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In beta decay, explain qualitatively What will happen if neutrinos are not massless particles?

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  • $\begingroup$ ? But they are not. What do you mean? $\endgroup$
    – Cosmas Zachos
    Commented Nov 12, 2021 at 16:58
  • $\begingroup$ @Cosmos Zachos We usually consider them as a massless in beta decay. $\endgroup$
    – Rick Andy
    Commented Nov 12, 2021 at 17:08
  • $\begingroup$ You just normally ignore their mass because it is so preternaturally small in comparison to any other scale in the problem. You want the first perturbative correction in the neutrino mass? Why? It is freakishly small. $\endgroup$
    – Cosmas Zachos
    Commented Nov 12, 2021 at 17:14
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    $\begingroup$ Related: physics.stackexchange.com/q/15320/2451 , physics.stackexchange.com/q/644270/2451 and links therein. $\endgroup$
    – Qmechanic ♦
    Commented Nov 12, 2021 at 17:38

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