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Search for a singly produced third-generation scalar leptoquark decaying to a $\tau$ lepton and a bottom quark in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
JHEP 1807 (2018) 115, 2018

Abstract (data abstract)
A search is presented for a singly produced third-generation scalar leptoquark decaying to a tau lepton and a bottom quark. Associated production of a leptoquark and a tau lepton is considered, leading to a final state with a bottom quark and two tau leptons. The search uses proton-proton collision data at a center-of-mass energy of 13 TeV recorded with the CMS detector, corresponding to an integrated luminosity of 35.9 fb−1. Upper limits are set at 95% confidence level on the production cross section of the third-generation scalar leptoquarks as a function of their mass. From a comparison of the results with the theoretical predictions, a third-generation scalar leptoquark decaying to a tau lepton and a bottom quark, assuming unit Yukawa coupling (lambda), is excluded for masses below 740 GeV. Limits are also set on lambda of the hypothesized leptoquark as a function of its mass. Above lambda = 1.4, this result provides the best upper limit on the mass of a third-generation scalar leptoquark decaying to a tau lepton and a bottom quark.

  • Acceptance

    Data from Figure 2

    10.17182/hepdata.84396.v1/t1

    The product of acceptance, efficiency, and branching fraction as a function of leptoquark (LQ) mass for the single production of...

  • Event yields in the e-tau signal region

    Data from Figure 3 (upper left)

    10.17182/hepdata.84396.v1/t2

    Observed ST distribution in the e-tau signal region, compared to the expected SM background contributions. The distribution labeled electroweak contains...

  • Event yields in the mu-tau signal region

    Data from Figure 3 (upper right)

    10.17182/hepdata.84396.v1/t3

    Observed ST distribution in the mu-tau signal region, compared to the expected SM background contributions. The distribution labeled electroweak contains...

  • Event yields in the tau-tau signal region

    Data from Figure 3 (lower left)

    10.17182/hepdata.84396.v1/t4

    Observed ST distribution in the tau-tau signal region, compared to the expected SM background contributions. The distribution labeled electroweak contains...

  • Event yields in the e-mu control region

    Data from Figure 3 (lower right)

    10.17182/hepdata.84396.v1/t5

    Observed ST distribution in the e-mu control region, compared to the expected SM background contributions. The distribution labeled electroweak contains...

  • Bin covariance matrix

    Covariance matrix for the data from Figure 3.

    10.17182/hepdata.84396.v1/t6

    The covariance matrix of the bin contents of the background fit. em stands for e-mu channel, et for e-tau channel,...

  • Exclusion limits

    Data from Figure 4

    10.17182/hepdata.84396.v1/t7

    Observed (black solid) and expected (black dotted) limits at 95% confidence level on the product of cross section (sigma) and...

  • lambda vs mass exclusion limits

    Data from Figure 5

    10.17182/hepdata.84396.v1/t8

    Expected and observed exclusion limits at 95% confidence level on the Yukawa coupling (lambda) at the leptoquark(LQ)-lepton-quark vertex, as a...

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