The discussion revolves around the classification of the interaction process π- + p→Λ + K0, specifically questioning why it is considered a strong interaction despite changes in quark content. Participants explore the implications of strangeness conservation and the nature of hadronic interactions.
Participants express differing views on the classification of the interaction, with no consensus reached on whether the process must be strong or if it can also be weak or electromagnetic. The discussion remains unresolved regarding the general rules governing these interactions.
Participants highlight limitations in their arguments, including the dependence on definitions of strangeness conservation and the specific types of quarks involved in the interactions.
Xuekai Du said:Since the quark content changed.
1) It is pure hadronic interaction, and 2) strangeness is conserved: Strangeness-conserving hadronic interactions can not be weak.Xuekai Du said:π- + p→Λ + K0
Why is this a strong interaction instead of weak? Since the quark content changed.
This isn't a general rule. Hadronic-only strangeness-changing processes must be weak, but hadronic-only strangeness-conserving processes needn't be strong. The example in the original post can proceed via strong, weak, or electromagnetic diagrams (albeit that does mean it would be called "strong" since that diagram will dominate). The decay ##B_s^0 \rightarrow D_s^{^-} \pi^+## conserves strangeness but proceeds only weakly since bottomness and charmness are changed.samalkhaiat said:Strangeness-conserving hadronic interactions can not be weak.
My statement was about light hadrons, i.e., flavour [itex]SU(3)[/itex]. Of course, if you include heavy quarks, then you can have weak decays in which the s-quark behaves as spectator giving [itex]| \Delta S | = 0[/itex].Envelope said:This isn't a general rule. Hadronic-only strangeness-changing processes must be weak, but hadronic-only strangeness-conserving processes needn't be strong. The example in the original post can proceed via strong, weak, or electromagnetic diagrams (albeit that does mean it would be called "strong" since that diagram will dominate). The decay ##B_s^0 \rightarrow D_s^{^-} \pi^+## conserves strangeness but proceeds only weakly since bottomness and charmness are changed.