Fanelli, C. et al. (2015) Polarization transfer in wide-angle Compton scattering and single-pion photoproduction from the proton. Physical Review Letters, 115(15), 152001. (doi: 10.1103/PhysRevLett.115.152001) (PMID:26550716)
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Abstract
Wide-angle exclusive Compton scattering and single-pion photoproduction from the proton have been investigated via measurement of the polarization transfer from a circularly polarized photon beam to the recoil proton. The wide-angle Compton scattering polarization transfer was analyzed at an incident photon energy of 3.7 GeV at a proton scattering angle of θpcm=70°. The longitudinal transfer KLL, measured to be 0.645±0.059±0.048, where the first error is statistical and the second is systematic, has the same sign as predicted for the reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton. However, the observed value is ∼3 times larger than predicted by the generalized-parton-distribution-based calculations, which indicates a significant unknown contribution to the scattering amplitude.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Annand, Dr John and Hamilton, Dr David |
| Authors: | Fanelli, C., Cisbani, E., Hamilton, D.J., Salmé, G., Wojtsekhowski, B., Ahmidouch, A., Annand, J. R. M., Baghdasaryan, H., Beaufait, J., Bosted, P., Brash, E. J., Butuceanu, C., Carter, P., Christy, E., Chudakov, E., Danagoulian, S., Day, D., Degtyarenko, P., Ent, R., Fenker, H., Fowler, M., Frlez, E., Gaskell, D., Gilman, R., Horn, T., Huber, G. M., de Jager, C. W., Jensen, E., Jones, M. K., Kelleher, A., Keppel, C., Khandaker, M., Kohl, M., Kumbartzki, G., Lassiter, S., Li, Y., Lindgren, R., Lovelace, H., Luo, W., Mack, D., Mamyan, V., Margaziotis, D. J., Markowitz, P., Maxwell, J., Mbianda, G., Meekins, D., Meziane, M., Miller, J., Mkrtchyan, A., Mkrtchyan, H., Mulholland, J., Nelyubin, V., Pentchev, L., Perdrisat, C. F., Piasetzky, E., Prok, Y., Puckett, A. J. R., Punjabi, V., Shabestari, M., Shahinyan, A., Slifer, K., Smith, G., Solvignon, P., Subedi, R., Wesselmann, F. R., Wood, S., Ye, Z., and Zheng, X. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review Letters |
| Publisher: | American Physical Society |
| ISSN: | 0031-9007 |
| ISSN (Online): | 1079-7114 |
| Copyright Holders: | Copyright © 2015 American Physical Society |
| First Published: | First published in Physical Review Letters 115(15):152001 |
| Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher. |
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