Abstract.
Wide-angle Compton scattering (WACS) is discussed within the handbag approach in which the amplitudes are given by products of hard subprocess amplitudes and form factors, specific to Compton scattering, which represent 1/x -moments of generalized parton distributions (GPDs). The quality of our present knowledge of these form factors and of the underlying GPDs is examined. As will be discussed in some detail the form factor \( R_A\) and the underlying GPD ˜ are poorly known. It is argued that future data on the spin correlations \( A_{LL}\) and/or \( K_{LL}\) will allow for an extraction of \( R_A\) which can be used to constrain the large - t behavior of ˜ .
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References
A.V. Radyushkin, Phys. Rev. D 56, 5524 (1997)
X.D. Ji, J. Osborne, Phys. Rev. D 58, 094018 (1998)
J.C. Collins, A. Freund, Phys. Rev. D 59, 074009 (1999)
A.V. Radyushkin, Phys. Rev. D 58, 114008 (1998)
M. Diehl, T. Feldmann, R. Jakob, P. Kroll, Eur. Phys. J. C 8, 409 (1999)
S.V. Goloskokov, P. Kroll, Eur. Phys. J. C 50, 829 (2007)
K. Kumericki, T. Lautenschlager, D. Mueller, K. Passek-Kumericki, A. Schaefer, M. Meskauskas, arXiv:1105.0899 [hep-ph]
H.W. Huang, P. Kroll, Eur. Phys. J. C 17, 423 (2000)
S.V. Goloskokov, P. Kroll, Eur. Phys. J. C 65, 137 (2010)
S.V. Goloskokov, P. Kroll, Eur. Phys. J. A 47, 112 (2011)
G.R. Goldstein, J.O. Gonzalez Hernandez, S. Liuti, Phys. Rev. D 91, 114013 (2015)
CLAS Collaboration (I. Bedlinskiy et al.), Phys. Rev. C 90, 025205 (2014) 90
Jefferson Lab Hall A Collaboration (M. Defurne et al.), Phys. Rev. Lett. 117, 262001 (2016)
H.W. Huang, R. Jakob, P. Kroll, K. Passek-Kumericki, Eur. Phys. J. C 33, 91 (2004)
M. Diehl, P. Kroll, Eur. Phys. J. C 73, 2397 (2013)
H.W. Huang, P. Kroll, T. Morii, Eur. Phys. J. C 23, 301 (2002) 31
M. Diehl, T. Feldmann, R. Jakob, P. Kroll, Eur. Phys. J. C 39, 1 (2005)
M. Diehl, T. Feldmann, H.W. Huang, P. Kroll, Phys. Rev. D 67, 037502 (2003)
M. Diehl, Eur. Phys. J. C 19, 485 (2001)
H. Rollnik, P. Stichel, in Elementary Particle Physics, edited by E. Paul, Springer Tracts, Vol. 79 (Springer, Berlin, 1976)
C. Bourrely, J. Soffer, E. Leader, Phys. Rep. 59, 95 (1980)
S. Alekhin, J. Blumlein, S. Moch, Phys. Rev. D 86, 054009 (2012)
T. Kitagaki et al., Phys. Rev. D 28, 436 (1983)
D. de Florian, R. Sassot, M. Stratmann, W. Vogelsang, Phys. Rev. D 80, 034030 (2009)
M. Burkardt, Int. J. Mod. Phys. A 18, 173 (2003)
Jefferson Lab Hall A Collaboration (D.J. Hamilton et al.), Phys. Rev. Lett. 94, 242001 (2005)
C. Fanelli et al., Phys. Rev. Lett. 115, 152001 (2015)
S.K. Dagaonkar, P. Jain, J.P. Ralston, Eur. Phys. J. C 74, 3000 (2014)
S.D. Drell, T.M. Yan, Phys. Rev. Lett. 24, 181 (1970)
S.J. Brodsky, M. Burkardt, I. Schmidt, Nucl. Phys. B 441, 197 (1995)
G.A. Miller, Phys. Rev. C 69, 052201 (2004)
Hall A Collaboration (A. Danagoulian et al.), Phys. Rev. Lett. 98, 152001 (2007)
D. Babusci, G. Giordano, A.I. L'vov, G. Matone, A.M. Nathan, Phys. Rev. C 58, 1013 (1998)
D.J. Quinn, J.P. Rutherfoord, M.A. Shupe, D. Sherden, R. Siemann, C.K. Sinclair, Phys. Rev. D 20, 1553 (1979)
N. Kivel, M. Vanderhaeghen, Eur. Phys. J. C 75, 483 (2015)
S. Dagaonkar, arXiv:1611.00147 [hep-ph]
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Kroll, P. The GPD H̃ and spin correlations in wide-angle Compton scattering. Eur. Phys. J. A 53, 130 (2017). https://doi.org/10.1140/epja/i2017-12326-2
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DOI: https://doi.org/10.1140/epja/i2017-12326-2