Single spin asymmetry AN in polarized proton-proton elastic scattering at s=200GeV

L. Adamczyk,G. Agakishiev, M. M. Aggarwal, Z. Ahammed,A. V. Alakhverdyants, I. Alekseev,J. Alford,C. D. Anson,D. Arkhipkin,E. Aschenauer,G. S. Averichev,J. Balewski,A. Banerjee,Z. Barnovska,D. R. Beavis,R. Bellwied,M. J. Betancourt,R. R. Betts,A. Bhasin, A. K. Bhati, H. Bichsel, J. Bielcik, J. Bielcikova,L. C. Bland,I. G. Bordyuzhin, W. Borowski,J. Bouchet,A. V. Brandin,S. G. Brovko,E. Bruna,S. Bültmann,I. Bunzarov,T. P. Burton,J. Butterworth,X. Z. Cai, H. Caines,M. Calderón de la Barca Sánchez, D. Cebra,R. Cendejas,M. C. Cervantes,P. Chaloupka, Z. Chang,S. Chattopadhyay, H. F. Chen,J. H. Chen,J. Y. Chen,L. Chen,J. Cheng, M. Cherney, A. Chikanian,W. Christie,P. Chung,J. Chwastowski,M. J.M. Codrington,R. Corliss, J. G. Cramer,H. J. Crawford, X. Cui,S. Das,A. Davila Leyva,L. C. De Silva,R. R. Debbe,T. G. Dedovich, J. Deng,R. Derradi de Souza,S. Dhamija,L. Didenko,F. Ding,A. Dion,P. Djawotho,X. Dong,J. L. Drachenberg, J. E. Draper,C. M. Du,L. E. Dunkelberger,J. C. Dunlop,L. G. Efimov,M. Elnimr,J. Engelage, G. Eppley,L. Eun,O. Evdokimov,R. Fatemi,S. Fazio, J. Fedorisin,R. G. Fersch,P. Filip,E. Finch,Y. Fisyak,C. A. Gagliardi,D. R. Gangadharan,F. Geurts,A. Gibson,S. Gliske,Y. N. Gorbunov,O. G. Grebenyuk, D. Grosnick,S. Gupta, W. Guryn,B. Haag,O. Hajkova,A. Hamed, L. X. Han,J. W. Harris,J. P. Hays-Wehle, S. Heppelmann, A. Hirsch, G. W. Hoffmann,D. J. Hofman,S. Horvat,B. Huang, H. Z. Huang, P. Huck,T. J. Humanic, L. Huo, G. Igo,W. W. Jacobs,C. Jena,E. G. Judd, S. Kabana, K. Kang, J. Kapitan, K. Kauder,H. W. Ke, D. Keane,A. Kechechyan,A. Kesich,D. P. Kikola, J. Kiryluk, I. Kisel,A. Kisiel, V. Kizka, S. R. Klein, D. D. Koetke, T. Kollegger, J. Konzer,I. Koralt,L. Koroleva, W. Korsch, L. Kotchenda,P. Kravtsov, K. Krueger, I. Kulakov,L. Kumar, M. A.C. Lamont,J. M. Landgraf, S. LaPointe, J. Lauret, A. Lebedev, R. Lednicky,J. H. Lee, W. Leight,M. J. LeVine,C. Li, L. Li,W. Li,X. Li,Y. Li,Z. M. Li,L. M. Lima,M. A. Lisa,F. Liu, T. Ljubicic,W. J. Llope,R. S. Longacre,Y. Lu, X. Luo,A. Luszczak,G. L. Ma,Y. G. Ma,D. M.M.D. Madagodagettige Don, D. P. Mahapatra, R. Majka,O. I. Mall,S. Margetis, C. Markert,H. Masui,H. S. Matis,D. McDonald, T. S. McShane, S. Mioduszewski,M. K. Mitrovski,Y. Mohammed,B. Mohanty,M. M. Mondal,B. Morozov, M. G. Munhoz, M. K. Mustafa, M. Naglis,B. K. Nandi, Nasim,T. K. Nayak,J. M. Nelson,L. V. Nogach,J. Novak, G. Odyniec,A. Ogawa,K. Oh,A. Ohlson, V. Okorokov,E. W. Oldag,R. A.N. Oliveira, D. Olson,P. Ostrowski, M. Pachr,B. S. Page, S. K. Pal,Y. X. Pan,Y. Pandit, Y. Panebratsev,T. Pawlak,B. Pawlik,H. Pei,C. Perkins, W. Peryt,P. Pile, M. Planinic, J. Pluta,Donika