Constraints on New Physics from $B$ mesons

Abstract

These proceedings review the status of New Physics contributions to flavour violating $B$ decays. The anomalies in charged and neutral current $B$ decays related to lepton flavour universality violation have received a substantial amount of attention over the past years, and we discuss the current status in light of the new data presented earlier this year. We also recall a tension in the neutral $B$ meson mixing observables $\Delta M_d$ and $\Delta M_s$ and in particular their ratio, when compared with their SM predictions obtained using tree-level determinations of the CKM matrix and the recent lattice QCD results for the relevant hadronic matrix elements. Last but not least, we advocate kaon physics as a unique probe of very high energy scales and briefly discuss the current status of ${\epsilon }^{\prime }/\epsilon$ and $K\to \pi \nu \bar{\nu }$.

15 pages, 4 figures. v2: typos corrected and reference added. Proceedings of the XXIX International Symposium on Lepton Photon Interactions at High Energies - LeptonPhoton2019, 5-10 August 2019, Toronto, Canada

References in corpus (8)

• Lepton universality violation and lepton flavor conservation in $B$-meson decays
• Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ with a semileptonic tagging method
• Measurement of the $D^{\ast -}$ polarization in the decay $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$
• Angular distributions of $\bar{B}\to D^{(\ast )}\ell {\bar{\nu }}_{\ell }$ decays and search of New Physics
• SU(3)-breaking ratios for $D_{(s)}$ and $B_{(s)}$ mesons
• Lepton Flavor Universality tests through angular observables of $\overline{B}\to D^{(\ast )}\ell \overline{\nu }$ decay modes
• ${\epsilon }^{\prime }/\epsilon$-2018: A Christmas Story
• Summary of the 2018 CKM working group on semileptonic and leptonic $b$-hadron decays

Cited by in corpus (2)

• Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $R_{D^{(\ast )}}$ anomalies
• Toward accurate form factors for $B$-to-light meson decay from lattice QCD