Forward Neutral-Pion Transverse Single-Spin Asymmetries inp+pCollisions ats=200  GeV

B I Abelev,M Estienne,S Lapointe,J Tatarowicz,Y Li,V Fine,C Roy,R L Ray,Y Fisyak,N Van Der Kolk,D J Hofman,O Catu,E Finch,M M Aggarwal,G Wang,M C Suarez,R Stock,E Shahaliev,G Lin,I A Qattan,B Stringfellow,H Z Huang,P Fachini,T Dietel,H Caines,T K Nayak,P Jakl,A Kocoloski,F Liu,R Vernet,C A Gagliardi,H G Ritter,J E Draper,Y Zoulkarneeva,S E Vigdor,L S Barnby,M J Russcher,Y Wang,P Seyboth,G D Westfall,M J M Codrington,L Ruan,Y Zhang,D Keane,N K Pruthi,A Ridiger,B Haag,I M Vasilevski,J Sandweiss,Y Panebratsev,Q Li,A H Tang,S J Lindenbaum,M R Cosentino,D P Mahapatra,P Sorensen,L Eun,G Van Buren,R Witt,S Mioduszewski,B K Nandi,L Gaillard,E P Sichtermann,A Gordon,T Kollegger,T Ludlam,M Cherney,L K Mangotra,M Wada,K Krueger,S Timoshenko,F Du,D Grosnick,R Fatemi,J Bouchet,H Wieman,A M Hoffman,F Laue,A M Vander Molen,M Kaplan,W T Waggoner,V Ghazikhanian,J M Landgraf,H S Matis,M Potekhin,S Heppelmann,P Filip,S R Klein,S C Phatak,P Kurnadi,M C Cervantes,P G Jones,A K Bhati,S Lange,G S Averichev,J Lauret,R E Tribble,M J Skoby,A Lebedev,C Whitten,R Derradi De Souza,M Shao,S Chattopadhyay,M Heinz,A Mischke,R Bellwied,J Kapitan,M Tokarev,N Gupta,L Didenko,M Van Leeuwen,A M Poskanzer,J Callner,M Strikhanov,T D S Stanislaus,K Kajimoto,T G Dedovich,N Zachariou,P Yepes,Y N Gorbunov,J C Dunlop,M R Dutta Mazumdar,S M Guertin,G Eppley,S B Nurushev,T J Humanic,A Feng,S Kabana,D Cebra,T Tarnowsky,S Bueltmann,M J Levine,W A Love,W Zhan,S Trentalange,A Meschanin,W Christie,E G Judd,J L Romero,L C Bland,B Grube,S Dash,A Ogawa,A Shabetai,C Pruneau,Q Yue,X Dong,M A Lisa,A R Timmins,M J Horner,W M Zhang,N Schmitz,M Daugherity,J G Cramer,J Engelage,J M Nelson,Yu A Matulenko,J Ulery,T Ullrich,F Jin,N Xu,W W Jacobs,R Varma,E Hjort,Z P Zhang,D Prindle,G Rakness,R Manweiler,M M De Moura,S Raniwala,H J Crawford,M Sarsour,A V Brandin,J Schambach,A I Pavlinov,R P Scharenberg,D D Koetke,J X Zuo,W Peryt,J Millane,M Botje,H Gos,J Speltz,J Pluta,M Dephillips,O D Tsai,P Chaloupka,B Erazmus,W Guryn,A Kechechyan,T S Mcshane,D Relyea,P Djawotho,B E Bonner,V Kouchpil,C Kuhn,W R Edwards,V Perevoztchikov,R S Hollis,M Zawisza,E Braidot,A Hamed,A G Knospe,A A Derevschikov,A Iordanova,J Takahashi,J L Drachenberg,J S Wang,R S Longacre,T Peitzmann,J Cheng,O V Rogachevskiy,A Stadnik,V Okorokov,T Pawlak,A Kisiel,M S Ganti,J W Harris,W J Llope,J Balewski,M Kopytine,D Staszak,D Thein,M J Ng,Q H Xu,D G Underwood,H Bichsel,Y P Viyogi,J P Coffin,V N Tram,Z Xu,X L Wang,M G Munhoz,D Arkhipkin,A Szanto De Toledo,L Kotchenda,A Chikanian,E Elhalhuli,O Barannikova,T J M Symons,A Rose,G Igo,R Zoulkarneev,I Sakrejda,S Margetis,W He,N G Minaev,Y Lu,J Tian,J Baudot,J Liu,B Surrow,S W Wissink,L V Nogach,V I Kravtsov,Y Bai,M Pachr,M Bombara,N L Subba,R R Betts,L G Efimov,T P Burton,G Odyniec,T J Hallman,S U Chung,F Benedosso,C Perkins,J Sowiński ,C Nattrass,K H Kang ,M Sharma,R Majka,E W Hughes,A Bhasin,Subrata Pal ,N Smirnov,Pradipta Ghosh ,O G Grebenyuk ,J H Chen,N Poljak,F Wang,B Potukuchi ,S Bhardwaj,D Lynn,J F Wu ,K Choi ,M A.c Lamont ,X Cai ,Dipayan Das ,A Gupta,S Vokál ,E García-Solis ,T A Trainor,C Markert,D Olson,J H Thomas,K S.f.f Guimaraes ,Z Sun,S Dogra ,Z Ahammed,F Videbæk ,П Кравцов ,H F Chen,J Y Chen,D Beavis ,H Okada,B Mohanty,David Kettler ,G M.s Vasconcelos ,X Wang,Raimond Snellings ,T Sakuma,J F Langdon ,S Salur,M Planinić ,R Singaraju ,T Ljubičić ,G L ,J Putschke,Y Wu,S Blyth ,B D Anderson,J C Webb,C A Miller ,J Fedorišin ,S A Voloshin,J Seger,Zhong Chen ,C Nepali,X Shi ,K Kowalik ,L Liu,Y X Zhao ,Q Wang,R F Clarke,G W Hoffmann,M Šumbera ,C.-H Lee ,Д А Морозов ,Michael L Miller ,J Kiryluk,H Zhang,N Porile,Z Tang,Jian Zhou ,B Hippolyte,M Calderón De La Barca Sánchez,T W Henry,Stephen Baumgart ,Hong Liu ,Ajay Kumar ,R Raniwala,F Simon,J T Mitchell ,P K Netrakanti,R Lednický ,B Srivastava,Y G ,A Vasiliev ,J Bielčík ,В Емелянов ,Alexandre Alarcon Do Passo Suaide ,M Bysterský ,V Yu Khodyrev ,R Sahoo,Alexander Trattner ,X Sun ,Jiang Fu ,C Li,J Bielčíková ,V L Rykov ,S Zhang,J Roberts ,Thomas Michael Cormier ,Z Chajęcki ,H Spinka ,J G ,P Jacobs,I K Yoo ,X Lin,A Hirsch,I Selyuzhenkov

doi:10.1103/physrevlett.101.222001

Abstract

We report precision measurements of the Feynman x (xF) dependence, and first measurements of the transverse momentum (pT) dependence, of transverse single-spin asymmetries for the production of pi0 mesons from polarized proton collisions at sqrt[s] = 200 GeV. The xF dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the pT dependence at fixed xF are not consistent with these same perturbative QCD-based calculations.

Full Text