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In Pursuit of New Physics with B_s Decays
Isard Dunietz, Robert Fleischer, Ulrich Nierste
The presence of a sizeable CP-violating phase in B_s^0-B_s^0-bar mixing would be an unambiguous signal of physics beyond the Standard Model. We analyse various possibilities to det…
b -> s γand supersymmetry with large tanβ
M. Carena, D. Garcia, U. Nierste +1
We discuss the constraints on the supersymmetric parameter space from the decay mode b -> s γfor large values of tanβ. We improve the theoretical prediction for the decay rate by s…
QCD corrections to lifetime differences of B_s mesons
Ulrich Nierste
The calculation of QCD corrections to the width difference Delta Gamma in the B_s meson system is presented. The next-to-leading order corrections reduce the dependence on the reno…
Probing Light Sbottoms with B Decays
Ulrich Nierste, Tilman Plehn
We discuss recently reported experimental hints for a bottom squark with mass around 3.5 GeV decaying as sbottom -> charm + lepton + anti-sneutrino. We correlate the sbottom lifeti…
B_{s,d} -> l+ l- in a Two-Higgs-Doublet Model
Heather E. Logan, Ulrich Nierste
We compute the branching fractions of B_{s,d} -> l+ l- in the type-II two-Higgs-doublet model with large tan(beta). We find that the parameters of the neutral Higgs sector of the t…
Effective lagrangian for the tbH^+ interaction in the MSSM and charged Higgs phenomenology
M. Carena, D. Garcia, U. Nierste +1
In the framework of a 2HDM effective lagrangian for the MSSM, we analyse important phenomenological aspects associated with quantum soft SUSY-breaking effects that modify the relat…