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

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• 作者：Darius A. Faroughy^a ; ^{darius.faroughy@ijs.si} ; Admir Greljo^b ; ^c ; ^{admir@physik.uzh.ch} ; Jernej F. Kamenik^a ; ^d ; ^{jernej.kamenik@cern.ch}
• 刊名：Physics Letters B
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：764
• 期：Complete
• 页码：126-134
• 全文大小：3317 K
• 卷排序：764

文摘

We confront the indications of lepton flavor universality (LFU) violation observed in semi-tauonic B   meson decays with new physics (NP) searches using high pTpT tau leptons at the LHC. Using effective field theory arguments we correlate possible non-standard contributions to semi-tauonic charged currents with the τ+τ−τ+τ− signature at high energy hadron colliders. Several representative standard model extensions put forward to explain the anomaly are examined 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, τ+τ−τ+τ− searches pose a serious challenge to NP explanations of the LFU anomaly. Recasting existing 8 TeV and 13 TeV LHC analyses, stringent limits are set on all considered simplified models. Future projections of the τ+τ−τ+τ− constraints as well as caveats in interpreting them within more elaborate models are also discussed.