Summary
The role of a dynamical cut-off in the equivalent-photon approximation is analysed. Its influence on the estimation of the γ→X cross-section from e+e−→e+e−X is negligible when the electrons are not tagged. However, the role of this cut-off becomes important when the phase space is reduced by electron tagging.
Riassunto
Si analizza il ruolo di un taglio dinamico nell'approssimazione del fotone equivalente. La sua influenza sulla stima della sezione d'urto γγ→X a partire da e+e−→e+e−X è trascurabile, quando gli elettroni non sono marcati. Comunque il ruolo di questo cut-off diventa importante quando lo spazio di fase è ridotto dalla marcatura degli elettroni.
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Defrise, M. Equivalent-photon approximation for two-photon processes. Nuov Cim A 54, 261–276 (1979). https://doi.org/10.1007/BF02770003
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DOI: https://doi.org/10.1007/BF02770003