Coulomb production

Fäldt, Göran; Julius, D.I.; Pilkuhn, H.; Müllensiefen, A.

doi:10.1016/0550-3213(72)90424-5

Cited by 24 publications

(4 citation statements)

References 27 publications

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“…The nuclear form factor F A (q 2t , q 2l ) in ( 1) can be estimated in the same approximation as in paper [14] since the amplitude of Coulomb photoproduction on a single proton at small q 2t is -upon evaluating (2) -proportional to q 2t :…”

Section: Coulomb Photoproductionmentioning

confidence: 99%

“…In the approach of paper [14] the nucleus is treated as a completely absorbing sphere, with the form factor…”

Section: Coulomb Photoproductionmentioning

confidence: 99%

“…In figure 2 we demonstrate explicitly the influence of the nuclear form factor: our numerical estimates indicate that the nuclear effects are mainly saturated by the contribution of the two first terms of equation ( 4), while the correction ∆F A does not exceed 10%. For our numerical estimates we used for the parameters L i and d i the values from (14) and Table 1 of paper [11] obtained from the NJL model. These values include the resonance-exchange contributions effectively taken into account by integrating out the vector, axial-vector and scalar degrees of freedom.…”

Section: Numerical Estimates and Conclusionmentioning

confidence: 99%

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Photoproduction of neutral pion pairs in the Coulomb field of the nucleus

Bel'kov

Dillig

Lanev

1997

J. Phys. G: Nucl. Part. Phys.

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The total cross section for Coulomb photoproduction of neutral pion pairs in the reaction γA → π 0 π 0 A is estimated within the effective chiral lagrangian approach. The amplitude of γγ * → π 0 π 0 with one off-shell photon is calculated at O(p 6 ) in the momentum expansion; in addition, nuclear absorption is taken into account. Besides its experimental feasibility, the results of the calculation demonstrate that the reaction γA → π 0 π 0 A is a powerful source of information on the process γγ → π 0 π 0 close to threshold.

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Section: Coulomb Photoproductionmentioning

confidence: 99%

“…In the approach of paper [14] the nucleus is treated as a completely absorbing sphere, with the form factor…”

Section: Coulomb Photoproductionmentioning

confidence: 99%

Section: Numerical Estimates and Conclusionmentioning

confidence: 99%

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Photoproduction of neutral pion pairs in the Coulomb field of the nucleus

Bel'kov

Dillig

Lanev

1997

J. Phys. G: Nucl. Part. Phys.

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“…interaction) in the very forward direction of the particles scattered [24]- [27] ; and, on the other hand, processes involving only non-hadronic particles (photons, charged leptons, neutrinos, vector bosons W...) 1281- [35]. Mainly in connection with these studies, new formulations of the equivalent photon method were suggested by various authors [36-[38].…”

Section: -mentioning

confidence: 99%

Iv. Théorie / Theorythe Equivalent Photon Approximation in One- And Two-Photon Exchange Processes

Kessler

1974

J. Phys. Colloques

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Resume. -L'auteur rappelle le developpenient historique de I'approximation du spectre de photons equivalent (ou approxiniation de Willianis-Weizsiicker), en comnienqant par sa derivation semi-classique. L'application de cette approximation aux interactions nucleaires des muons du rayonnement cosmique (sous terre), ainsi qu'a la dinusion inelastique de diverses particules (hadroniques ou non hadroniques) par le champ coulonibien des noyaux-cibles, est evoquee. Une derivation de la formule de Williams-Weizsiicker, fondee sur la theorie des champs et utilisant I'helicite, est presentee pour les processus a Cchange d'un seul photon, puis etendue aux phenomknes a tchange de deux photons ((( collisions photon-photon n). Les conditions de validite de cette formule sont brikvement discutees, et divers tests nunieriques, dus a differents auteurs, sont prCsentCs ou du moins cites.Abstract. -The author recalls tlie historical developnient of the equivalent photon (Williams-Weizsiicker) approximation, starting from its semi-classical derivation. Its application to the nuclear interactions of underground cosmic-ray muons and to the inelastic scattering of various (hadronic or non-hadronic) particles in the Coulomb field of nuclear targets is considered. A field-theoretical derivation of the Williams-Weizsiicker formula, based on helicity, is given for the one-photon exchange case and then extended to tlie two-photon exchange case ((( photon-photon collisions D). Its conditions of validity are briefly discussed, and some numerical tests, performed by various authors, are shown or mentioned.Making a Fourier transform 1 E,(w) = -1 E,(t) cos o r d l ; n Article published online by EDP Sciences and available at http://dx.

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