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

By D. Faroughy, Admir Greljo, Jernej F. Kamenik. 2016

288 citations recorded by the source corpus.

Abstract We confront the indications of lepton flavor universality (LFU) violation observed in semi-tauonic B meson decays with new physics (NP) searches using high p T 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 − 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 − 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 − constraints as well as caveats in interpreting them within more elaborate models are also discussed.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d618b788943f0b158baa7bd2a1181789b8232252

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In Nuclear and High Energy Physics

Citations in the corpus

Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb−1 of pp collisions at s=13$$ \sqrt{s}=13 $$ TeV with the ATLAS detector (2018, background): “flavour universality violation in semi-tauonic B meson decays [39].”
What is the scale of new physics behind the B-flavour anomalies? (2017, background): “Under the assumption of leading third generation couplings one can look at pp(bb) → ττ searches, which however are not yet sensitive enough to rule out the explanation of RD(∗) via U1 [46].”
B-decay anomalies in a composite leptoquark model (2016, methodology): “However it is straightforward to translate the results of [45] into the parameters of our model.”
Review of lepton universality tests in B decays (2018, background): “Leptoquark models are also bounded by high-pT constraints [151], but the bounds can be avoided by assuming large couplings to the second generation [176,206,207].”
B-decay discrepancies after Moriond 2019 (2019, background): “pointed out in [83, 101], there is already some tension between this natural expectation and the direct searches.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, methodology): “[369] showed that λbs = 0 scenario is already in slight tension with data.”
Simultaneous explanation of the RK and R(D(⁎)) puzzles (2014, unknown): “[83] should be applied as g(33) qV g 33 `V cos 2 θD cos 2 θL ≤ 3 and ∣∣h33 U1 cos θD cos θL∣∣2 ≤ 5 (for ΛNP = 1 TeV).”