Measurement of the beam spin asymmetry of e→p→epη in the deep-inelastic regime with CLAS

B. Zhao, A. Kim, K. Joo, I. Bedlinskiy, W. Kim, V. Kubarovsky, M. Ungaro, S. Adhikari, Z. Akbar, G. Angelini, H. Avakian, J. Ball, N. A. Baltzell, L. Barion, M. Bashkanov, M. Battaglieri, V. Batourine, A. S. Biselli, S. Boiarinov, W. J. BriscoeW. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, P. Chatagnon, T. Chetry, G. Ciullo, L. Clark, B. A. Clary, P. L. Cole, M. Contalbrigo, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, M. Defurne, A. Deur, S. Diehl, C. Djalali, R. Dupre, H. Egiyan, M. Ehrhart, A. El Alaoui, L. El Fassi, P. Eugenio, A. Filippi, T. A. Forest, G. Gavalian, Y. Ghandilyan, G. P. Gilfoyle, F. X. Girod, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, L. Guo, K. Hafidi, H. Hakobyan, N. Harrison, M. Hattawy, D. Heddle, K. Hicks, M. Holtrop, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, D. Jenkins, H. S. Jo, S. Johnston, M. L. Kabir, D. Keller, G. Khachatryan, M. Khachatryan, M. Khandaker, A. Klein, F. J. Klein, S. E. Kuhn, S. V. Kuleshov, L. Lanza, P. Lenisa, K. Livingston, I. J.D. MacGregor, D. Marchand, N. Markov, B. McKinnon, C. A. Meyer, Z. E. Meziani, M. Mirazita, V. Mokeev, R. A. Montgomery, C. Munoz Camacho, P. Nadel-Turonski, S. Niccolai, G. Niculescu, M. Osipenko, A. I. Ostrovidov, M. Paolone, R. Paremuzyan, K. Park, O. Pogorelko, J. W. Price, Y. Prok, D. Protopopescu, M. Ripani, A. Rizzo, G. Rosner, P. Rossi, F. Sabatié, C. Salgado, R. A. Schumacher, Y. G. Sharabian, Iu Skorodumina, G. D. Smith, D. Sokhan, N. Sparveris, S. Stepanyan, I. I. Strakovsky, S. Strauch, M. Taiuti, J. A. Tan, H. Voskanyan, E. Voutier, R. Wang, X. Wei, M. H. Wood, N. Zachariou, J. Zhang, Z. W. Zhao

Resultado de la investigación: Contribución a una revistaArtículo

Resumen

© 2019 The Authors The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.
Idioma originalInglés
Páginas (desde-hasta)426-431
Número de páginas6
PublicaciónPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
DOI
EstadoPublicada - 10 feb 2019
Publicado de forma externa

Áreas temáticas de ASJC Scopus

  • Física nuclear y de alta energía

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    Zhao, B., Kim, A., Joo, K., Bedlinskiy, I., Kim, W., Kubarovsky, V., Ungaro, M., Adhikari, S., Akbar, Z., Angelini, G., Avakian, H., Ball, J., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Biselli, A. S., Boiarinov, S., ... Zhao, Z. W. (2019). Measurement of the beam spin asymmetry of e→p→epη in the deep-inelastic regime with CLAS. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 426-431. https://doi.org/10.1016/j.physletb.2018.12.065