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Truly neutral particle
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==Examples== Known examples of such elementary particles include [[photon]]s, [[Z boson]]s, and [[Higgs boson]]s, along with the hypothetical [[neutralino]]s, [[sterile neutrino]]s, and [[graviton]]s. For a [[spin-Β½]] particle such as the neutralino, being ''truly neutral'' implies being a [[Majorana fermion]]. By way of contrast, neutrinos are not ''truly neutral'' since they have a [[weak isospin]] of {{sfrac|Β±|1|2}}, or equivalently, a non-zero [[weak hypercharge]], both of which are charge-like quantum numbers.
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