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+ | ====== TTP04-13 Precision Measurements and CKM Unitarity ====== | ||
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+ | < | ||
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+ | tau_n = 885.7(7)sec leads to the precise prediction g_A=1.2703(8) which is | ||
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+ | are described and updated. The long accepted Particle Data Group value of |Vus| | ||
+ | from fitted K_{e3} decay rates suggests a deviation from CKM unitarity but it | ||
+ | is contradicted by more recent experimental results which confirm unitarity | ||
+ | with good precision. An outlook for possible future advances is given. | ||
+ | </ | ||
+ | |**Andrzej Czarnecki, William J. Marciano, Alberto Sirlin** | ||
+ | |** Phys.Rev. | ||
+ | | {{preprints: | ||
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