ZU-TH 12/06; hep-ph/0605170 THEORETICAL STATUS OF K → πνν̄ DECAYS
نویسنده
چکیده
The rare processes K → πνν̄ and KL → π νν̄ play an outstanding role in the field of flavorchanging-neutral-current transitions. The main reason for this is their unmatched theoretical cleanness and their large sensitivity to short-distance (SD) effects arising in the standard model (SM) and its innumerable extensions. As they offer a precise determination of the unitarity triangle (UT) , a comparison of the information obtained from the K → πνν̄ system with the one from B-decays provides a completely independent and therefore critical test of the CabibboKobayashi-Maskawa (CKM) mechanism. Even if these Kand B-physics predictions agree, the K → πνν̄ transitions will play an important part in discriminate between different extensions of the SM , as they allow to probe effective scales of new physics operators of up to a several TeV or even higher 3 in a pristine manner.
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تاریخ انتشار 2006