# W- boson and beta decay (old title: Nuclear physics)

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1. Aug 21, 2014

### smk

How W- boson decay into electron and anti neutrino?

2. Aug 21, 2014

### ChrisVer

Well it depends on what you find as a satisfying answer. I'd say that it decays into such, because "it can" . It's allowed to (due to the symmetries) interact/couple with those particles and so it does.

+ the ( W-> e nu ) is conserving all the quantities we think that are conserved.

P.S. - the title of the thread is misleading, you should try to write a title that represents clearly your question.

3. Aug 21, 2014

### smk

Thank...basically I m confused in beta decay.in which proton is transformed in to neutron.as we know that proton is lighter then neutron.

4. Aug 21, 2014

### ChrisVer

And that actually means that a proton by itself cannot decay to a neutron (what I'm saying is that the proton decay is not an 1->3 particle decay).
In fact it needs to be able to drain energy from the environment so that is to say the decay is actually of the form:
$p e^- \rightarrow n \nu$
or having something else:
$X p \rightarrow X n e^+ \nu$
So a 1+(1)->3+(1) which can energetically allow it.

5. Aug 21, 2014

Thanks