Measurement of Electroproduction of Muon Pairs

D. R. Earles; R C. Chase; W. L. Faissler; M. W. Gettner; G. Glass; G. Lutz; R. G. Parsons; P. L. Rothwell; K. M. Moy; H. von Briesen, Jr; E. von Goeler; Roy Weinstein

doi:10.1103/PhysRevLett.25.129

Measurement of Electroproduction of Muon Pairs

D. R. Earles, R C. Chase, W. L. Faissler, M. W. Gettner, G. Glass, G. Lutz, R. G. Parsons, P. L. Rothwell, K. M. Moy, H. von Briesen, Jr., E. von Goeler, and Roy Weinstein

Phys. Rev. Lett. 25, 129 – Published 13 July 1970

Abstract

An experiment on electroproduction of muon pairs with invariant masses between 400 and 900 MeV is reported. The experiment, interpreted as a text of the timelike photon propagator, shows agreement with QED. Photon propagator modifications representing (+) metric and (-) metric heavy photons are limited to masses $Λ > 1260$ and $Λ > 750$ MeV, respectively (15 times the mass limits of positronium experiments). A model used to calculate $ρ - Q E D$ interference yields a best $ρ - Q E D$ phase angle of 16°±22°.

Received 27 February 1970

DOI:https://doi.org/10.1103/PhysRevLett.25.129

Authors & Affiliations

D. R. Earles^*, R C. Chase^†, W. L. Faissler, M. W. Gettner, G. Glass^‡, G. Lutz, R. G. Parsons^§, P. L. Rothwell^∥, K. M. Moy^¶, H. von Briesen, Jr., E. von Goeler, and Roy Weinstein^**

Department of Physics, Northeastern University at Boston, Boston, Massachusetts 02115

^*This material represents part of a thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
^†Now at University of Minnesota, Minneapolis, Minn.
^‡Now at University of Washington, Seattle, Wash.
^§Now at University of Texas, Austin, Tex.
^∥Now at Air Force Cambridge Research Laboratories, Bedford, Mass.
^¶Now at Brookhaven National Laboratory, Upton, N. Y.
^**On leave at Stanford Linear Accelerator, Stanford, Calif.