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Target and double spin asymmetries of deeply virtual π<sup>0</sup> production with a longitudinally polarized proton target and CLAS
Kim, A Avakian, H Burkert, V Joo, K Kim, W Adhikari, KP Akbar, Z Anefalos Pereira, S Badui, RA Battaglieri, M
Kim, A
Avakian, H
Burkert, V
Joo, K
Kim, W
Adhikari, KP
Akbar, Z
Anefalos Pereira, S
Badui, RA
Battaglieri, M
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Journal Article
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2017-05-10
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10.1016/j.physletb.2017.02.032
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© 2017 The Author(s) The target and double spin asymmetries of the exclusive pseudoscalar channel e→p→→epπ0 were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of Q2, xB, −t and ϕ. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs H˜T and ET, and complement previous measurements of unpolarized structure functions sensitive to the GPDs HT and E¯T. These data provide a crucial input for parametrizations of essentially unknown chiral-odd GPDs and will strongly influence existing theoretical calculations based on the handbag formalism.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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