Measurement of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target

Double-spin asymmetries in exclusive electroproduction of real photons from a transversely polarized hydrogen target are measured with respect to the product of target polarization with beam helicity and beam charge, and with respect to the product of target polarization with beam helicity alone. Th...

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Published in:Physics letters. B 2011-10, Vol.704 (1), p.15-23
Main Authors: Airapetian, A., Akopov, N., Akopov, Z., Aschenauer, E.C., Avakian, R., Blok, H.P., Borissov, A., Bowles, J., Brodski, I., Burns, J., Capiluppi, M., Capitani, G.P., Ciullo, G., Contalbrigo, M., Dalpiaz, P.F., Deconinck, W., De Nardo, L., De Sanctis, E., Di Nezza, P., Ehrenfried, M., Ellinghaus, F., Fantoni, A., Felawka, L., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Golembiovskaya, M., Hartig, M., Hasch, D., Holler, Y., Hristova, I., Jackson, H.E., Joosten, S., Kaiser, R., Karyan, G., Keri, T., Kinney, E., Kisselev, A., Kozlov, V., Kravchenko, P., Krivokhijine, V.G., Lagamba, L., Lapikás, L., Lenisa, P., López Ruiz, A., Lorenzon, W., Lu, X.-G., Lu, X.-R., Ma, B.-Q., Mahon, D., Makins, N.C.R., Manaenkov, S.I., Mao, Y., Marianski, B., Miller, C.A., Movsisyan, A., Murray, M., Mussgiller, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Perez-Benito, R., Raithel, M., Reolon, A.R., Rith, K., Rosner, G., Rostomyan, A., Ryckbosch, D., Schäfer, A., Schnell, G., Schüler, K.P., Seitz, B., Shutov, V., Statera, M., Steffens, E., Steijger, J.J.M., Stinzing, F., Terkulov, A., Truty, R., Trzcinski, A., Tytgat, M., Van Haarlem, Y., Van Hulse, C., Veretennikov, D., Vikhrov, V., Vilardi, I., Wang, S., Yaschenko, S., Ye, Z., Zagrebelnyy, V., Zeiler, D., Zihlmann, B., Zupranski, P.
Format: Article
Language:English
Subjects:
Asymmetry
Beams (radiation)
DVCS
Elastic scattering
Elementary particles
Exact sciences and technology
GPDs
Helicity
HERMES experiments
Mathematical analysis
Nuclear physics
Photons
Physics
Polarization
The physics of elementary particles and fields
Transversely polarized hydrogen target
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Summary:Double-spin asymmetries in exclusive electroproduction of real photons from a transversely polarized hydrogen target are measured with respect to the product of target polarization with beam helicity and beam charge, and with respect to the product of target polarization with beam helicity alone. The asymmetries arise from the deeply virtual Compton scattering process and its interference with the Bethe–Heitler process. They are related to the real part of the same combination of Compton form factors as that determining the previously published transverse target single-spin asymmetries through the imaginary part. The results for the double-spin asymmetries are found to be compatible with zero within the uncertainties of the measurement, and are not incompatible with the predictions of the only available GPD-based calculation.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2011.08.067