Transverse-target-spin asymmetry in exclusive omega-meson electroproduction

A. Airapetian, N. Akopov, Z. Akopov, E.C. Aschenauer, W. Augustyniak, A. Avetissian, S. Belostotski, H.P. Blok, A. Borissov, V. Bryzgalov, G.P. Capitani, G. Ciullo, M. Contalbrigo, P.F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. DuerenG. Elbakian, F. Ellinghaus, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, V. Gharibyan, F. Giordano, S. Gliske, D. Hasch, M. van Hoek, Y. Holler, A. Ivanilov, H.E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, V.G. Krivokhijine, L. Lagamba, L. Lapikas, I. Lehmann, P. Lenisa, W. Lorenzon, B.-. Ma, S.I. Manaenkov, Y. Mao, B. Marianski, H. Marukyan, Y. Miyachi, A. Movsisyan, V. Muccifora, Y. Naryshkin, A. Nass, M. Negodaev, W.-. Nowak, L.L. Pappalardo, R. Perez-Benito, A. Petrosyan, P.E. Reimer, A.R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, G. Schnell, B. Seitz, T.-. Shibata, M. Statera, E. Steffens, J.J.M. Steijger, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, V. Vikhrov, I. Vilardi, C. Vogel, S. Wang, S. Yaschenko, S. Yen, B. Zihlmann, P. Zupranski

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Hard exclusive electroproduction of $$\omega $$ω mesons is studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. The amplitudes of five azimuthal modulations of the single-spin asymmetry of the cross section with respect to the transverse proton polarization are measured. They are determined in the entire kinematic region as well as for two bins in photon virtuality and momentum transfer to the nucleon. Also, a separation of asymmetry amplitudes into longitudinal and transverse components is done. These results are compared to a phenomenological model that includes the pion pole contribution. Within this model, the data favor a positive $$\pi \omega $$πω transition form factor.
Original languageEnglish
Pages (from-to)600-600
JournalEuropean Physical Journal C. Particles and Fields
Volume75
Issue number12
DOIs
Publication statusPublished - 2015

Bibliographical note

PT: J; NR: 23; TC: 0; J9: EUR PHYS J C; PG: 8; GA: CZ1DG; UT: WOS:000366845400002

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