The beam-spin asymmetry, Sigma, for the reaction gamma d -> 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, theta(c.m.), between 25 degrees and 160 degrees. These are the first measurements of beam-spin asymmetries at theta(c.m.) = 90. for photon-beam energies above 1.6 GeV, and the first measurements for angles other than theta(c.m.) = 90 degrees. 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.

Zachariou, N., Ilieva, Y., Berman, B.l., Ivanov, N.y., Sargsian, M.m., Avakian, R., et al. (2015). Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy region Eγ=1.1 -2.3 GeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 91(5) [10.1103/PhysRevC.91.055202].

Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy region Eγ=1.1 -2.3 GeV

COLANERI, LUCA;D'ANGELO, ANNALISA;PISANO, SILVIA;RIZZO, ALESSANDRO;ZONTA, IRENE
2015-05-13

Abstract

The beam-spin asymmetry, Sigma, for the reaction gamma d -> 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, theta(c.m.), between 25 degrees and 160 degrees. These are the first measurements of beam-spin asymmetries at theta(c.m.) = 90. for photon-beam energies above 1.6 GeV, and the first measurements for angles other than theta(c.m.) = 90 degrees. 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.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - Fisica Nucleare e Subnucleare
English
Con Impact Factor ISI
LINEARLY POLARIZED PHOTONS; PROTON ELASTIC-SCATTERING; 2-BODY PHOTODISINTEGRATION; CROSS-SECTION; HARD PHOTODISINTEGRATION; QUANTUM CHROMODYNAMICS; STRING MODEL; CLAS; PHOTOPRODUCTION; DISINTEGRATION
CLAS Collaboration
http://journals.aps.org/prc/pdf/10.1103/PhysRevC.91.055202
Zachariou, N., Ilieva, Y., Berman, B.l., Ivanov, N.y., Sargsian, M.m., Avakian, R., et al. (2015). Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy region Eγ=1.1 -2.3 GeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 91(5) [10.1103/PhysRevC.91.055202].
Zachariou, N; Ilieva, Y; Berman, B; Ivanov, N; Sargsian, M; Avakian, R; Feldman, G; Nadel Turonski, P; Adhikari, K; Adikaram, D; Anderson, M; Pereira, S; Avakian, H; Badui, R; Baltzell, N; Battaglieri, M; Baturin, V; Bedlinskiy, I; Biselli, A; Briscoe, W; Brooks, W; Burkert, V; Cao, T; Carman, D; Celentano, A; Chandavar, S; Charles, G; Colaneri, L; Cole, P; Compton, N; Contalbrigo, M; Cortes, O; Crede, V; D'Angelo, A; De Vita, R; De Sanctis, E; Deur, A; Djalali, C; Dupre, R; Egiyan, H; Alaoui, A; Fassi, L; Elouadrhiri, L; Fedotov, G; Fegan, S; Filippi, A; Fleming, J; Forest, T; Fradi, A; Gevorgyan, N; Ghandilyan, Y; Gilfoyle, G; Giovanetti, K; Girod, F; Glazier, D; Golovatch, E; Gothe, R; Griffioen, K; Guidal, M; Hafidi, K; Hanretty, C; Harrison, N; Hattawy, M; Hicks, K; Ho, D; Holtrop, M; Hughes, S; Ireland, D; Ishkhanov, B; Isupov, E; Jiang, H; Jo, H; Joo, K; Keller, D; Khachatryan, G; Khandaker, M; Kim, A; Kim, W; Klein, F; Kubarovsky, V; Lenisa, P; Livingston, K; Lu, H; Macgregor, I; Markov, N; Mattione, P; Mckinnon, B; Mineeva, T; Mirazita, M; Mokeeev, V; Montgomery, R; Moutarde, H; Camacho, C; Net, L; Niccolai, S; Niculescu, G; Niculescu, I; Osipenko, M; Ostrovidov, A; Park, K; Pasyuk, E; Phelps, W; Phillips, J; Pisano, S; Pogorelko, O; Pozdniakov, S; Price, J; Procureur, S; Prok, Y; Protopopescu, D; Puckett, A; Ripani, M; Rizzo, A; Rosner, G; Rossi, P; Roy, P; Sabatie, F; Salgado, C; Schott, D; Schumacher, R; Seder, E; Senderovich, I; Sharabian, Y; Skorodumina, I; Smith, G; Sober, D; Sokhan, D; Sparveris, N; Stepanyan, S; Strauch, S; Sytnik, V; Taiuti, M; Tian, Y; Ungaro, M; Voskanyan, H; Voutier, E; Walford, N; Watts, D; Wei, X; Wood, M; Zana, L; Zhang, J; Zhao, Z; Zonta, I
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/173661
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