HAL Id: jpa-00215548
https://hal.archives-ouvertes.fr/jpa-00215548
Submitted on 1 Jan 1974
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.
L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Nuclei as generators of quasi-real photons
C. Carimalo, G. Cochard, P. Kessler, J. Parisi, B. Roehner
To cite this version:
C. Carimalo, G. Cochard, P. Kessler, J. Parisi, B. Roehner. Nuclei as generators of quasi-real photons.
Journal de Physique Colloques, 1974, 35 (C2), pp.C2-125-C2-125. �10.1051/jphyscol:1974238�. �jpa-
00215548�
CONTRIBUTIONS C2- 1 25
in the final state. In the muon case, the counting rate should be high enough to allow this experiment to be performed with electron-positron storage rings of the next generation.
Nuclei as generators of quasi-real photons C. CARIMALO, G. COCHARD, P. KESSLER,
J. PARISI and B. ROEHNER Laboratoire de Physique Corpusculaire,
College de France, Paris, France
Abstract. - An equivalent photon approximation is tested for the inelastic scattering of high-energy
non-hadronic particles (leptons and photons) in the electromagnetic field of nuclei. Coherent, incoherent elastic and incoherent inelastic contributions are included. As for the coherent (Coulomb) term, various nuclei (92U235, 27C059, 6 C 1 2 ) with different types of form factors are considered. Four processes are considered
:a ) photoproduction of muon pairs
;6 ) muon bremsstrahlung
;c) muon trident produc- ion (term with the time-like photon only) ; d ) neutri- noproduction of a vector boson. The comparison of the approximation with the exact calculation is made for da/dW, where W is the invariant mass of the non- hadronic system produced. The approximation works well in general. As an application, we show the full calculation of the muon trident process (except for the correction due to the Pauli principle).
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1974238