Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-09
JHEP 0111:001,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, Latex, 6 figures; v3: minor misprints corrected with respect to the published version
Scientific paper
10.1088/1126-6708/2001/11/001
We analyse scalar flavour-changing neutral currents of down-type quarks in models with two Higgs doublets, coupled separately to up- and down-type quarks, in the limit where the ratio of the two expectation values ($\tan \beta = v_u/v_d$) is large. We clarify the origin of this phenomenon, both in $\Delta F=1$ and $\Delta F=2$ processes, analysing differences and analogies between supersymmetric and non-supersymmetric models. We confirm previous findings of a sizeable enhancement at large $\tan\beta$ of specific $\Delta F=1$ and $\Delta F=2$ amplitudes in the MSSM and, in these cases, we discuss how large-$\tan\beta$ corrections can be controlled beyond lowest order. Finally, we emphasize the unique role of the rare processes $B_{s,d} \to \tau^+ \tau^-$ and $B_{s,d} \to \mu^+ \mu^-$ in probing this scenario.
Isidori Gino
Retico Alessandra
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