Measurement of azimuthal asymmetries with respect to both beam charge and transverse target polarization in exclusive electroproduction of real photons

Hermes, Collaboration; Airapetian, A.; Akopov, N.; Akopov, Z.; Andrus, A.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetisyan, E.; Barion, Luca; Belostotski, S.; Bianchi, N.; Blok, H. P.; Böttcher, H.; Bonomo, C.; Borissov, A.; Brüll, A.; Bryzgalov, V.; Burns, J.; Capiluppi, Marco; Capitani, G. P.; Cisbani, E.; Ciullo, Giuseppe; Contalbrigo, Marco; Ferretti, Paola; Deconinck, W.; De Leo, R.; Demey, M.; De Nardo, L.; De Sanctis, E.; Diefenthaler, M.; Di Nezza, P.; Dreschler, J.; Düren, M.; Ehrenfried, M.; Elbakian, G.; Ellinghaus, F.; Elschenbroich, U.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Funel, A.; Gabbert, D.; Gapienko, G.; Gapienko, V.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Giordano, Francesca; Gliske, S.; Guler, H.; Hadjidakis, C.; Hasch, D.; Hasegawa, T.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hristova, I.; Iarygin, G.; Imazu, Y.; Ivanilov, A.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Joosten, S.; Kaiser, R.; Keri, T.; Kinney, E.; Kisselev, A.; Kopytin, M.; Korotkov, V.; Kozlov, V.; Kravchenko, P.; Krivokhijine, V. G.; Lagamba, L.; Lamb, R.; Lapikás, L.; Lehmann, I.; Lenisa, Paolo; Linden Levy, L. A.; Lorenzon, W.; Lu, S.; Lu, X.; B. Q., Ma; Mahon, D.; Maiheu, B.; Makins, N. C. R.; Mao, Y.; Marianski, B.; Marukyan, H.; Miller, C. A.; Miyachi, Y.; Muccifora, V.; Murray, M.; Mussgiller, A.; Nagaitsev, A.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W. D.; Osborne, A.; Pappalardo, Luciano Libero; Perez Benito, R.; Pickert, N.; Raithel, M.; Reimer, P. E.; Reischl, A.; Reolon, A. R.; Riedl, C.; Rith, K.; Rock, S. E.; Rosner, G.; Rostomyan, A.; Rubacek, L.; Rubin, J.; Ruiz, A. L.; Ryckbosch, D.; Salomatin, Y.; Sanjiev, I.; Schäfer, A.; Schnell, G.; Schüler, K. P.; Seitz, B.; Shearer, C.; Shibata, T. A.; Shutov, V.; Stancari, Michelle Dawn; Statera, Marco; Steffens, E.; Steijger, J. J. M.; Stenzel, H.; Stewart, J.; Stinzing, F.; Tait, P.; Taroian, S.; Terkulov, A.; Trzcinski, A.; Tytgat, M.; Vandenbroucke, A.; van der Nat, P. B.; van der Steenhoven, G.; Van Haarlem, Y.; Van Hulse, C.; Varanda, M.; Veretennikov, D.; Vikhrov, V.; Vilardi, I.; Vogel, C.; Wang, S.; Yaschenko, S.; Ye, H.; Ye, Z.; Yen, S.; Yu, W.; Zeiler, D.; Zihlmann, B.; Zupranski, P.

doi:10.1088/1126-6708/2008/06/066

Azimuthal asymmetries in exclusive electroproduction of real photons are measured for the first time with respect to transverse target polarisation, providing new constraints on Generalized Parton Distributions. From the same data set on a hydrogen target, new results for the beam-charge asymmetry are also extracted with better precision than those previously reported. By comparing model calculations with measured asymmetries attributed to the interference between the deeply virtual Compton scattering and Bethe-Heitler processes, a model-dependent constraint is obtained on the total angular momenta carried by up and down quarks in the nucleon.

