Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-02
Nucl.Phys.B645:155-187,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, 6 figures. Version 2: new section discussing MFV in supersymmetric models added; updated experimental data; few mino
Scientific paper
10.1016/S0550-3213(02)00836-2
We present a general analysis of extensions of the Standard Model which satisfy the criterion of Minimal Flavour Violation (MFV). We define this general framework by constructing a low-energy effective theory containing the Standard Model fields, with one or two Higgs doublets and, as the only source of SU(3)^5 flavour symmetry breaking, the background values of fields transforming under the flavour group as the ordinary Yukawa couplings. We analyse present bounds on the effective scale of dimension-six operators, which range between 1 and 10 TeV, with the most stringent constraints imposed by B -> X_s gamma. In this class of theories, it is possible to relate predictions for FCNC processes in B physics to those in K physics. We compare the sensitivity of various experimental searches in probing the hypothesis of MFV. Within the two-Higgs-doublet scenario, we develop a general procedure to obtain all tan(beta)-enhanced Higgs-mediated FCNC amplitudes, discussing in particular their impact in B -> l^+l^-, Delta M_B and B -> X_s gamma. As a byproduct, we derive some two-loop tan(beta)-enhanced supersymmetric contributions to B -> X_s gamma previously unknown.
D'Ambrosio Giancarlo
Giudice Gian F.
Isidori Gino
Strumia Alessandro
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