Tree-level FCNC in the B system: from CP asymmetries to rare decays

Details Tree-level FCNC in the B system: from CP asymmetries to rare decays Tree-level FCNC in the B system: from CP asymmetries to rare decays

2000-12-15

arxiv.org/abs/hep-ph/0012197v2

Phys.Rev.D64:015007,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 4 figures. Accepted version in PRD. Updated analysis with the new results from BaBar and BELLE. Figures enlarged, sma

Scientific paper

10.1103/PhysRevD.64.015007

Tree-level Flavor-Changing Neutral Currents (FCNC) are characteristic of models with extra vector-like quarks. These new couplings can strongly modify the B^0 CP asymmetries without conflicting with low--energy constraints. In the light of a low CP asymmetry in B --> J/\psi K_{S}, we discuss the implications of these contributions. We find that even these low values can be easily accommodated in these models. Furthermore, we show that the new data from B factories tend to favor an O(20) enhancement of the b --> d l \bar{l} transition over the SM expectation.

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