학술논문
Measurement of the beam spin asymmetry of e→p→e′p′η in the deep-inelastic regime with CLAS
Document Type
article
Author
B. Zhao; A. Kim; K. Joo; I. Bedlinskiy; W. Kim; V. Kubarovsky; M. Ungaro; S. Adhikari; Z. Akbar; G. Angelini; H. Avakian; J. Ball; N.A. Baltzell; L. Barion; M. Bashkanov; M. Battaglieri; V. Batourine; A.S. Biselli; S. Boiarinov; W.J. Briscoe; W.K. Brooks; V.D. Burkert; D.S. Carman; A. Celentano; P. Chatagnon; T. Chetry; G. Ciullo; L. Clark; B.A. Clary; P.L. Cole; M. Contalbrigo; V. Crede; A. D'Angelo; N. Dashyan; R. De Vita; E. De Sanctis; M. Defurne; A. Deur; S. Diehl; C. Djalali; R. Dupre; H. Egiyan; M. Ehrhart; A. El Alaoui; L. El Fassi; P. Eugenio; A. Filippi; T.A. Forest; G. Gavalian; Y. Ghandilyan; G.P. Gilfoyle; F.X. Girod; E. Golovatch; R.W. Gothe; K.A. Griffioen; M. Guidal; L. Guo; K. Hafidi; H. Hakobyan; N. Harrison; M. Hattawy; D. Heddle; K. Hicks; M. Holtrop; Y. Ilieva; D.G. Ireland; B.S. Ishkhanov; E.L. Isupov; D. Jenkins; H.S. Jo; S. Johnston; M.L. Kabir; D. Keller; G. Khachatryan; M. Khachatryan; M. Khandaker; A. Klein; F.J. Klein; S.E. Kuhn; S.V. Kuleshov; L. Lanza; P. Lenisa; K. Livingston; I.J.D. MacGregor; D. Marchand; N. Markov; B. McKinnon; C.A. Meyer; Z.E. Meziani; M. Mirazita; V. Mokeev; R.A. Montgomery; C. Munoz Camacho; P. Nadel-Turonski; S. Niccolai; G. Niculescu; M. Osipenko; A.I. Ostrovidov; M. Paolone; R. Paremuzyan; K. Park; O. Pogorelko; J.W. Price; Y. Prok; D. Protopopescu; M. Ripani; A. Rizzo; G. Rosner; P. Rossi; F. Sabatié; C. Salgado; R.A. Schumacher; Y.G. Sharabian; Iu. Skorodumina; G.D. Smith; D. Sokhan; N. Sparveris; S. Stepanyan; I.I. Strakovsky; S. Strauch; M. Taiuti; J.A. Tan; H. Voskanyan; E. Voutier; R. Wang; X. Wei; M.H. Wood; N. Zachariou; J. Zhang; Z.W. Zhao
Source
Physics Letters B, Vol 789, Iss , Pp 426-431 (2019)
Subject
Language
English
ISSN
0370-2693
Abstract
The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sinϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations. Keywords: Nucleon structure, CLAS collaboration, Deeply Virtual Meson Production, Chiral-odd generalized parton distributions