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Search for lepton-flavor violating decays of heavy resonances and quantum black holes to eμ final states in proton-proton collisions at $ \sqrt{s}=13 $ TeV

The CMS collaboration
JHEP 1804 (2018) 073, 2018

Abstract (data abstract)
A search is reported for heavy resonances decaying into $e \mu$ final states in proton-proton collisions recorded by the CMS experimentat the CERN LHC at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The search focuses on resonancemasses above 200 GeV. With no evidence found for physics beyond the standard model in the $e \mu$ mass spectrum, upper limits are setat 95% confidence level on the product of the cross section and branching fraction for this lepton-flavor violating signal.Based on these results, resonant $\tau$ sneutrino production in R-parity violating supersymmetric models is excluded formasses below 1.7 TeV, for couplings $\lambda_{132}=\lambda_{231}=\lambda'_{311}=0.01$. Heavy $Z'$ gauge bosons with lepton-flavor violatingtransitions are excluded for masses up to 4.4 TeV.The $e \mu $ mass spectrum is also interpreted in terms of non-resonant contributions from quantum black-holeproduction in models with one to six extra spatial dimensions, and lower mass limits are found between 3.6 and 5.6 TeV.In all interpretations used in this analysis, the results of this search improve previous limits by about 1 TeV.These limits correspond to the most sensitive values obtained at colliders.

  • Expected cross section limit for tau-sneutrino signal

    Data from figure 3 (upper plot)

    10.17182/hepdata.86568.v1/t1

    Expected upper limits at 95% CL on the product of the signal cross section and branching fraction for the tau...

  • Observed cross section limit for tau-sneutrino signal

    Data from figure 3 (upper plot)

    10.17182/hepdata.86568.v1/t2

    Observed upper limits at 95% CL on the product of the signal cross section and branching fraction for the tau-sneutrino...

  • Cross section of RPV tau sneutrino signal

    Data from figure 3

    10.17182/hepdata.86568.v1/t3

    Cross section of RPV tau-sneutrino as a function of mass. Cross section includes the branching ratio of tau-sneutrino decaying to...

  • Observed and expected cross section limit for QBH signal

    Data from figure 4

    10.17182/hepdata.86568.v1/t4

    Observed and expected upper limits at 95% CL on the median product of the signal cross section and the branching...

  • Cross section of QBH signal

    Data from figure 4

    10.17182/hepdata.86568.v1/t5

    Cross section of QBH as a function of mass. The cross section includes the branching ratio of QBH decaying to...

  • Observed and expected cross section limit for Zprime signal

    Data from figure 5

    10.17182/hepdata.86568.v1/t6

    Observed and expected upper limits at 95% CL on the product of the signal cross section and the branching fraction(B),...

  • Cross section of Zprime signal

    Data from figure 5

    10.17182/hepdata.86568.v1/t7

    Cross section of Z' as a function of mass. The cross sections include branching ratio $BR(Z' -> e \mu) =...

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