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# Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of $Q^2$ = 1.0 $GeV^2$

Abstract : We have made the first measurements of the virtual Compton scattering process via the e p -> e p gamma exclusive reaction at Q**2 = 1 GeV**2 in the nucleon resonance region. The cross section is obtained at center of mass (CM) backward angle, theta_gamma_gamma*, in a range of total (gamma* p) CM energy W from the proton mass up to W = 1.91 GeV. The data show resonant structures in the first and second resonance regions, and are well reproduced at higher W by the Bethe-Heitler+Born cross section, including t-channel pi0-exchange. At high W, our data, together with existing real photon data, show a striking Q**2 independence. Our measurement of the ratio of H(e,e'p)gamma to H(e,e'p)pi0 cross sections is presented and compared to model predictions.

http://hal.in2p3.fr/in2p3-00021754
Soumis le : mercredi 5 mai 2004 - 16:25:23
Dernière modification le : mardi 19 mai 2020 - 09:14:12

### Citation

G. Laveissiere, N. Degrande, S. Jaminion, C. Jutier, L. Todor, et al.. Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of $Q^2$ = 1.0 $GeV^2$. Physical Review C, American Physical Society, 2009, 79, pp.015201. ⟨10.1103/PhysRevC.79.015201⟩. ⟨in2p3-00021754⟩

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