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Forward elastic scattering of light on light, \(\gamma+\gamma\rightarrow\gamma+\gamma\)

  • M.M. Block G. Pancheri
Theoretical Physics

Abstract.

The forward elastic scattering of light on light, i.e., the reaction \(\gamma+\gamma\rightarrow\gamma+\gamma\) in the forward direction, is analyzed utilizing real analytic amplitudes. We calculate \(\rho_{\gamma \gamma}\), the ratio of the real to the imaginary portion of the forward scattering amplitude, by fitting the total \(\gamma \gamma\) cross section data in the high energy region 5 GeV \(\le \sqrt s\le 130\) GeV, assuming a cross section that rises asymptotically as ln2 s. We then compare \(\rho_{\gamma \gamma} to \rho_{nn}\), the ratio of the even portions of the pp and \(\bar pp\) forward scattering amplitudes, as well as to \(\rho_{\gamma p}\) [1], the \(\rho\) value for Compton scattering. Within errors, we find that the three \(\rho\)-values in the c.m.s. energy region 5 GeV\(\le \sqrt s\le\) 130 GeV are the same, as predicted by a factorization theorem of Block and Kaidalov [2].

Keywords

Energy Region Total Cross Section Elastic Scattering Cross Section Data Forward Direction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2002

Authors and Affiliations

  • M.M. Block G. Pancheri
    • 1
  1. 1.Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA US

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