BR(Bs to mu+ mu-) as an electroweak precision test

Abstract

Using an effective-theory approach, we analyze the impact of BR(Bs to mu+ mu-) in constraining new-physics models that predict modifications of the Z-boson couplings to down-type quarks. Under motivated assumptions about the flavor structure of the effective theory, we show that the bounds presently derived from BR(Bs to mu+ mu-) on the effective Z-boson couplings are comparable (in the case of minimal flavor violation) or significantly more stringent (in the case of generic partial compositeness) with respect to those derived from observables at the Z peak.

8 pages, 1 figure. v3: minor textual modifications; minor update in the numerics; no change in results. Matches journal version (PLB)

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• Towards the Identification of New Physics through Quark Flavour Violating Processes
• Probing New Physics with the B_s to μ+ μ- Time-Dependent Rate
• Strong Higgs Interactions at a Linear Collider
• Flavor hierarchies from dynamical scales
• Anatomy of flavour-changing Z couplings in models with partial compositeness
• Study of the rare decays of $B_s^0$ and $B^0$ into muon pairs from data collected during the LHC Run 1 with the ATLAS detector
• $B_s\to {\mu }^{+}{\mu }^{-}$ as current and future probe of new physics
• Probing anomalous $t\bar{t}Z$ interactions with rare meson decays
• Extending the Analysis of Electroweak Precision Constraints in Composite Higgs Models
• Constraints on $Z^{\prime }$ Boson within Minimal Flavor Violation
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• Anarchic Yukawas and top partial compositeness: the flavour of a successful marriage
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• On the Universal Texture in the PA-2HDM for the V-SPIN case
• The B_s --> mu+mu- and B_d --> mu+mu- Decays: Standard Model and Beyond