Search for scalar leptoquarks in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS experiment

The ATLAS collaboration
New J.Phys. 18 (2016) 093016, 2016.

Abstract (data abstract)
An inclusive search for a new-physics signature of lepton-jet resonances has been performed by the ATLAS experiment. Scalar leptoquarks, pair-produced in $pp$ collisions at $\sqrt{s}$ = 13 TeV at the Large Hadron Collider have been considered. An integrated luminosity of 3.2 fb$^{-1}$, corresponding to the full 2015 dataset was used. First (second) generation leptoquarks were sought in events with two electrons (muons) and two or more jets. The observed yield in each channel is consistent with Standard Model background expectations. The observed (expected) leptoquark mass limits at 95% confidence level are 1100 GeV and 1050 GeV (1160 GeV and 1040 GeV) for first and second generation leptoquarks, respectively, assuming a branching ratio into a charged lepton and a quark of 100%. Upper limits on the aforementioned branching ratio are also given as a function of leptoquark mass. Compared with the results of earlier ATLAS searches, the sensitivity is increased for the higher range of accessible leptoquark masses, and the observed exclusion limits confirm and extend the published results.

  • Table 1

    Data from Table 1


    Normalisation factors for the main backgrounds obtained from the combined fit in each of the channels. The total uncertainty is...

  • Table 2

    Data from Figures 4, 6a, 9a


    Search for the first generation leptoquarks (LQs). Event yields in the Z control region (CR), ttbar CR and in the...

  • Table 3

    Data from Figures 4, 6b, 9b


    Search for the second generation leptoquarks (LQs). Event yields in the Z control region (CR), ttbar CR and in the...

  • Table 4

    Data from Table 5


    NLO cross sections and selection efficiencies (assuming $\beta$ = 1) for different signal points.

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