New Physics in Rare B Decays after Moriond 2021

Abstract

The anomalies in rare $B$ decays endure. We present results of an updated global analysis that takes into account the latest experimental input -- in particular the recent results on $R_K$ and BR$(B_s\to {\mu }^{+}{\mu }^{-})$ -- and that qualitatively improves the treatment of theory uncertainties. Fit results are presented for the Wilson coefficients of four-fermion contact interactions. We find that muon specific Wilson coefficients $C_9\simeq -0.73$ or $C_9=-C_{10}\simeq -0.39$ continue to give an excellent description of the data. If only theoretically clean observables are considered, muon specific $C_{10}\simeq 0.60$ or $C_9=-C_{10}\simeq -0.35$ improve over the Standard Model by $\sqrt{\Delta {\chi }^2}\simeq 4.7\sigma$ and $\sqrt{\Delta {\chi }^2}\simeq 4.6\sigma$, respectively. In various new physics scenarios we provide predictions for lepton flavor universality observables and CP asymmetries that can be tested with more data. We update our previous combination of ATLAS, CMS, and LHCb data on BR$(B_s\to {\mu }^{+}{\mu }^{-})$ and BR$(B^0\to {\mu }^{+}{\mu }^{-})$ taking into account the full two-dimensional non-Gaussian experimental likelihoods.

arXiv comment34 pages, 11 figures, 6 tables. v3: fits with 4 and 6 parameters added, appendix on theory uncertainties added, experimental data updated, numerics updated, discussion extended

References in corpus (35)

• FLAG Review 2019
• Symmetries and Asymmetries of B -> K* mu+ mu- Decays in the Standard Model and Beyond
• $B\to V{\ell }^{+}{\ell }^{-}$ in the Standard Model from Light-Cone Sum Rules
• On the Standard Model predictions for $R_K$ and $R_{K^{\ast }}$
• Charm-loop effect in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }\gamma$
• New physics in $b\to s$ transitions after LHC run 1
• Probing New Physics via the $B_s^0\to {\mu }^{+}{\mu }^{-}$ Effective Lifetime
• Interpreting Hints for Lepton Flavor Universality Violation
• B-decay discrepancies after Moriond 2019
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and effective lifetime and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• Towards the discovery of new physics with lepton-universality ratios of $b\to s\ell \ell$ decays
• Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark
• Emerging patterns of New Physics with and without Lepton Flavour Universal contributions
• Study of the rare decays of $B_s^0$ and $B^0$ mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
• $B\to K{\ell }^{+}{\ell }^{-}$ decay at large hadronic recoil
• Theory of B -> K(*)l+l- decays at high q^2: OPE and quark-hadron duality
• CP Asymmetries in bar B -> bar K* (-> bar K pi) l+ l- and Untagged bar B_s,B_s -> phi (-> K+ K-) l+ l- Decays at NLO
• On the single leptoquark solutions to the $B$-physics anomalies
• Status of the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ anomaly after Moriond 2017
• A Global Likelihood for Precision Constraints and Flavour Anomalies
• New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ confronts new data on Lepton Universality
• Predictions for Lepton Flavor Universality Violation in Rare B Decays in Models with Gauged $L_{\mu }-L_{\tau }$
• Diagnosing lepton-nonuniversality in $b\to s\ell \ell$
• Continuing search for new physics in $b\to s\mu \mu$ decays: two operators at a time
• The $B$ Anomalies and New Physics in $b\to s{e}^{+}{e}^{-}$
• Non-local matrix elements in $B_{(s)}\to \{K^{(\ast )},\varphi \}{\ell }^{+}{\ell }^{-}$
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• QED Corrections in $\bar{B}\to \bar{K}{\ell }^{+}{\ell }^{-}$ at the Double-Differential Level
• Lessons from the $B^{0,+}\to K^{\ast 0,+}{\mu }^{+}{\mu }^{-}$ angular analyses
• Implications for New Physics in $b\to s\mu \mu$ transitions after recent measurements by Belle and LHCb
• $B_s\to {\mu }^{+}{\mu }^{-}$ as current and future probe of new physics
• Charming new physics in rare B-decays and mixing?
• On the new LHCb angular analysis of $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$: Hadronic effects or New Physics?
• Enhanced CP asymmetries in $B\to K{\mu }^{+}{\mu }^{-}$

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• Leptoquarks and Matter Unification: Flavor Anomalies and the Muon $g-2$
• Leptoquark Option for $B$-meson Anomalies and Leptonic Signatures
• Cornering the Two Higgs Doublet Model Type II
• New physics in $b\to s\ell \ell$ decays with complex Wilson coefficients
• From B-meson anomalies to Kaon physics with scalar leptoquarks
• Mixed modulus and anomaly mediation in light of the muon $g-2$ anomaly
• Renormalization group improved implications of semileptonic operators in SMEFT
• Muon $(g-2)$ and Flavor Puzzles in the $U(1{)}_X^{}$-gauged Leptoquark Model
• A unique discrimination between new physics scenarios in $b\to s{\mu }^{+}{\mu }^{-}$ anomalies
• Perturbative unitarity constraints on generic Yukawa interactions
• $\ge 4\mu$ signal from a vector-like lepton decaying to a muon-philic $Z^{\prime }$ boson at the LHC
• Sub-GeV $U(1{)}_R$ gauge boson to address the proton radius discrepancy
• Updated measurement of $R_K$ at LHCb
• Anomalous measurements: recent results deepen flavour puzzle