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

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SUMMARY

The W Boson can decay into quark-antiquark pairs of different generations, contrary to the initial premise of the discussion. This decay occurs less frequently due to kinematic constraints, as heavier quarks are more challenging to produce. Additionally, the mixing between generations is governed by the CKM (Cabibbo-Kobayashi-Maskawa) matrix, which indicates that the probability of such decays is relatively low. Understanding these factors is crucial for comprehending W Boson decay processes in particle physics.

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TL;DR
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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