2001/10/31 by Gino Isidori, Alessandra Retico · 6 citations
Mathematics · Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Delta #Flavour #Geometry #Higgs boson #Limit (mathematics) #Mathematical physics #Mathematics #Neutral current #Neutrino #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Scalar (mathematics) #hep-ph
paper · pdf · doi:10.1088/1126-6708/2001/11/001
published as JHEP 0111:001,2001 · 22 pages, Latex, 6 figures; v3: minor misprints corrected with respect to the published version
openalex publication_date 2001/11/01 · arxiv created 2002/07/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 β= vu/vd) is large. We clarify the origin of this phenomenon, both in ΔF=1 and ΔF=2 processes, analysing differences and analogies between supersymmetric and non-supersymmetric models. We confirm previous findings of a sizeable enhancement at large tanβ of specific ΔF=1 and ΔF=2 amplitudes in the MSSM and, in these cases, we discuss how large-tanβ corrections can be controlled beyond lowest order. Finally, we emphasize the unique role of the rare processes Bs,d → τ+ τ- and Bs,d → μ+ μ- in probing this scenario.