Search for a two-photon exchange contribution to inclusive deep-inelastic scattering

A Airapetian,N Akopov,Z Akopov,E C Aschenauer,W Augustyniak,R Avakian,A Avetissian,E Avetisyan,B Ball,S Belostotski,N Bianchi,H P Blok,H Bottcher,C Bonomo,A Borissov,J Bowles,V Bryzgalov,J C Burns,G P Capitani,E Cisbani,G Ciullo,M Contalbrigo,P F Dalpiaz,W Deconinck,L De Nardo,E De Sanctis,M Diefenthaler,P Di Nezza,M Duren,M Ehrenfried,G Elbakian,F Ellinghaus, R Fabbri,A Fantoni,L Felawka,S Frullani,D Gabbert,G Gapienko,V A Gapienko,F Garibaldi,V Gharibyan,F Giordano,S Gliske, C Hadjidakis,M Hartig,D Hasch,G Hill,A Hillenbrand,M Hoek,Y Holler, I Hristova,Y Imazu,A A Ivanilov,H E Jackson,H S Jo,S Joosten,R Kaiser,G Karyan,T Keri, E Kinney,A V Kisselev, V A Korotkov,V A Kozlov,P Kravchenko,L Lagamba,R Lamb,L Lapikas,I Lehmann,P Lenisa,A Lopez Ruiz,W Lorenzon, X R Lu,B Q Ma,D Mahon,N C R Makins,L Manfre,Y Mao,B Marianski,A Martinez De La Ossa,H Marukyan,C A Miller,Y Miyachi,A Movsisyan, V Muccifora,Michael Murray,Andreas Mussgiller,Y Naryshkin,A Nass,M Negodaev,W D Nowak,L L Pappalardo,R Perezbenito,M Raithel,P Reimer,A R Reolon,C Riedl,K Rith,G Rosner,A Rostomyan,J Rubin, D Ryckbosch,Y Salomatin,F Sanftl,A Schafer,G Schnell,K P Schuler,B Seitz,T A Shibata,V Shutov,M Stancari,M Statera,E Steffens,J J M Steijger, H Stenzel, Jill R Stewart,F Stinzing,S Taroian,A Terkulov,A Trzcinski,M Tytgat,A Vandenbroucke,P B Van Der Nat,Y Van Haarlem,C Van Hulse,M Varanda,D Veretennikov,V Vikhrov,I Vilardi,S Wang,S Yaschenko,Hongying Ye,Z Ye,Weidong Yu,D Zeiler,B Zihlmann,P Zupranski

Physics Letters B（2010）

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摘要

The transverse-target single-spin asymmetry for inclusive deep-inelastic scattering with effectively unpolarized electron and positron beams off a transversely polarized hydrogen target was measured, with the goal of searching for a two-photon exchange signal in the kinematic range 0.0071GeV2 and Q2<1GeV2, and for both electron and positron beams, the asymmetries are found to be consistent with zero within statistical and systematic uncertainties, which are of order 10−3 for the asymmetries integrated over xB.

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关键词

13.60.-r,13.60.Hb,13.88.+e,14.20.Dh,14.65.-q

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