Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.182501
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Funding
- NSERC (Canada) [FRN: SPAPIN-2016-00031]
- DOE
- NSF (U.S.)
- FOM (Netherlands)
- NRF (Republic of Korea)
- Jefferson Science Associates
- University of Regina
- U.S. Department of Energy [DE-AC05-06OR23177, DE-AC02-06CH11357]
- National Science Center in Poland [2017/26/M/ST2/01074]
- French Laboratories of Excellence (LABEX) P2IO
- French Groupement de Recherche Chromodynamique Quantique et Physique des Hadrons (GDR QCD)
- North Atlantic Treaty Organization (NATO)
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Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this Letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive. electroproduction off the proton, ep -> e'p omega, at central Q(2) values of 1.60, 2.45 GeV2, at W = 2.21 GeV. The results of our pioneering -u approximate to-u(min) study demonstrate the existence of a unanticipated backward-angle cross section peak and the feasibility of full L/T/LT/TT separations in this never explored kinematic territory. At Q(2) = 2.45 GeV2, the observed dominance of sigma(T) over sigma(L), is qualitatively consistent with the collinear QCD description in the near-backward regime, in which the scattering amplitude factorizes into a hard subprocess amplitude and baryon to meson transition distribution amplitudes: universal nonperturbative objects only accessible through backward-angle kinematics.
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