photinon.
/fəʊˈtiːnəʊ/, U.S. /ˌfoʊˈtinoʊ/ Particle Physics.
A hypothetical particle which is the supersymmetric counterpart of the photon, with spin ½ rather than 1.
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photino1977
1977 P. Fayet in Physics Lett. B. 70 464/1 R is..violated by gravitation..the magnitude of the violation is given by the gravitino mass; it may lead, later on, to masses for the photino and gluinos (spin ½ partners of the photon and gluons).
1985 Nature 3 Oct. 411/2 In supersymmetric (SUSY) theories, the photino is the fermion partner of the photon and is expected to be the lightest stable particle.
1989 M. Longair in P. Davies New Physics vi. 205/2 One of the few ways of detecting hypothetical particles such as axions and photinos may be through the measurement of cosmic fluxes of these particles.
2001 New Scientist 5 May 30/1 The extra particles are known as superpartners. The electron partners the selectron, the top quark partners the stop squark, the photon partners the photino.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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