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If one insist on the axiom: "every physical process must have a definite in-between state", we have a problem with quark flavor transitions by the weak interaction. This is since there is no in-between state at the vertex where the two quarks meet the W-boson. The answer for this is if we let quarks in quark pairs/triples only swap places with other quarks/antiquarks. For example:
d-anti-s + s-anti-u + u-anti-d -> d-anti-u + u-anti-d + s-anti-s
where the s-anti-u and u-anti-d can legally be produced from energy since:
electron + electron anti-neutrino -> s-anti-u and
positron + electron neutrino -> u-anti-d.
Of course this would require that the experiments missed the produced gammas form s-anti-s annihilation.
For the explanation of why s-anti-d do not decay exactly like this, but like this: s-anti-d -> u-anti-d + pi-zero, we need to postulate that a u-anti-s also must exist so that:
s-anti-d + u-anti-s -> u-anti-d + s-anti-s -> u-anti-d + pi-zero.
Where the experiments must have missed the extra incoming particles.
d-anti-s + s-anti-u + u-anti-d -> d-anti-u + u-anti-d + s-anti-s
where the s-anti-u and u-anti-d can legally be produced from energy since:
electron + electron anti-neutrino -> s-anti-u and
positron + electron neutrino -> u-anti-d.
Of course this would require that the experiments missed the produced gammas form s-anti-s annihilation.
For the explanation of why s-anti-d do not decay exactly like this, but like this: s-anti-d -> u-anti-d + pi-zero, we need to postulate that a u-anti-s also must exist so that:
s-anti-d + u-anti-s -> u-anti-d + s-anti-s -> u-anti-d + pi-zero.
Where the experiments must have missed the extra incoming particles.