In beta decay, explain qualitatively What will happen if neutrinos are not massless particles?
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? But they are not. What do you mean? – Cosmas Zachos Nov 12 '21 at 16:58
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@Cosmos Zachos We usually consider them as a massless in beta decay. – Rick Andy Nov 12 '21 at 17:08
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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. – Cosmas Zachos Nov 12 '21 at 17:14
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1Related: https://physics.stackexchange.com/q/15320/2451 , https://physics.stackexchange.com/q/644270/2451 and links therein. – Qmechanic Nov 12 '21 at 17:38