Transverse single-spin asymmetry and cross section for π 0 and η mesons at large Feynman x in p ↑ + p collisions at s = 200 GeV

E W Oldag,R A N Oliveira,K Krueger,J Engelage,Ik Yoo,K Yip, N Smirnov, Yong Yi,P Yepes,Yunan Yang,T Tarnowsky,M Elnimr,R N Singaraju,E P Sichtermann,Q Y Shou,S S Shi,A Schmah,L Adamczyk,H Bichsel, M Sharma, B S Sharma,Ming Shao,A Luszczak, G L Ma,Y G Ma,D M M D Madagodagettige Don,D P Mahapatra,E Shahaliev,Nilay D Shah, A K Bhati,P Seyboth,J Seger, A Bhasin, R Majka,O Mall, S Margetis, C Markert,H Masui,H S Matis,D Mcdonald,T S Mcshane, S Mioduszewski,M Mitrovski,Y Mohammed,B Mohanty,B V Morozov, M G Munhoz, M K Mustafa,M Naglis,B K Nandi,Y Pandit,Y X Pan, S K Pal,B S Page, M C Cervantes,R Cendejas, D Cebra,M Pachr,S R Klein,V Kizka, A Kisiel,J Kiryluk,M Calderon De La Barca Sanchez, D G Underwood,T Ullrich,J Turnau,O D Tsai,B A Trzeciak,P Tribedy,Ya Zhang,A Vossen, R E Tribble,S Trentalange, T A Trainor,S A Voloshin,M Tokarev,D Tlusty, J Lauret, A Lebedev,R Lednicky,J H Lee,William Axel Leight,M J Levine,Chaoguo Li,Lin Li,Weijiang Li,Xiangrong Li,P Ostrowski,A V Alakhverdyants, D Olson,J Schambach, A K Sarkar,I Alekseev,E Sangaline,J Sandweiss,A Sandacz, Yufen Li,Fuyun Zhao,S Dhamija,M J M Codrington,R Corliss, J G Cramer,H J Crawford,G M S Vasconcelos,F Videbaek,Y P Viyogi,D P Kikola,D Kettler,A Kesich,A Kechechyan,D Keane,L Didenko, Fengfeng Ding,A Dion, Z Ahammed, M M Aggarwal,G Agakishiev,H M Spinka,S Gupta,D Grosnick,O G Grebenyuk,Y N Gorbunov,H W Ke,K Kauder,J Kapitan,K Kang,S Kabana,S Vokal, S Lapointe,J M Landgraf, M A C Lamont,Xiao Cui,A Davila Leyva,Z M Li, L M Lima, M A Lisa,Fang Liu,T Ljubicic,W J Llope, R S Longacre,Yuan Lu,Xiaoying Luo,E G Judd,J Joseph,C Jena,S Gliske,F J M Geurts,D R Gangadharan,W W Jacobs,G Igo,L Huo, T J Humanic,P Huck,H Z Huang, C A Gagliardi,A R Timmins,Jian Tian,J H Thomas,Y Fisyak,E Finch, B Srivastava,D Thein,L G Efimov,B Pawlik,H Pei,C Perkins, W Peryt,P Pile, Lei Xue,Z Xu, Yihua Xu,Wei Xu,Q H Xu,M Planinic,J Pluta,D Plyku,N Poljak, J B Porter,A M Poskanzer,L H Tarini,C K Riley,Bo Huang,S Horvat,D J Hofman,G W Hoffmann, Annemarie G Hirsch,S Heppelmann,H G Ritter,C B Powell,D Prindle,Zikang Tang,A H Tang,J Takahashi,C Pruneau,D Smirnov,N K Pruthi,M Przybycien,J Seele,P R Pujahari, J Putschke,Haibo Qiu, J B Roberts, J C Dunlop,L E Dunkelberger,O V Rogachevskiy,H Wieman,C Whitten,G D Westfall,J C Webb,G Webb, Yuan Wang,J L Romero,John Ross,L Ruan,J Rusnak,G S Averichev, X L Wang,Qiong Wang,J S Wang, R Raniwala,S Raniwala,R L Ray, R P Redwine,A Szanto De Toledo,T J M Symons,D N Svirida, Rosi Jan Reed,B Surrow, Huijun Wang,P Kravtsov,L Kotchenda,N Xu,Hongxia Xu,K Xin,J P Hayswehle,W Korsch,L I Koroleva,I Koralt,J Konzer,T Kollegger,D D Koetke, S Salur, J W Harris,Lx Han,A Hamed,O Hajkova,B Haag,W Guryn,Wei Xie,Zefen Xiao,I Sakrejda,N R Sahoo,D Solanki,P Sorensen,U G Desouza,M Zawisza,H Zbroszczyk,J Alford, E C Aschenauer,D Arkhipkin,C M Du,B Stringfellow,Y F Wu,W Witzke,B D Anderson,L C De Silva,R Debbe,J B Zhang,C Anson,R Witt,S W Wissink,M Strikhanov, H Caines,X Z Cai,J M Butterworth,T P Burton,J E Draper, J L Drachenberg,Xinwei Dong,I Bunzarov,B Schmidke,N Schmitz,T Schuster,J Chwastowski,P Chung,W Christie, A Chikanian, M Cherney,Jinpei Cheng, Lifu Chen,Jeff Yifu Chen,H F Chen,T G Dedovich, Jianhui Deng, S Bueltmann,E Bruna,S G Brovko,A V Brandin, R P Scharenberg,J Bouchet, Z Sun,W Borowski,I G Bordyuzhin,R Varma, J Bielcikova, J Bielcik,P Djawotho,J R Stevens,J A Vanfossen,Y Zoulkarneeva,Y H Zhu,M J Skoby, Xi Zhu, C Zhong,Jing Zhao,G Van Nieuwenhuizen,G Van Buren,S Chattopadhyay,P Chaloupka, R Stock,Shanshan Zhang,Guangzhong Wang,Feng Wang,M Wada, Yanhui Sun,X M Sun,M Sumbera,M C Suarez,A A P Suaide,W M Zhang,R Derradi De Souza,X P Zhang,T Pawlak,Y Panebratsev,Md Nasim, T K Nayak,L V Nogach,Julia E Novak,G Odyniec,A Ogawa,K Oh, R R Betts,M J Betancourt, R Bellwied,Z P Zhang,D R Beavis,Z Barnovska,A Bannerjee,J Balewski,P Filip,T D S Stanislaus,S G Steadman,R G Fersch,J Fedorisin,S Fazio,R Fatemi,O Evdokimov,L Eun,G Eppley,Lalit Kumar,A Ohlson,V Okorokov

Physical Review D（2012）

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摘要

Measurements of the differential cross section and the transverse single-spin asymmetry, A(N), vs x(F) for pi(0) and eta mesons are reported for 0.4 0.55, is consistent with a perturbative QCD prediction, and the eta/pi(0) cross-section ratio agrees with existing midrapidity measurements. For 0.55 < x(F) < 0.75, the average A(N) for eta is 0.210 +/- 0.056, and that for pi(0) is 0.081 +/- 0.016. The probability that these two asymmetries are equal is similar to 3%.

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关键词

Perturbative QCD,Meson,Feynman diagram,Spin-½,Rapidity,Asymmetry,Monte Carlo method,Particle physics,Transverse plane,Atomic physics,Physics

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