Transverse-target-spin asymmetry in exclusive ω-meson electroproduction: The HERMES Collaboration

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. DürenG. Elbakian, F. Ellinghaus, L. Felawka, S. Frullani, D. Gabbert, G. Gapienko, V. Gapienko, V. Gharibyan, F. Giordano, S. Gliske, D. Hasch, M. 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. Lapikás, I. Lehmann, P. Lenisa, W. Lorenzon, B. Q. Ma, S. I. Manaenkov, Y. Mao, B. Marianski, H. Marukyan, Y. Miyachi, A. Movsisyan, V. Muccifora, Y. Naryshkin, A. Nass, M. Negodaev, W. D. 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. A. 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 journalArticlepeer-review

8 Scopus citations


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 (US)
Article number600
Pages (from-to)1-8
Number of pages8
JournalEuropean Physical Journal C
Issue number12
StatePublished - Dec 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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