Single Spin Asymmetry $A_N$ in Polarized Proton-Proton Elastic Scattering at $\sqrt{s}=200$ GeV

L Adamczyk,G Agakishiev, M M Aggarwal, Z Ahammed,A V Alakhverdyants,I Alekseev,J Alford,C Anson,D Arkhipkin,E C Aschenauer,G S Averichev,J Balewski,Amiya K 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 Bultmann,I Bunzarov,T P Burton,J M Butterworth,X Z Cai,H Caines,M Calderon De La Barca Sanchez, D Cebra,R Cendejas,M C Cervantes,P Chaloupka,Z Chang,S Chattopadhyay, H F Chen, J H Chen,Liang 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,Xiaofeng Cui,S Das,A Davila Leyva,L C De Silva,R Debbe,T G Dedovich, Junming Deng,R Derradi De Souza,S Dhamija,L Didenko,Fei 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,Olga Evdokimov,R Fatemi,S Fazio, J Fedorisin,R G Fersch,P Filip,E Finch,Y Fisyak,C A Gagliardi,D R Gangadharan,F J M Geurts,A Gibson,S Gliske,Y N Gorbunov, O G Grebenyuk,D Grosnick,S K Gupta,W Guryn

PHYSICS LETTERS B（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

Polarization,Elastic scattering

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