin,K. Kang,D. Kapukchyan,K. Kauder,H. W. Ke,D. Keane,A. Kechechyan,Z. H. Khan,D. P. Kikola,C. Kim,I. Kisel,A. Kisiel,L. Kochenda,M. Kocmanek,T. Kollegger,L. K. Kosarzewski,A. F. Kraishan,L. Krauth,P. Kravtsov,K. Krueger,N. Kulathunga,L. Kumar,J. Kvapil,J. H. Kwasizur,R. Lacey,J. M. Landgraf,K. D. Landry,J. Lauret,A. Lebedev,R. Lednický,J. H. Lee,W. D. Li,C. Li,X. Li,Y. Li,J. Lidrych,T. Lin,M. A. Lisa,Y. Liu,H. Liu,F. Liu,P. Liu,T. Ljubicic,W. J. Llope,M. Lomnitz,R. S. Longacre,X. Luo,S. Luo,L. Ma,Y. G. Ma,G. L. Ma,R. Ma,N. Magdy,R. Majka,D. Mallick,S. Margetis,C. Markert,H. S. Matis,D. Mayes,K. Meehan,J. C. Mei,Z. W. Miller,N. G. Minaev,S. Mioduszewski,D. Mishra,S. Mizuno,B. Mohanty,M. M. Mondal,D. A. Morozov,M. K. Mustafa,Md. Nasim,T. K. Nayak,J. M. Nelson,D. B. Nemes,M. Nie,G. Nigmatkulov,T. Niida,L. V. Nogach,T. Nonaka,S. B. Nurushev,G. Odyniec,A. Ogawa,K. Oh,V. Okorokov,D. Olvitt,B. S. Page,R. Pak,Y. Pandit,Y. Panebratsev,B. Pawlik,H. Pei,C. Perkins,J. Pluta,K. Poniatowska,J. Porter,M. Posik,N. K. Pruthi,M. Przybycien,J. Putschke,A. Quintero,R. L. Ray,R. G. Reed,M.J. Rehbein,H. G. Ritter,Jay Roberts,O. V. Rogachevskiy,J. L. Romero,Jordan Daniel Roth,L. Ruan,J. Rusnak,O. Rusnakova,Niladribihari Sahoo,P. K. Sahu,S. Salur,J. Sandweiss,M. Saur,J. Schambach,A. M. Schmah,W. B. Schmidke,N. Schmitz,B. R. Schweid,J. Seger,M. Sergeeva,R. Seto,P. Seyboth,N. Shah,E. Shahaliev,P. V. Shanmuganathan,M. Shao,W.Q. Shen,S. S. Shi,Z. Shi,Q. Y. Shou,E. P. Sichtermann,R. Sikora,M. Simko,S. Singha,M. J. Skoby,N Smirnov,D. Smirnov,W. Solyst,P. Sorensen,H. M. Spinka,B. Srivastava,T. D. S. Stanislaus,D. J. Stewart,M. Strikhanov,B. Stringfellow,A. A. P. Suaide,T. Sugiura,M. Sumbera,B. Summa,X. M. Sun,X. M. Sun,Y. J. Sun,B. Surrow,D. N. Svirida,Z. Tang,A. H. Tang,A. Taranenko,T. Tarnowsky,A. Tawfik,J. Thäder,J. H. Thomas,A. R. Timmins,D. Tlusty,T. Todoroki,M. Tokarev,S. Trentalange,R. E. Tribble,P. Tribedy,S. K. Tripathy,B. A. Trzeciak,O. D. Tsai,B. Tu,T. Ullrich,D. G. Underwood,I. Upsal,G. Van Buren,G. van Nieuwenhuizen,A. N. Vasiliev,F. Videbaek,S. Vokal,S. A. Voloshin,A. Vossen,G. Wang,Y. Wang,F. Wang,G. Webb,J. C. Webb,L. Wen,G. D. Westfall,H. Wieman,S. W. Wissink,R. Witt,Y. Wu,Z. Xiao,G. Xie,W. Xie,N. Xu,Y. Xu,Q. H. Xu,Z. Xu,Y. Yang,C. Yang,S. Yang,Q. Yang,Z. Ye,L. Yi,K. Yip,I. K. Yoo,H. Zbroszczyk,W. Zha,J. B. Zhang,J. Zhang,S. Zhang,Z. P. Zhang,Y. Zhang,L. Zhang,X. P. Zhang,J. Zhao,C. Zhong,C. Zhou,L. Zhou,X. Zhu,Z. Zhu,M. Zyzak

Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p ↑ +p collisions at

2018

Abstract The transversitydistribution, which describes transverselypolarized quarks in transverselypolarized nucleons, is a fundamental component of the spin structureof the nucleon, and is only loosely constrained by global fits to existing semi-inclusive deep inelastic scattering(SIDIS) data. In transverselypolarized p ↑ + p collisions it can be accessed using transversepolarization dependent fragmentation functionswhich give rise to azimuthal correlations between the polarization of the struck parton and the final state scalar mesons. This letter reports on spin dependent di-hadron correlations measured by the STAR experiment. The new dataset corresponds to 25 pb −1 integrated luminosity of p ↑ + p collisions at s = 500 GeV, an increase of more than a factor of ten compared to our previous measurement at s = 200 GeV. Non-zero asymmetries sensitive to transversityare observed at a Q 2 of several hundred GeV and are found to be consistent with the former measurement and a model calculation. We expect that these data will enable an extraction of transversitywith comparable precision to current SIDIS datasets but at much higher momentum transfers where subleading effects are suppressed.

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