Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target

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 d...

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Veröffentlicht in:	The journal of high energy physics 2010-06, Vol.2010 (6), Article 19
Hauptverfasser:	Akopov, N., Aschenauer, E. C., Augustyniak, W., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Böttcher, H., Bowles, J., Brodski, I., Burns, J., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., De Nardo, L., De Sanctis, E., Di Nezza, P., Düren, M., Ehrenfried, M., Elbakian, G., Fabbri, R., Fantoni, A., Frullani, S., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Gliske, S., Hill, G., Holler, Y., Imazu, Y., Ivanilov, A., Izotov, A., Jo, H. S., Keri, T., Kinney, E., Kisselev, A., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lapikás, L., Lehmann, I., Lenisa, P., Lorenzon, W., Ma, B.-Q., Manfré, L., Marukyan, H., Miller, C. A., Movsisyan, A., Murray, M., Mussgiller, A., Naryshkin, Y., Nass, A., Negodaev, M., Pappalardo, L. L., 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., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shibata, T.-A., Stancari, M., Steijger, J. J. M., Stenzel, H., Stewart, J., Stinzing, F., Terkulov, A., Trzcinski, A., Vandenbroucke, A., van der Nat, P. B., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vogel, C., Wang, S., Ye, H., Ye, Z., Yen, S., Yu, W., Zeiler, D., Zihlmann, B., Zupranski, P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Classical and Quantum Gravitation Elastic scattering Elementary Particles High energy physics Modulation Particle production Partons Photons Physics Physics and Astronomy Polarization Quantum Field Theories Quantum Field Theory Quantum Physics Relativity Theory String Theory
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Beschreibung
Zusammenfassung:	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: with respect to the target polarisation and 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 φ and cos(0φ) amplitudes observed respectively for the and asymmetries are compatible with the sizeable predictions from the model. Unexpectedly, a sin(2φ) modulation in the asymmetry with a magnitude similar to that of the sin φ modulation is observed.
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP06(2010)019