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Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction | | W.B. Li
; G.M. Huber
; H.P. Blok
; D. Gaskell
; T. Horn
; K. Semenov-Tian-Shansky
; B. Pire
; L. Szymanowski
; J.-M. Laget
; K. Aniol
; J. Arrington
; E.J. Beise
; W. Boeglin
; E.J. Brash
; H. Breuer
; C.C. Chang
; M.E. Christy
; R. Ent
; E.F. Gibson
; R.J. Holt
; S. Jin
; M.K. Jones
; C.E. Keppel
; W. Kim
; P.M. King
; V. Kovaltchouk
; J. Liu
; G.J. Lolos
; D.J. Mack
; D.J. Margaziotis
; P. Markowitz
; A. Matsumura
; D. Meekins
; T. Miyoshi
; H. Mkrtchyan
; I. Niculescu
; Y. Okayasu
; L. Pentchev
; C. Perdrisat
; D. Potterveld
; V. Punjabi
; P.E. Reimer
; J. Reinhold
; J. Roche
; P.G. Roos
; A. Sarty
; Smith
; V. Tadevosyan
; L.G. Tang
; V. Tvaskis
; J. Volmer
; W. Vulcan
; G. Warren
; S.A. Wood
; C. Xu
; X. Zheng
; | | Date: |
1 Oct 2019 | | Abstract: | 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 omega electroproduction off the proton, e + p
-> e’ + p + omega, at central Q^2 values of 1.60, 2.45 GeV^2 , at W = 2.21 GeV.
The results of our pioneering -u ~ -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
GeV^2 , 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 (TDAs): universal
non-perturbative objects only accessible through backward angle kinematics. | | Source: | arXiv, 1910.0464 | | Services: | Forum | Review | PDF | Favorites | |
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