Measurement of the Transverse Single-Spin Asymmetry in p^{↑}+p→W^{±}/Z^{0} at RHIC.

L Adamczyk,G Webb,R Pak,N Yu,K Kauder,A Quintero,Y Guo,A Bhasin,J Porter,B Stringfellow,Y Zoulkarneeva,M Stepanov,Y Zhang,J Zhang,A Manion,P Sorensen,G Agakishiev,W Guryn,D Smirnov,S Singha,S Margetis,D Garand,A Banerjee,G Igo,P Pile,A Vossen,S Fazio,X Xie,G Wang,W Xie,D Mcdonald,P Huck,H Wieman,S Zhang,A Hamed,G Eppley,R Witt,A Lebedev,H Zbroszczyk,A Roy,L Didenko,P Tribedy,P Seyboth,A Tawfik,O Eyser,C Li,C Perkins,T Todoroki,J Jia,J Putschke,W Zha,D Kalinkin,L Greiner,Z Zhang,R Majka,S Kabana,J Sandweiss,O Evdokimov,T Niida,T Tarnowsky,J Lauret,B Srivastava,D Grosnick,M Shao,D Tlusty,H Caines,F Wang,K Poniatowska,J Thäder,I Kisel,L Wen,Y Pandit,F Liu,Y Wu,S Raniwala,S Mioduszewski,S Trentalange,Q Yang,K Jiang,S Horvat,K Yip,L Ma,R Ma,A Gupta,A Attri,G Van Nieuwenhuizen,S Gupta,C Markert,I Upsal,F Videbæk,B Sharma,A Kechechyan,N Shah,B Huang,M Calderón De La Barca Sánchez,A Ogawa,J Seger,N Magdy,L Ruan,P Federic,X Luo,Y Li,M Vandenbroucke,R Raniwala,R Haque,M Simko,L Song,Z Shi,P Chaloupka,B Pawlik,J Zhao,D Arkhipkin,S Chattopadhyay,G Contin,W Solyst,Z Tang,M Strikhanov,X Chen,Z Xu,B Summa,M Lomnitz,A Kisiel,L Yi,H Wang,N Smirnov,L He,I Alekseev,R Bellwied,S Yang,L Kumar,X Zhu,I Chakaberia,I Bunzarov,L Kochenda,P Filip,J Butterworth,G Odyniec,B Surrow,Y Fisyak,K Xin,E Shahaliev,G Van Buren,A Aparin,S Heppelmann,Md Nasim,R Stock,J Pluta,J Cheng,H Pei,J Bouchet,X Dong,R Sikora,H Xu,V Bairathi,M Cherney,R Varma,P Bhattarai,W Christie,K Oh,A Jentsch,A Sarkar,Z Chang,M Tokarev,H Qiu,S Das,T Lin,X Huang,O Rusnakova,Z Ye,S Ramachandran,P Yepes,X Li,K Meehan,B Di Ruzza,C Dilks,Y Wang,M Zyzak,W Li,Z Feng,Y Panebratsev,J Deng,G Nigmatkulov,R Fatemi,N Xu,B Mohanty,D Mishra,D Cebra,A Gibson,K Kang,A Hirsch,J Engelage,D Keane,D Olvitt,K Krueger,S Salur,T Ullrich,N Schmitz,Z Ahammed,I Sakrejda,C Yang,M Posik,R Esha,J L Drachenberg ,J M Campbell ,R Lednický ,T G Dedovich ,L V Nogach ,A V Brandin ,S Y Noh ,E G Judd ,Ł Fulek ,P K Sahu ,J Rusňák ,M J Skoby ,D D Koetke ,H.g Ritter ,S Vokál ,J D Brandenburg ,S B Nurushev ,M M Aggarwal ,Yi Yang ,Д А Морозов ,L C Bland ,R P Scharenberg ,R L Ray ,G L ,S A Voloshin ,T J Humanic ,J W Harris ,R Vértesi ,S S Shi ,A K Bhati ,X M Sun ,J Bielčíková ,E P Sichtermann ,K D Landry ,J L Romero ,M Sharma ,J K Adkins ,Johann Joachim Schambach ,C Flores ,T D S Stanislaus ,Xiao Zhang ,W Q Shen ,N Sahoo ,H J Jang ,J Roberts ,R Debbe ,B K Nandi ,Q H Xu ,H W Ke ,M A.c Lamont ,Xiaozhi Bai ,G S Averichev ,J Fedorišin ,S W Wissink ,H M Spinka ,F J M Geurts ,B S Page ,A H Tang ,W B Schmidke ,J H Lee ,D S Gunarathne ,A M Poskanzer ,H J Crawford ,J E Draper ,R S Longacre ,D G Underwood ,J Novák ,A Vasiliev ,V Okorokov ,A F Kraishan ,C A Gagliardi ,L E Dunkelberger ,T K Nayak ,I K Yoo ,D N Svirida ,R E Tribble ,J M Landgraf ,J Bielčík ,D J Hofman ,П Кравцов ,D P Kikoła ,J S Wang ,Y Xu ,Tao Huang ,A R Timmins ,Q Shou ,Z H Khan ,A I Hamad ,L K Kosarzewski ,Y X Pan ,Jun Xu ,M A Lisa ,J C Webb ,J H Thomas ,J B Zhang ,J C Dunlop ,C M Du ,Y G ,S K Tripathy ,J H Chen ,O V Rogachevskiy ,O D Tsai ,Zhi‐Wei Sun ,G W Hoffmann ,W W Jacobs ,L C De Silva ,G D Westfall ,N G Minaev ,A A Derevschikov ,A Schmah ,H Z Huang ,J C Mei ,E C Aschenauer ,Martin Girard ,M M Mondal ,W J Llope ,I G Bordyuzhin ,M K Mustafa ,T Ljubičić ,M Šumbera ,N K Pruthi ,L G Efimov ,P V Shanmuganathan ,Y K Sun ,Zhong Chen ,X P Zhang ,Long Zhou

doi:10.1103/physrevlett.116.132301

Abstract

We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at sqrt[s]=500 GeV by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse-momentum-dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the nonuniversality of the Sivers function, fundamental to our understanding of QCD.

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