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Helicity dependence and contribution to the Gerasimov-Drell-Hearn sum rule of the γ→d→→πNN reaction channels in the energy region from threshold up to the Δ(1232) resonance

AuthorsDarwish, E.M.; Fernández-Ramírez, César CSIC; Moya de Guerra, Elvira ORCID; Udías, J. M.
Issue Date15-Oct-2007
PublisherAmerican Physical Society
CitationPhysical Review C - Nuclear Physics 76: 044005 (2007)
AbstractThe helicity dependence of the γ→d→→π-pp, γ→d→→π+nn, and γ→d→→π0np reaction channels is studied for incident photon energies from threshold up to the Δ(1232) resonance with inclusion of leading πNN effects. The doubly polarized total and differential cross sections for parallel and antiparallel helicity states are predicted. Then the contribution of various channels to the deuteron spin asymmetry and the double polarization E asymmetry is calculated. In addition, the contribution to the Gerasimov-Drell-Hearn (GDH) integral from separate channels is evaluated by explicit integration up to a photon lab energy of 350 MeV. Sizeable effects from final-state interactions, specially for π0 production, are found. The sensitivity of the results to the elementary pion photoproduction operator is also investigated. Considerable dependence of the results on the elementary amplitude is found. We expect that these results may be useful to interpret the recent measurements from LEGS@BNL, A2, and GDH@MAMI Collaborations. © 2007 The American Physical Society.
Description13 págs.; 13 figs.; 2 tabs. ; PACS number(s): 13.60.Le, 25.20.Lj, 14.20.−c, 29.27.Hj
Publisher version (URL)https://doi.org/10.1103/PhysRevC.76.044005
Identifiersdoi: 10.1103/PhysRevC.76.044005
issn: 0556-2813
Appears in Collections:(CFMAC-IEM) Artículos
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