Political readings of Scripture

Gorringe, Tim; Barton, John

doi:10.1017/ccol0521481449.006

Cited by 4 publications

(3 citation statements)

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“…The current empirical information on the RCS polarizabilities is summarized in Table IX. New experiments are presently beeing performed [111] or in preparation [112].…”

Section: Generalized Polarizabilities Of Pionsmentioning

confidence: 99%

Virtual Compton scattering off the nucleon at low energies

1996

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We investigate the low-energy behavior of the four-point Green's function ⌫ describing virtual Compton scattering off the nucleon. Using Lorentz invariance, gauge invariance, and crossing symmetry, we derive the leading terms of an expansion of the operator in the four-momenta q and qЈ of the initial and final photon, respectively. The model-independent result is expressed in terms of the electromagnetic form factors of the free nucleon, i.e., on-shell information which one obtains from electron-nucleon scattering experiments. Modeldependent terms appear in the operator at O(q ␣ q ␤ Ј ), whereas the orders O(q ␣ q ␤ ) and O(q ␣ Ј q ␤ Ј ) are contained in the low-energy theorem for ⌫ , i.e., no new parameters appear. We discuss the leading terms of the matrix element and comment on the use of on-shell equivalent electromagnetic vertices in the calculation of ''Born terms'' for virtual Compton scattering. ͓S0556-2813͑96͒02108-5͔

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“…The current empirical information on the RCS polarizabilities is summarized in Table IX. New experiments are presently beeing performed [111] or in preparation [112].…”

Section: Generalized Polarizabilities Of Pionsmentioning

confidence: 99%

Virtual Compton scattering off the nucleon at low energies

1996

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“…As can be seen, the results scatter substantially and have large uncertainties, and therefore, more experimental efforts are evidently needed. A new radiative pion photoproduction experiment at the Mainz Microtron MAMI has recently taken data [7], another one has been proposed at Jefferson Lab [8], an experiment investigating the inverse reaction π − p → nγγ has been proposed at TRIUMF [9], a new γγ → ππ experiment was proposed at Frascati [10], and new Primakoff (bremsstrahlung) experiments were proposed at CERN COMPASS [11].…”

Section: Introductionmentioning

confidence: 99%

Pion generalized dipole polarizabilities by virtual Compton scatteringπe→πeγ

et al. 2001

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We present a calculation of the cross section and the event generator of the reaction πe → πeγ. This reaction is sensitive to the pion generalized dipole polarizabilities, namely, the longitudinal electric α L (q 2 ), the transverse electric α T (q 2 ), and the magnetic β(q 2 ) which, in the real-photon limit, reduce to the ordinary electric and magnetic polarizabilitiesᾱ andβ, respectively. The calculation of the cross section is done in the framework of chiral perturbation theory at O(p 4 ). A pion VCS event generator has been written which is ready for implementation in GEANT simulation codes or for independent use. 13.60.Fz,14.40.Aq

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“…Corrections to the leading-order PCAC result have been calculated at O(p 6 ) in chiral perturbation theory and turn out to be be rather small [13]. New experiments are presently being carried out [14] or have been proposed [15,16] to significantly reduce the uncertainties in the empirical results and thus subject the predictions of chiral symmetry to a stringent test.…”

Section: Introductionmentioning

confidence: 99%