Compton scattering by the proton through θcms = 75° in the Δ-resonance region

Peise, J.; Hünger, A.; Ahrens, J.; Anthony, I.; Arends, H. J.; Beck, R.; Capitani, G. P.; Dolbilkin, B.S.; Falkenberg, H.; Hall, S.J.; Jennewein, P.; Kellie, J. D.; Kondratjev, R.; Kordsmeier, R.; Lisin, V.; L’vov, A. I.; Miller, G.J.; Molinari, C.; Reolon, A. R.; Robbiano, A.; Sanzone, M.; Schmitz, M.; Schneider, M.; Schumacher, M.; Selke, O.; Walcher, Th.; Wissmann, F.

doi:10.1016/0370-2693(96)00709-5

Cited by 30 publications

(28 citation statements)

References 22 publications

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“…This is also seen in Fig. 14 at two fixed angles, now as function of the energy throughout the ∆ resonance region, for the MAMI data at 75 o [7] and 90 o [6]. It is again obvious at these angles that the sensitivity to γ π is quite small.…”

Section: Resultsmentioning

confidence: 54%

“…The physics of the ∆(1232) and higher resonances has been the objective of further recent investigations with tagged photons at Mainz [6,7] and with laser-backscattered photons at Brookhaven [8]. The measured differential cross sections and polarization asymmetries helped to discard a long-standing problem, a unitarity violation reported in earlier experiments, and provided useful cross-checks for the magnetic dipole and electric quadrupole excitation of the ∆ resonance.…”

Section: Introductionmentioning

confidence: 99%

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Fixed-tsubtracted dispersion relations for Compton scattering off the nucleon

et al. 1999

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We present fixed-t subtracted dispersion relations for Compton scattering off the nucleon at energies E γ ≤ 500 MeV, as a formalism to extract the nucleon polarizabilities with a minimum of model dependence. The subtracted dispersion integrals are mainly saturated by πN intermediate states in the s-channel γN → πN → γN and ππ intermediate states in the t-channel γγ → ππ → NN . For the subprocess γγ → ππ, we construct a unitarized amplitude and find a good description of the available data. We show results for Compton scattering using the subtracted dispersion relations and display the sensitivity on the scalar polarizability difference α − β and the backward spin polarizability γ π , which enter directly as fit parameters in the present formalism.

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Section: Resultsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Fixed-tsubtracted dispersion relations for Compton scattering off the nucleon

et al. 1999

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“…Compton scattering on the proton at low and intermediate energies has thus far been studied mainly with unpolarized photons. Many recent data are available on the unpolarized differential cross section both in the region below pion threshold [1][2][3] and in the Delta region [4][5][6][7][8]. They have led to a determination of the dipole electric and magnetic polarizabilities of the proton, have given useful constraints on pion photoproduction amplitudes near the Delta peak, and have provided sensitive tests for different models of Compton scattering, such as those based on resonance saturation [9][10][11][12], chiral perturbation theory [13,14], and dispersion relations [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Low-energy Compton scattering of polarized photons on polarized nucleons

et al. 1998

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The general structure of the cross section of γN scattering with polarized photon and/or nucleon in initial and/or final state is systematically described and exposed through invariant amplitudes. A low-energy expansion of the cross section up to and including the order O(ω 4 ) is given which involves ten structure parameters of the nucleon (dipole, quadrupole, dispersion, and spin polarizabilities). Their physical meaning is discussed in detail.Using fixed-t dispersion relations, predictions for these parameters are obtained and compared with results of chiral perturbation theory. It is emphasized that Compton scattering experiments at large angles can fix the most uncertain of these structure parameters. Predictions for the cross section and double-polarization asymmetries are given and the convergence of the expansion is investigated. The feasibility of the experimental determination of some of the structure parameters is discussed.

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“…A sample of the high energy data from LEGS, Mainz and SAL is shown in Figure 1 ;;EJ, c-) Table 3: Results of fits to Compton data up to 27r threshold [13,15,16,7] using different (~,z) multiples from [2,25,14]. In all cases, & -~is iixed at 10 and 6 +~to 13.7 (10-4 fm3).…”

Section: -350mentioning

confidence: 99%

“…We have used the same set of (7, n) data as in [13], and have included the Compton data from LEGS [13], Mainz [15,16], SAL . [7,8], the Max Plank Institute (MPI) [6], Illinois (Ill) [5], and MOSCOW [4].…”

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confidence: 99%