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26 April 2024

» arxiv » 1506.4045

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Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton
C. Fanelli ; E. Cisbani ; D. J. Hamilton ; G. Salme ; B. Wojtsekhowski ; A. Ahmidouch ; J. R. M. Annand ; H. Baghdasaryan ; J. Beaufait ; P. Bosted ; E. J. Brash ; C. Butuceanu ; P. Carter ; E. Christy ; E. Chudakov ; S. Danagoulian ; D. Day ; P. Degtyarenko ; R. Ent ; H. Fenker ; M. Fowler ; E. Frlez ; D. Gaskell ; R. Gilman ; T. Horn ; G. M. Huber ; C. W. de Jager ; E. Jensen ; M. K. Jones ; A. Kelleher ; C. Keppel ; M. Khandaker ; M. Kohl ; G. Kumbartzki ; S. Lassiter ; Y. Li ; R. Lindgren ; H. Lovelace ; W. Luo ; D. Mack ; V. Mamyan ; D. J. Margaziotis ; P. Markowitz ; J. Maxwell ; G. Mbianda ; D. Meekins ; M. Meziane ; J. Miller ; A. Mkrtchyan ; H. Mkrtchyan ; J. Mulholland ; V. Nelyubin ; L. Pentchev ; C. F. Perdrisat ; E. Piasetzky ; Y. Prok ; A. J. R. Puckett ; V. Punjabi ; M. Shabestari ; A. Shahinyan ; K. Slifer ; G. Smith ; P. Solvignon ; R. Subedi ; F. R. Wesselmann ; S. Wood ; Z. Ye ; X. Zheng ;
Date:	12 Jun 2015
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 WACS polarization transfer was analyzed at an incident photon energy of 3.7 GeV at a proton scattering angle of cma$= 70^circ$. The longitudinal transfer KLL, measured to be $0.645 pm 0.059 pm 0.048$, 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 $sim$3 times larger than predicted by the GPD-based calculations, which indicates a significant unknown contribution to the scattering amplitude.
Source:	arXiv, 1506.4045
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