Skip to Main content Skip to Navigation
Journal articles

Measurement of ep->ep $\pi^0$ beam spin asymmetries above the resonance region

R. de Masi 1, 2 M. Garcon 1 B. Zhao M.J. Amaryan P. Ambrozewicz M. Anghinolfi G. Asryan H. Avakian H. Bagdasaryan N. Baillie J. Ball 1 J.P. Ball N.A. Baltzell V. Batourine M. Battaglieri I. Bedlinskiy M. Bellis N. Benmouna B.L. Berman P.Y. Bertin 3 A.S. Biselli L. Blaszczyk S. Bouchigny 2 S. Boiarinov R. Bradford D. Branford W.J. Briscoe W.K. Brooks S. Bultmann V.D. Burkert C. Butuceanu J.R. Calarco S.L. Careccia D.S. Carman L. Casey S. Chen L. Cheng P.L. Cole P. Collins P. Coltharp D. Crabb V. Crede N. Dashyan E. de Sanctis R. de Vita P.V. Degtyarenko A. Deur K.V. Dharmawardane R. Dickson C. Djalali G.E. Dodge J. Donnelly D. Doughty M. Dugger O.P. Dzyubak H. Egiyan K.S. Egiyan L. El Fassi L. Elouadrhiri P. Eugenio G. Fedotov G. Feldman A. Fradi 2 H. Funsten G. Gavalian G.P. Gilfoyle K.L. Giovanetti F.X. Girod 1 J.T. Goetz A. Gonenc R.W. Gothe K.A. Griffioen M. Guidal 2 N. Guler L. Guo V. Gyurjyan K. Hafidi H. Hakobyan C. Hanretty F.W. Hersman K. Hicks I. Hleiqawi M. Holtrop C.E. Hyde-Wright Y. Ilieva D.G. Ireland B.S. Ishkhanov E.L. Isupov M.M. Ito D. Jenkins H.S. Jo 2 J.R. Johnstone K. Joo H.G. Juengst N. Kalantarians J.D. Kellie M. Khandaker W. Kim A. Klein F.J. Klein A.V. Klimenko M. Kossov Z. Krahn L.H. Kramer V. Kubarovsky J. Kuhn S.E. Kuhn S.V. Kuleshov J. Lachniet J.M. Laget J. Langheinrich D. Lawrence T. Lee K. Livingston H.Y. Lu M. Maccormick 2 N. Markov P. Mattione M. Mazouz 4 B. Mckinnon B.A. Mecking M.D. Mestayer C.A. Meyer T. Mibe B. Michel 3 K. Mikhailov M. Mirazita R. Miskimen V. Mokeev B. Moreno 2 K. Moriya S.A. Morrow 1, 2 M. Moteabbed E. Munevar G.S. Mutchler P. Nadel-Turonski R. Nasseripour S. Niccolai 2 G. Niculescu I. Niculescu B.B. Niczyporuk M.R. Niroula R.A. Niyazov M. Nozar M. Osipenko A.I. Ostrovidov K. Park E. Pasyuk C. Paterson S. Anefalos Pereira J. Pierce N. Pivnyuk D. Pocanic O. Pogorelko S. Pozdniakov J.W. Price S. Procureur 1 Y. Prok D. Protopopescu B.A. Raue G. Ricco M. Ripani B.G. Ritchie F. Ronchetti G. Rosner P. Rossi F. Sabatie 1 J. Salamanca C. Salgado J.P. Santoro V. Sapunenko R.A. Schumacher V.S. Serov Y.G. Sharabian D. Sharov N.V. Shvedunov E.S. Smith L.C. Smith D.I. Sober D. Sokhan A. Stavinsky S. Stepanyan S.S. Stepanyan B.E. Stokes P. Stoler I.I. Strakovsky S. Strauch M. Taiuti D.J. Tedeschi A. Tkabladze S. Tkachenko C. Tur M. Ungaro M.F. Vineyard A.V. Vlassov E. Voutier 4 D.P. Watts L.B. Weinstein D.P. Weygand M. Williams E. Wolin M.H. Wood A. Yegneswaran L. Zana J. Zhang Z.W. Zhao
Abstract : The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin(phi) function and their amplitudes are extracted. Overall, they are of the order of 0.04 - 0.11 and roughly independent of t. This is the signature of a non-zero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00192985
Contributor : Dominique Girod <>
Submitted on : Friday, November 30, 2007 - 10:44:32 AM
Last modification on : Thursday, November 19, 2020 - 12:58:54 PM

Links full text

Identifiers

Citation

R. de Masi, M. Garcon, B. Zhao, M.J. Amaryan, P. Ambrozewicz, et al.. Measurement of ep->ep $\pi^0$ beam spin asymmetries above the resonance region. Physical Review C, American Physical Society, 2008, 77, pp.042201. ⟨10.1103/PhysRevC.77.042201⟩. ⟨in2p3-00192985⟩

Share

Metrics

Record views

484