Plyku,N. Poljak,J. Porter, A. M. Poskanzer, C. B. Powell, C. Pruneau,N. K. Pruthi, M. Przybycien,P. R. Pujahari, J. Putschke,H. Qiu, R. Raniwala, S. Raniwala, R. L. Ray,R. Redwine,R. Reed, C. K. Riley, H. G. Ritter,J. B. Roberts, O. V. Rogachevskiy,J. L. Romero,J. F. Ross,L. Ruan,J. Rusnak,N. R. Sahoo,P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz,J. Sandweiss,E. Sangaline, A. Sarkar, J. Schambach,R. P. Scharenberg, A. M. Schmah, B. Schmidke, N. Schmitz, T. R. Schuster, J. Seele, J. Seger, P. Seyboth,N. Shah, E. Shahaliev,M. Shao,B. Sharma, M. Sharma,S. S. Shi,Q. Y. Shou,E. P. Sichtermann, R. N. Singaraju,M. J. Skoby,D. Smirnov,N. Smirnov,D. Solanki,P. Sorensen,U. G. deSouza,H. M. Spinka,B. Srivastava,T. D.S. Stanislaus, S. G. Steadman,J. R. Stevens,R. Stock,M. Strikhanov,B. Stringfellow,A. A.P. Suaide, M. C. Suarez, M. Sumbera,X. M. Sun,Y. Sun, Z. Sun, B. Surrow,D. N. Svirida, T. J.M. Symons,A. Szanto de Toledo, J. Takahashi,A. H. Tang,Z. Tang,L. H. Tarini,T. Tarnowsky, D. Thein, J. H. Thomas,J. Tian, A. R. Timmins,D. Tlusty,M. Tokarev,S. Trentalange,R. E. Tribble,P. Tribedy,B. A. Trzeciak,O. D. Tsai,J. Turnau,T. Ullrich,D. G. Underwood,G. Van Buren,G. van Nieuwenhuizen,J. A. Vanfossen,R. Varma, G. M.S. Vasconcelos,F. Videbæk,Y. P. Viyogi,S. Vokal,S. A. Voloshin,A. Vossen, M. Wada, F. Wang,G. Wang, H. Wang, J. S. Wang,Q. Wang, X. L. Wang,Y. Wang,G. Webb, J. C. Webb,G. D. Westfall, C. Whitten, H. Wieman,S. W. Wissink, R. Witt, W. Witzke,Y. F. Wu, Z. Xiao, W. Xie,K. Xin,H. Xu, N. Xu,Q. H. Xu,W. Xu,Y. Xu,Z. Xu,L. Xue,Y. Yang,P. Yepes,Y. Yi,K. Yip, I. K. Yoo, M. Zawisza, H. Zbroszczyk,J. B. Zhang,S. Zhang,X. P. Zhang, Y. Zhang,Z. P. Zhang, F. Zhao,J. Zhao,C. Zhong, X. Zhu,Y. H. Zhu, Y. Zoulkarneeva, M. Zyzak

mag（2013）

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摘要

We report a high precision measurement of the transverse single spin asymmetry A(N) at the center of mass energy root s = 200 GeV in elastic proton-proton scattering by the STAR experiment at RHIC. The A(N) was measured in the four-momentum transfer squared t range 0.003 <= vertical bar t vertical bar <= 0.035 (GeV/c)(2), the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of A(N) and its t-dependence are consistent with a vanishing hadronic spin-flip amplitude, thus providing strong constraints on the ratio of the single spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated by the Pomeron amplitude at this root s, we conclude that this measurement addresses the question about the presence of a hadronic spin flip due to the Pomeron exchange in polarized proton-proton elastic scattering. (c) 2013 Elsevier B.V. All rights reserved.

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关键词

Scattering amplitude,Elastic scattering,Scattering,Pomeron,Amplitude,Spin-½,Hadron,Proton,Nuclear physics,Particle physics,Physics

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