Transverse-target-spin asymmetry in exclusive $\omega$-meson electroproduction
Abstract
Hard exclusive electroproduction of 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 transition form factor.
Keywords
Cite
@article{arxiv.1508.07612,
title = {Transverse-target-spin asymmetry in exclusive $\omega$-meson electroproduction},
author = {The HERMES Collaboration and A. Airapetian and N. Akopov and Z. Akopov and E. C. Aschenauer and W. Augustyniak and A. Avetissian and S. Belostotski and H. P. Blok and A. Borissov and V. Bryzgalov and G. P. Capitani and G. Ciullo and M. Contalbrigo and P. F. Dalpiaz and W. Deconinck and R. De Leo and E. De Sanctis and M. Diefenthaler and P. Di Nezza and M. Düren and G. Elbakian and F. Ellinghaus and L. Felawka and S. Frullani and D. Gabbert and G. Gapienko and V. Gapienko and V. Gharibyan and F. Giordano and S. Gliske and D. Hasch and M. Hoek and Y. Holler and A. Ivanilov and H. E. Jackson and S. Joosten and R. Kaiser and G. Karyan and T. Keri and E. Kinney and A. Kisselev and V. Korotkov and V. Kozlov and V. G. Krivokhijine and L. Lagamba and L. Lapikás and I. Lehmann and P. Lenisa and W. Lorenzon and B. -Q. Ma and S. I. Manaenkov and Y. Mao and B. Marianski and H. Marukyan and Y. Miyachi and A. Movsisyan and V. Muccifora and Y. Naryshkin and A. Nass and M. Negodaev and W. -D. Nowak and L. L. Pappalardo and R. Perez-Benito and A. Petrosyan and P. E. Reimer and A. R. Reolon and C. Riedl and K. Rith and G. Rosner and A. Rostomyan and J. Rubin and D. Ryckbosch and Y. Salomatin and G. Schnell and B. Seitz and T. -A. Shibata and M. Statera and E. Steffens and J. J. M. Steijger and F. Stinzing and S. Taroian and A. Terkulov and R. Truty and A. Trzcinski and M. Tytgat and Y. Van Haarlem and C. Van Hulse and V. Vikhrov and I. Vilardi and C. Vogel and S. Wang and S. Yaschenko and S. Yen and B. Zihlmann and P. Zupranski},
journal= {arXiv preprint arXiv:1508.07612},
year = {2015}
}
Comments
DESY Report 15-149