New Physics in Rare B Decays after Moriond 2021

Understand

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.