Universal unitarity triangle and physics beyond the standard model

2000/07/10 by A. J. Buras, A.J. Buras, P. Gambino +4 · 457 citations
Physics and Astronomy · #Asymmetry #Branching fraction #CP violation #Cabibbo–Kobayashi–Maskawa matrix #Higgs boson #Neutrino Physics Research #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #Unitarity #hep-ph

paper · pdf · doi:10.1016/s0370-2693(01)00061-2

published in Physics Letters B 500(1-2), 161-167 (Elsevier BV) · 12 pages, 1 figure

arxiv created 2000/07/10 · openalex publication_date 2001/02/01 · arxiv updated 2010/11/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (Delta M)_d/(Delta M)_s and sin(2 beta) measured first through the CP asymmetry in B_d⁰ to psi K_S and later in K to pi nu nubar decays. Also suitable ratios of the branching ratios for B to X_d,s nu nubar and B_d,s to mu⁺ mu^- and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the non-universal triangles extracted in each model using epsilon, (Delta M)_d and various branching ratios for rare decays will allow to find out in a transparent manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.

Citations

• Long distance contribution to
• Waiting for the top quark mass,K+→π+νν¯,Bs0-B¯s0mixing, andCPasymmetries inBdecays
• Study of long distance contributions toK→nπνν¯
• CP-Violation in the Renormalizable Theory of Weak Interaction

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