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The Standard Model photon is a mixture of the B field of weak hypercharge and the third W field of weak isospin. A "photino" would therefore be a mixture of the corresponding gauginos (the Bino and the third Wino). If such a mixture would exist as a physical state (as in the case of the photon) probably depends on the exact SUSY model. The same applies to the "Zino", the superpartner of the Z boson. 178.200.137.235 (talk) 18:18, 4 April 2015 (UTC)
Casimir effect?
editI've not studied particle or theoretical physics since my BSc days, however wasn't existence of the photino eliminated by the discovery of the Casimir effect?
Photino?
edit"Photino" redirects here, but it is not mentioned in the article. I'd like to know what supersymmetry says, if anything, about photons, but this subject is apparently not mentioned anywhere on Wikipedia. The article on supersymmetry even says all the bosons have supersymmetric counterparts, then lists them, though there is visibly no counterpart to the photon (which, last time I checked, is a boson). It's really weird and confusing. 146.6.208.17 (talk) 19:54, 13 December 2011 (UTC)
- I know that you probably aren't active anymore, and this comment is 12 years old, but here's the answer (according to my understanding of particle physics):
- The photon and the Z boson are actually not particles at the scales at which supersymmetry remains unbroken, but are instead mixtures of two more fundamental particles, the W0 particle (the third part of the group to which the W± bosons belong, which acts on weak isospin) and the B boson (which acts on weak hypercharge). The reason we don't see these particles in our everyday lives is because the symmetries that they operate on are broken by the Higgs field's vacuum expectation value having a non-zero value under a certain energy (or, equivalently, temperature). But back to the reason we don't see 'photinos' or 'Zinos' (at least, in the more simple SUSY theories; see photino; these also mix with the Higgsinos to make matters even more complicated). The electroweak symmetry breaking means that the B and the W0 need to be mixed, but there is no reason for the B̃ (Bino) and W̃0 (neutral Wino) to necessarily mix by the same amount. Hope this helps, UnbiasedBrigade (talk) 17:59, 3 February 2023 (UTC)