New physics in rare B decays after Moriond 2021

Journal Article · 28 October 2021 · European Physical Journal. C, Particles and Fields

DOI: https://doi.org/10.1140/epjc/s10052-021-09725-1 · OSTI ID:1828087

Altmannshofer, Wolfgang; Stangl, Peter

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

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0010107
• OSTI ID: 1828087
• Journal Information: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 10 Vol. 81; ISSN 1434-6044
• Publisher: Springer Science + Business MediaCopyright Statement
• Country of Publication: Germany
• Language: English