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Title: Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton

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 WACS polarization transfer was analyzed at an incident photon energy of 3.7 GeV at a proton scattering angle of θ P cm = 70°. The longitudinal transfer K LL, 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 GPD-based calculations, which indicates a significant unknown contribution to the scattering amplitude.
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Publication Date:
Report Number(s):
JLAB-PHY-15-2059; DOE/OR/23177-3372; arXiv:1506.04045
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC05-84ER40150
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
Jefferson Lab Hall C Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1226145
Alternate Identifier(s):
OSTI ID: 1223139

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.. Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton. United States: N. p., Web. doi:10.1103/PhysRevLett.115.152001.
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., & Zheng, X.. Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton. United States. doi:10.1103/PhysRevLett.115.152001.
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.. 2015. "Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton". United States. doi:10.1103/PhysRevLett.115.152001. https://www.osti.gov/servlets/purl/1226145.
@article{osti_1226145,
title = {Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton},
author = {Fanelli, C. and Cisbani, E. and Hamilton, D. J. and Salmé, G. and Wojtsekhowski, B. and Ahmidouch, A. and Annand, J. R. M. and Baghdasaryan, H. and Beaufait, J. and Bosted, P. and Brash, E. J. and Butuceanu, C. and Carter, P. and Christy, E. and Chudakov, E. and Danagoulian, S. and Day, D. and Degtyarenko, P. and Ent, R. and Fenker, H. and Fowler, M. and Frlez, E. and Gaskell, D. and Gilman, R. and Horn, T. and Huber, G. M. and de Jager, C. W. and Jensen, E. and Jones, M. K. and Kelleher, A. and Keppel, C. and Khandaker, M. and Kohl, M. and Kumbartzki, G. and Lassiter, S. and Li, Y. and Lindgren, R. and Lovelace, H. and Luo, W. and Mack, D. and Mamyan, V. and Margaziotis, D. J. and Markowitz, P. and Maxwell, J. and Mbianda, G. and Meekins, D. and Meziane, M. and Miller, J. and Mkrtchyan, A. and Mkrtchyan, H. and Mulholland, J. and Nelyubin, V. and Pentchev, L. and Perdrisat, C. F. and Piasetzky, E. and Prok, Y. and Puckett, A. J. R. and Punjabi, V. and Shabestari, M. and Shahinyan, A. and Slifer, K. and Smith, G. and Solvignon, P. and Subedi, R. and Wesselmann, F. R. and Wood, S. and Ye, Z. and Zheng, X.},
abstractNote = {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 WACS 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 GPD-based calculations, which indicates a significant unknown contribution to the scattering amplitude.},
doi = {10.1103/PhysRevLett.115.152001},
journal = {Physical Review Letters},
number = 15,
volume = 115,
place = {United States},
year = {2015},
month = {10}
}