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.

34 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 (6)

• Probing New Physics via the $B_s^0\to {\mu }^{+}{\mu }^{-}$ Effective Lifetime
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• On the single leptoquark solutions to the $B$-physics anomalies
• Diagnosing lepton-nonuniversality in $b\to s\ell \ell$
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• Lessons from the $B^{0,+}\to K^{\ast 0,+}{\mu }^{+}{\mu }^{-}$ angular analyses

Cited by in corpus (18)

• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• $B$ Flavour Anomalies: 2021 Theoretical Status Report
• Muon $g-2$ and $B$-anomalies from Dark Matter
• GUT-constrained supersymmetry and dark matter in light of the new $(g-2{)}_{\mu }$ determination
• Searching for Leptoquarks at Future Muon Colliders
• Unveiling Hidden Physics at the LHC
• Leptoquarks and Matter Unification: Flavor Anomalies and the Muon $g-2$
• Cornering the Two Higgs Doublet Model Type II
• Leptoquark Option for $B$-meson Anomalies and Leptonic Signatures
• 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
• 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