Confronting lepton flavor universality violation in B decays with high-$p_T$ tau lepton searches at LHC

摘要

We confront the indications of lepton flavor universality (LFU) violationobserved in semi-tauonic $B$ meson decays with new physics (NP) searches usinghigh $p_T$ tau leptons at the LHC. Using effective field theory arguments wecorrelate possible non-standard contributions to semi-tauonic charged currentswith the $\tau^+ \tau^-$ signature at high energy hadron colliders. Severalrepresentative standard model extensions put forward to explain the anomaly areexamined in detail: (i) weak triplet of color-neutral vector resonances, (ii)second Higgs doublet and (iii) scalar or (iv) vector leptoquark. We find that,in general, $\tau^+ \tau^-$ searches pose a serious challenge to NPexplanations of the LFU anomaly. Recasting existing 8 TeV and 13 TeV LHCanalyses, stringent limits are set on all considered simplified models. Futureprojections of the $\tau^+ \tau^-$ constraints as well as caveats ininterpreting them within more elaborate models are also discussed.