The Effects of Flavor Changing Neutral Current and Cabibbo-Kobayashi-Maskawa Matrix

Penulis: L.T. Handoko
We study the effects of tree-level flavor changing neutral current and its present status with Cabibbo-Kobayashi-Maskawa matrix. Especially, we remark the effects of flavor changing neutral current on the unitary triangle of Cabibbo-Kobayashi-Maskawa matrix. In the case when the unitarity is nearly conserved, we find that the allowed FCNC in the db-sector is ~~ zddb/(VCKMtd VCKMtb)~~ = O(10-2)$, from the evaluation of the present bounds for the mixing size of neutral B meson (xd), and the CP violation parameter in the neutral K meson (epsilon). Although the size is small, the new physics due to the tree-level FCNC in the db-sector is expected to be visible in the B -> Xd l+ l- and the CP asymmetries in the neutral B meson system. In the case when the unitarity is violated and the quadrangle is conserved, the FCNC is large enough, i.e. ~~ zddb/(VCKMtd VCKMtb)~~ = O(1). Then, a significant contribution is also expected in the inclusive B -> Xd photon decay.

MSc Theses at Hiroshima Univ. (1995)


No. Arsip : LIPI-95015
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