Experimental study of Compton scattering on protons by polarized photons in the energy range E_gamma=0.5-1.0 GeV

Abstract

AbsbacL An experimental sNdy of Canpton scanering 00 pmtons by Linearly polarized photons has been carried out m the kinematical m g e E , = 0.5-1.0 CcV and 6' ; . = 85-125". Results oblained on Ihe a s s -s e c t i o n asymmetry X are cmpared wilh the various model predidim.

Vector meson production and nucleon resonance analysis in a coupled-channel approach for energiesmN<s<2Penner1, Mosel2 2002Phys. Rev. C16013860View full textAdd to dashboardCite

“…[5], the differential cross sections and beam-polarization data of Ref. [28] are implemented. Since the spin-5 2 resonances D 15 (1675) and F 15 (1680) are known to have large photon couplings [29], it is certain, that for higher energies their contributions will be important.…”

“…As a consequence of the new data from Ref. [28] we have doubled the Compton scattering data base from 266 to 538 data points as compared to Ref. [5].…”

Photoproduction of electron-positron pairs on the proton in the resonance region

“…Similar disagreement was noticed in [35] -it may point to the importance of analiticity constraints in the calculation of the Compton amplitude. The data [43] for the photon asymmetry at θ γ = 90 • and energy E lab γ ≥ 500 MeV are not reproduced by the calculation with the set "A". The description improves with the set "B" (dashed lines) though both parameter sets give very close results for cross sections (top panels).…”

“…)[41]. Data for photon asymmetry: • LEGS Collaboration[42], • Erevan[43]; and for proton polarization:• Tokyo[44].…”

Photoproduction of electron–positron pairs on the proton in the resonance region

“…Similar disagreement was noticed in [35] -it may point to the importance of analiticity constraints in the calculation of the Compton amplitude. The data [43] for the photon asymmetry at θ γ = 90…”