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26 April 2024

» arxiv » 1503.5435

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Determination of the Beam-Spin Asymmetry of Deuteron Photodisintegration in the Energy Region $E_gamma=1.1-2.3$ GeV
Nicholas Zachariou ; Yordanka Ilieva ; Nikolay Ya. Ivanov ; Misak M Sargsian ; Robert Avakian ; Gerald Feldman ; Pawel Nadel-Turonski ; K.P. Adhikari ; D. Adikaram ; M.D. Anderson ; S. Anefalos Pereira ; H. Avakian ; R.A. Badui ; N.A. Baltzell ; M. Battaglieri ; V. Baturin ; I. Bedlinskiy ; A.S. Biselli ; W.J. Briscoe ; W.K. Brooks ; V.D. Burkert ; T. Cao ; D.S. Carman ; A. Celentano ; S. Chandavar ; G. Charles ; L. Colaneri ; P.L. Cole ; N. Compton ; M. Contalbrigo ; O. Cortes ; V. Crede ; A. D'Angelo ; R. De Vita ; E. De Sanctis ; A. Deur ; C. Djalali ; R. Dupre ; H. Egiyan ; A. El Alaoui ; L. El Fassi ; L. Elouadrhiri ; G. Fedotov ; S. Fegan ; A. Filippi ; J.A. Fleming ; T.A. Forest ; A. Fradi ; N. Gevorgyan ; Y. Ghandilyan ; G.P. Gilfoyle ; K.L. Giovanetti ; F.X. Girod ; D.I. Glazier ; E. Golovatch ; R.W. Gothe ; K.A. Griffioen ; M. Guidal ; K. Hafidi ; C. Hanretty ; N. Harrison ; M. Hattawy ; K. Hicks ; D. Ho ; M. Holtrop ; S.M. Hughes ; D.G. Ireland ; B.S. Ishkhanov ; E.L. Isupov ; H. Jiang ; H.S. Jo ; K. Joo ; D. Keller ; G. Khachatryan ; M. Khandaker ; A. Kim ; W. Kim ; F.J. Klein ; V. Kubarovsky ; P. Lenisa ; K. Livingston ; H.Y. Lu ; I .J .D. MacGregor ; N. Markov ; P.T. Mattione ; B. McKinnon ; T. Mineeva ; M. Mirazita ; V.I. Mokeeev ; R.A. Montgomery ; H. Moutarde ; C. Munoz Camacho ; L.A. Net ; S. Niccolai ; G. Niculescu ; I. Niculescu ; M. Osipenko ; A.I. Ostrovidov ; K. Park ; E. Pasyuk ; W. Phelps ; J.J. Phillips ; S. Pisano ; O. Pogorelko ; S. Pozdniakov ; J.W. Price ; S. Procureur ; Y. Prok ; D. Protopopescu ; A.J.R. Puckett ; M. Ripani ; A. Rizzo ; G. Rosner ; P. Rossi ; P. Roy ; F. Sabatié ; C. Salgado ; D. Schott ; R.A. Schumacher ; E. Seder ; I. Senderovich ; Y.G. Sharabian ; Iu. Skorodumina ; G.D. Smith ; D.I. Sober ; D. Sokhan ; N. Sparveris ; S. Stepanyan ; S. Strauch ; V. Sytnik ; M. Taiuti ; Ye Tian ; M. Ungaro ; H. Voskanyan ; E. Voutier ; N.K. Walford ; D. Watts ; X. Wei ; M.H. Wood ; L. Zana ; J. Zhang ; Z.W. Zhao ; I. Zonta ; CLAS collaboration ;
Date:	18 Mar 2015
Abstract:	The beam-spin asymmetry, $Sigma$, for the reaction $gamma d ightarrow pn$ has been measured using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility (JLab) for six photon-energy bins between 1.1 and 2.3 GeV, and proton angles in the center-of-mass frame, $ heta_{c.m.}$, between $25^circ$ and $160^circ$. These are the first measurements of beam-spin asymmetries at $ heta_{c.m.}=90^circ$ for photon-beam energies above 1.6 GeV, and the first measurements for angles other than $ heta_{c.m.}=90^circ$. The angular and energy dependence of $Sigma$ is expected to aid in the development of QCD-based models to understand the mechanisms of deuteron photodisintegration in the transition region between hadronic and partonic degrees of freedom, where both effective field theories and perturbative QCD cannot make reliable predictions.
Source:	arXiv, 1503.5435
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