I Why Can a W Boson Decay into Quarks of Different Generations?

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A W Boson can decay into quark-antiquark pairs of different generations, contrary to the initial assumption that it must decay into pairs of the same generation. This process occurs less frequently due to kinematic constraints, as heavier quarks are more challenging to produce. The mixing between quark generations, described by the CKM matrix, also influences the decay rates. Overall, while decays into different generations are possible, they are rarer compared to same-generation decays. Understanding these dynamics is crucial for studying particle interactions in physics.
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Why can't a W Boson decay into for ex. up and anti strange
Hi,
i was wondering why a W Boson must always decay into a quark anti quark pair of the same generation. Why can it not for example decay into an up ant anti strange pair?
 
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The premise of the question is false. The W does indeed decay into quarks of different generations, but more rarely. The rates are controlled by the kinematics (heavier quarks are harder to produce) and the mixing between generations (which is small and given by the CKM matrix entries).
 
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