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Decay of K mesons as a test of the universal Fermi interaction

Zachariasen, F. (1958) Decay of K mesons as a test of the universal Fermi interaction. Physical Review, 110 (6). pp. 1481-1482. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:ZACpr58

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Abstract

On the basis of current experimental evidence, there is no distinction between µ mesons and electrons other than a difference in rest mass. Electromagnetic interactions are identical since electrons and µ mesons have the same charge, and the hypothesis of a universal Fermi interaction, which asserts that they couple in exactly the same way in the weak interactions, has received considerable support by comparing β-decay phenomena with the decay of free µ mesons and µ capture in nuclei. An at least equally fruitful series of experiments for reassuring one about the validity of the universal interaction idea is the analysis of the decays of µ and K mesons into electrons and µ mesons. The details of such individual decays are not easily obtained theoretically, since they presumably involve strongly coupled virtual particles; however, the ratio of decay rates into electron modes and µ-meson modes may often be calculated exactly with no assumptions beyond saying that the weak interaction is local and may be treated in first order, and that the weak interaction is the same for electrons and µ mesons.(1)


Item Type:Article
Additional Information:© 1958 by The American Physical Society. Received March 10, 1958. I would like to thank S. Drell for several valuable conversations. This research was supported by the U.S. Air Force through the Air Force Office of Scientific Research.
Record Number:CaltechAUTHORS:ZACpr58
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ZACpr58
Alternative URL:http://dx.doi.org/10.1103/PhysRev.110.1481
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10320
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Apr 2008
Last Modified:26 Dec 2012 09:59

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