| Numéro |
J. Phys. Colloques
Volume 35, Numéro C2, Mars 1974
Colloque international sur les collisions photon-photon dans les anneaux de stockage électron-positron / International colloquium on photon-photon collisions in electron-positron storage rings
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| Page(s) | C2-123 - C2-123 | |
| DOI | https://doi.org/10.1051/jphyscol:1974231 | |
Colloque international sur les collisions photon-photon dans les anneaux de stockage électron-positron / International colloquium on photon-photon collisions in electron-positron storage rings
J. Phys. Colloques 35 (1974) C2-123-C2-123
DOI: 10.1051/jphyscol:1974231
1 Joseph-Henry Laboratories, Princeton University, Princeton, New Jersey 08540, USA
2 Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14850, USA
J. Phys. Colloques 35 (1974) C2-123-C2-123
DOI: 10.1051/jphyscol:1974231
Corrections to equivalent photon approximation for two-photon processes in colliding beams
K. SUBBARAO1, 21 Joseph-Henry Laboratories, Princeton University, Princeton, New Jersey 08540, USA
2 Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14850, USA
Abstract
The cross section for the two-photon process ee → eeƉ in colliding electron beams, in the limit E → ∞ with E2/s fixed (E being the energy per beam of the colliding electrons of mass m, and √s the invariant mass of the state Ɖ) is well known to have a leading term of order (ln 4 E2/m2)2. This leading term in given correctly by the well-known Weizsacker-Williams approximation or the equivalent photon approximation. There are sizeable corrections coming from non-leading terms of which the first one, namely, the term of order (ln 4 E2/m2) has been obtained for an arbitrary hadronic final state Ɖ. The approximations made in getting the Weizsacker-Williams result and the correction terms due to each of them have been exhibited.