Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target

Airapetian, A.; Akopov, N.; Akopov, Z.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetisyan, E.; Ball, B.; Belostotski, S.; Bianchi, N.; Blok, H. P.; Bottcher, H.; Borissov, A.; Bowles, J.; Brodski, I.; Bryzgalov, V.; Burns, J.; Capiluppi, Marco; Capitani, G. P.; Cisbani, E.; Ciullo, Giuseppe; Contalbrigo, Marco; Ferretti, Paola; Deconinck, W.; Leo, R. D.; Nardo, L. D.; Sanctis, E. D.; Diefenthaler, M.; Nezza, P. D.; Duren, M.; Ehrenfried, M.; Elbakian, G.; Ellinghaus, F.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Gabbert, D.; Gapienko, G.; Gapienko, V.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Giordano, Francesca; Gliske, S.; Golembiovskaya, M.; Hadjidakis, C.; Hartig, M.; Hasch, D.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hristova, I.; Imazu, Y.; Ivanilov, A.; Izotov, A.; Jackson, H.; H. S., Jo; Joosten, S.; Kaiser, R.; Karyan, G.; Keri, T.; Kinney, E.; Kisselev, A.; Kobayashi, N.; Korotkov, V.; Kozlov, V.; Kravchenko, P.; Krivokhijine, V. G.; Lagamba, L.; Lamb, R.; Lapikas, L.; Lehmann, I.; Lenisa, Paolo; Linden Levy, L. A.; Ruiz, A. L.; Lorenzon, W.; X. G., Lu; X. R., Lu; B. Q., Ma; Mahon, D.; Makins, N. C. R.; Manaenkov, S. I.; Manfre, L.; Mao, Y.; Marianski, B.; de la Ossa, A. M.; Marukyan, H.; Miller, C. A.; Miyachi, Y.; Movsisyan, A.; Muccifora, V.; Murray, M.; Mussgiller, A.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W. D.; Pappalardo, Luciano Libero; Perez Benito, R.; Pickert, N.; Raithel, M.; Reimer, P. E.; Reolon, A. R.; Riedl, C.; Rith, K.; Rosner, G.; Rostomyan, A.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanftl, F.; Schafer, A.; Schnell, G.; Schuler, K. P.; Seitz, B.; Shibata, T. A.; Shutov, V.; Stancari, Michelle Dawn; Statera, Marco; Steffens, E.; Steijger, J. J. M.; Stenzel, H.; Stewart, J.; Stinzing, F.; Taroian, S.; Terkulov, A.; Trzcinski, A.; Tytgat, M.; Vandenbroucke, A.; van der Nat, P. B.; Haarlem, Y. v.; Hulse, C. V.; 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:10.1007/JHEP06(2010)019

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Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: A(UL) with respect to the target polarisation and A(LL) with respect to the product of the beam and target polarisations. Results for both asymmetries are compared to the predictions from a generalised parton distribution model. The sin phi and cos(0 phi) amplitudes observed respectively for the A(UL) and A(LL) asymmetries are compatible with the sizeable predictions from the model. Unexpectedly, a sin(2 phi) modulation in the A(UL) asymmetry with a magnitude similar to that of the sin phi modulation is observed.

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Titolo:	Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target
Autori:	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 A. Borissov J. Bowles I. Brodski V. Bryzgalov J. Burns CAPILUPPI, Marco G. P. Capitani E. Cisbani CIULLO, Giuseppe CONTALBRIGO, Marco FERRETTI, Paola W. Deconinck R. D. Leo L. D. Nardo E. D. Sanctis M. Diefenthaler P. D. Nezza M. Duren M. Ehrenfried G. Elbakian F. Ellinghaus R. Fabbri A. Fantoni L. Felawka S. Frullani D. Gabbert G. Gapienko V. Gapienko F. Garibaldi G. Gavrilov V. Gharibyan GIORDANO, Francesca S. Gliske M. Golembiovskaya C. Hadjidakis M. Hartig D. Hasch G. Hill A. Hillenbrand M. Hoek Y. Holler I. Hristova Y. Imazu A. Ivanilov A. Izotov H. Jackson H. S. Jo S. Joosten R. Kaiser G. Karyan T. Keri E. Kinney A. Kisselev N. Kobayashi V. Korotkov V. Kozlov P. Kravchenko V. G. Krivokhijine L. Lagamba R. Lamb L. Lapikas I. Lehmann LENISA, Paolo L. A. Linden Levy A. L. Ruiz W. Lorenzon X. G. Lu X. R. Lu B. Q. Ma D. Mahon N. C. R. Makins S. I. Manaenkov L. Manfre Y. Mao B. Marianski A. M. de la Ossa H. Marukyan C. A. Miller Y. Miyachi A. Movsisyan V. Muccifora M. Murray A. Mussgiller E. Nappi Y. Naryshkin A. Nass M. Negodaev W. D. Nowak PAPPALARDO, Luciano Libero R. Perez Benito N. Pickert M. Raithel P. E. 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 STANCARI, Michelle Dawn STATERA, Marco E. Steffens J. J. M. Steijger H. Stenzel J. Stewart F. Stinzing S. Taroian A. Terkulov A. Trzcinski M. Tytgat A. Vandenbroucke P. B. van der Nat Y. v. Haarlem C. V. Hulse 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 mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2010
Rivista:	JOURNAL OF HIGH ENERGY PHYSICS
Abstract:	Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: A(UL) with respect to the target polarisation and A(LL) with respect to the product of the beam and target polarisations. Results for both asymmetries are compared to the predictions from a generalised parton distribution model. The sin phi and cos(0 phi) amplitudes observed respectively for the A(UL) and A(LL) asymmetries are compatible with the sizeable predictions from the model. Unexpectedly, a sin(2 phi) modulation in the A(UL) asymmetry with a magnitude similar to that of the sin phi modulation is observed.
Handle:	http://hdl.handle.net/11392/1436911
Appare nelle tipologie:	03.1 Articolo su rivista

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