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25 April 2024 |
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Backward-angle Exclusive pi0 Production above the Resonance Region | | W.B. Li
; G.M. Huber
; J.R. Stevens
; K. Semenov-Tian-Shansky
; L. Szymanowski
; B. Pire
; M. Amaryan
; D. Androic
; K. Aniol
; D. Armstrong
; T. Averett
; C. Ayerbe Gayoso
; W. Boeglin
; M. Boer
; A. Camsonne
; J. Chen
; S. Covrig Dusa
; W. Deconinck
; M. Defurne
; F. Delcarro
; M. Diefenthaler
; S. Diehl
; M. Elaasar
; C. Fanelli
; S. Fegan
; E. Fuchey
; D. Gaskell
; O. Hansen
; F. Hauenstein
; D. Higinbotham
; A. Hiller Blin
; A. Hurley
; C. Hyde
; K. Joo
; M. Junaid
; N. Kalantarians
; S. Kay
; M. Khachatryan
; P. King
; V. Kumar
; D. Lersch
; L. Lorenti
; P. Markowitz
; M. McCaughan
; A. Mkrtchyan
; H. Mkrtchyan
; G. Niculescu
; I. Niculescu
; Z. Papandreou
; R. Paremuzyan
; K. Park
; D. Paudyal
; J. Roche
; A. Rodas
; B. Sawatzky
; A. Schertz
; G. Smith
; I. Strakovsky
; V. Tadevosyan
; A. Usman
; H. Voskanyan
; C. Yero
; | | Date: |
25 Aug 2020 | | Abstract: | The proposed measurement is a dedicated study of the exclusive
electroproduction process,1H(e,e’p)pi0, in the backward-angle regime (u-channel
process) above the resonance region. The produced pi0 is emitted 180 degrees
opposite to the virtual-photon momentum. This study also aims to apply the
well-known Rosenbluth separation technique that provides the model-independent
differential cross-sections at the never explored u-channel kinematics region.
Currently, the "soft-hard transition" in u-channel meson production remains an
interesting and unexplored subject. The available theoretical frameworks offer
competing interpretations for the observed backward-angle cross section peaks.
In a "soft" hadronic Regge exchange description, the backward meson production
comes from the interference between nucleon exchange and the meson produced via
re-scattering within the nucleon. Whereas in the "hard" GPD-like backward
collinear factorization regime, the scattering amplitude factorizes into a hard
subprocess amplitude and baryon to meson transition distribution amplitudes
(TDAs), otherwise known as super skewed parton distributions (SuperSPDs). Both
TDAs and SPDs are universal non-perturbative objects of nucleon structure
accessible only through backward-angle kinematics. The separated cross
sections:sigma_T,sigma_L and T/L ratio at Q2=2-6 GeV2, provide a direct test of
two predictions from the TDA model. The magnitude and u-dependence of the
separated cross sections also provide a direct connection to the re-scattering
Regge picture. The extracted interaction radius (from u-dependence) at
different Q2 can be used to study the soft-hard transition in the u-channel
kinematics. The acquisition of these data will be an important step forward in
validating the existence of a backward factorization scheme of the nucleon
structure function and establishing its applicable kinematic range. | | Source: | arXiv, 2008.10768 | | Services: | Forum | Review | PDF | Favorites | |
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