Is there any processes involving weak interaction that preserve the strangeness for $S \neq 0$?

I can't find an answer to it on net or anywhere else, generally it is true that weak interaction changes strangeness by 1 unit.

  • $\begingroup$ Fixed that for you. $\endgroup$ – Gert Mar 10 at 23:43

Sure, your PDG reminds you of the strangeness-conserving decays of $$ \Sigma^\pm \to \Lambda e^\pm \nu , $$ where the antineutrino is meant to accompany the electron, mutatis mutandis.

That is, either uus or dds decays to uds , with a very small branching ratio, since, as you are implying, the heavier s is much more likely to decay to a light quark. But, in these highly informative/insightful cases, it is a light quark that weak transmutes to its isopartner.

So it is not true that weak interactions need change strangeness.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.