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Data di pubblicazione:	2008
Titolo:	Measurement of azimuthal asymmetries with respect to both beam charge and transverse target polarization in exclusive electroproduction of real photons
Autori:	HERMES collaboration; A. Airapetian; N. Akopov; Z. Akopov; A. Andrus; E.C. Aschenauer; W. Augustyniak; R. Avakian; A. Avetissian; E. Avetisyan; L. Barion; S. Belostotski; N. Bianchi; H.P. Blok; H. Böttcher; C. Bonomo; A. Borissov; A. Brüll; V. Bryzgalov; J. Burns; M. Capiluppi; G.P. Capitani; E. Cisbani; G. Ciullo; M. Contalbrigo; P.F. Dalpiaz; W. Deconinck; R. De Leo; M. Demey; L. De Nardo; E. De Sanctis; M. Diefenthaler; P. Di Nezza; J. Dreschler; M. Düren; M. Ehrenfried; G. Elbakian; F. Ellinghaus; U. Elschenbroich; R. Fabbri; A. Fantoni; L. Felawka; S. Frullani; A. Funel; D. Gabbert; G. Gapienko; V. Gapienko; F. Garibaldi; G. Gavrilov; V. Gharibyan; F. Giordano; S. Gliske; H. Guler; C. Hadjidakis; D. Hasch; T. Hasegawa; G. Hill; A. Hillenbrand; M. Hoek; Y. Holler; I. Hristova; G. Iarygin; Y. Imazu; A. Ivanilov; A. Izotov; H.E. Jackson; A. Jgoun; S. Joosten; R. Kaiser; T. Keri; E. Kinney; A. Kisselev; M. Kopytin; V. Korotkov; V. Kozlov; P. Kravchenko; V.G. Krivokhijine; L. Lagamba; R. Lamb; L. Lapikás; I. Lehmann; P. Lenisa; L.A. Linden-Levy; W. Lorenzon; S. Lu; X. Lu; B.-Q. Ma; D. Mahon; B. Maiheu; N.C.R. Makins; Y. Mao; B. Marianski; H. Marukyan; C.A. Miller; Y. Miyachi; V. Muccifora; M. Murray; A. Mussgiller; A. Nagaitsev; E. Nappi; Y. Naryshkin; A. Nass; M. Negodaev; W.-D. Nowak; A. Osborne; L.L. Pappalardo; R. Perez-Benito; N. Pickert; M. Raithel; P.E. Reimer; A. Reischl; A.R. Reolon; C. Riedl; K. Rith; S.E. Rock; G. Rosner; A. Rostomyan; L. Rubacek; J. Rubin; A.L. Ruiz; D. Ryckbosch; Y. Salomatin; I. Sanjiev; A. Schäfer; G. Schnell; K.P. Schüler; B. Seitz; C.Shearer; T.-A. Shibata; V. Shutov; M. Stancari; M. Statera; E. Steffens; J.J.M. Steijger; H. Stenzel; J. Stewart; F. Stinzing; P. Tait; S. Taroian; A. Terkulov; A. Trzcinski; M. Tytgat; A. Vandenbroucke; P.B. van der Nat; G. van der Steenhoven; Y. Van Haarlem; C. Van Hulse; M. Varanda; D. Veretennikov; V. Vikhrov; I. Vilardi; C. Vogel; S. Wang; S. Yaschenko; H. Ye; Z. Ye; S. Yen; W. Yu; D. Zeiler; B. Zihlmann; P. Zupranski
Rivista:	JOURNAL OF HIGH ENERGY PHYSICS
Parole Chiave:	Lepton-Nucleon Scattering
Abstract:	Azimuthal asymmetries in exclusive electroproduction of real photons are measured for the first time with respect to transverse target polarisation, providing new constraints on Generalized Parton Distributions. From the same data set on a hydrogen target, new results for the beam-charge asymmetry are also extracted with better precision than those previously reported. By comparing model calculations with measured asymmetries attributed to the interference between the deeply virtual Compton scattering and Bethe-Heitler processes, a model-dependent constraint is obtained on the total angular momenta carried by up and down quarks in the nucleon.
Digital Object Identifier (DOI):	10.1088/1126-6708/2008/06/066
Handle:	http://hdl.handle.net/11392/530796
Appare nelle tipologie:	03.1 Articolo su rivista

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