Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector

The ATLAS collaboration
2020.

Abstract (data abstract)
A search for new physics resonances decaying into a lepton and a jet performed by the ATLAS experiment is presented. Scalar leptoquarks pair-produced in (pp) collisions at $\sqrt{s}=13$ TeV at the Large Hadron Collider have been considered using an integrated luminosity of 139 fb$^{-1}$, corresponding to the full Run 2 dataset. They are searched for in events with two electrons or two muons and two or more jets, including jets identified as arising from the fragmentation of $c$- or $b$-quarks. The observed yield in each channel is consistent with the Standard Model background expectation. Leptoquarks with masses below 1.8 TeV and 1.7 TeV are excluded in the electron and muon channels, respectively, assuming a branching ratio into a charged lepton and a quark of 100%, with minimal dependency on the quark flavour. Upper limits on the aforementioned branching ratio are also given as a function of the leptoquark mass.

  • Figure 3a

    Data from Figure 3a

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    Distribution of the resonance mass in the pretag Signal Region of the $ qe$ channel for the post-fit background, the...

  • Figure 3b

    Data from Figure 3b

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    Distribution of the resonance mass in the pretag Signal Region of the $ q\mu$ channel for the post-fit background, the...

  • Figure 4a

    Data from Figure 4a

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    Distribution of the resonance mass in the untagged Signal Region of the $ ce$ channel for the post-fit background, the...

  • Figure 4b

    Data from Figure 4b

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    Distribution of the resonance mass in the c-tag Signal Region of the $ ce$ channel for the post-fit background, the...

  • Figure 4c

    Data from Figure 4c

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    Distribution of the resonance mass in the b-tag Signal Region of the $ ce$ channel for the post-fit background, the...

  • Figure 5a

    Data from Figure 5a

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    Distribution of the resonance mass in the untagged Signal Region of the $ c\mu$ channel for the post-fit background, the...

  • Figure 5b

    Data from Figure 5b

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    Distribution of the resonance mass in the c-tag Signal Region of the $ c\mu$ channel for the post-fit background, the...

  • Figure 5c

    Data from Figure 5c

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    Distribution of the resonance mass in the b-tag Signal Region of the $ c\mu$ channel for the post-fit background, the...

  • Figure 6a

    Data from Figure 6a

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    Distribution of the resonance mass in the 0-tag Signal Region of the $ be$ channel for the post-fit background, the...

  • Figure 6b

    Data from Figure 6b

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    Distribution of the resonance mass in the 1-tag Signal Region of the $ be$ channel for the post-fit background, the...

  • Figure 6c

    Data from Figure 6c

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    Distribution of the resonance mass in the 2-tag Signal Region of the $ be$ channel for the post-fit background, the...

  • Figure 7a

    Data from Figure 7a

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    Distribution of the resonance mass in the 0-tag Signal Region of the $ b\mu$ channel for the post-fit background, the...

  • Figure 7b

    Data from Figure 7b

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    Distribution of the resonance mass in the 1-tag Signal Region of the $ b\mu$ channel for the post-fit background, the...

  • Figure 7c

    Data from Figure 7c

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    Distribution of the resonance mass in the 2-tag Signal Region of the $ b\mu$ channel for the post-fit background, the...

  • Figure 8a

    Data from Figure 8a

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    The observed and expected limits on the leptoquark pair production cross-section at 95% CL for $\mathcal{B}=1$ into electrons, shown as...

  • Figure 8b

    Data from Figure 8b

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    The observed and expected limits on the leptoquark pair production cross-section at 95% CL for $\mathcal{B}=1$ into muons, shown as...

  • Figure 8c

    Data from Figure 8c

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    The observed and expected limits on the leptoquark pair production cross-section at 95% CL for $\mathcal{B}=1$ into electrons, shown as...

  • Figure 8d

    Data from Figure 8d

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    The observed and expected limits on the leptoquark pair production cross-section at 95% CL for $\mathcal{B}=1$ into muons, shown as...

  • Figure 8e

    Data from Figure 8e

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    The observed and expected limits on the leptoquark pair production cross-section at 95% CL for $\mathcal{B}=1$ into electrons, shown as...

  • Figure 8f

    Data from Figure 8f

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    The observed and expected limits on the leptoquark pair production cross-section at 95% CL for $\mathcal{B}=1$ into muons, shown as...

  • Figure 9a

    Data from Figure 9a

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    The observed and expected limits on the leptoquark branching ratio at 95% CL, shown as a function of $m_{LQ}$ for...

  • Figure 9b

    Data from Figure 9b

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    The observed and expected limits on the leptoquark branching ratio at 95% CL, shown as a function of $m_{LQ}$ for...

  • Figure 9c

    Data from Figure 9c

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    The observed and expected limits on the leptoquark branching ratio at 95% CL, shown as a function of $m_{LQ}$ for...

  • Figure 9d

    Data from Figure 9d

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    The observed and expected limits on the leptoquark branching ratio at 95% CL, shown as a function of $m_{LQ}$ for...

  • Figure 9e

    Data from Figure 9e

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    The observed and expected limits on the leptoquark branching ratio at 95% CL, shown as a function of $m_{LQ}$ for...

  • Figure 9f

    Data from Figure 9f

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    The observed and expected limits on the leptoquark branching ratio at 95% CL, shown as a function of $m_{LQ}$ for...

  • AuxTable 01

    Data from Table 01 of auxiliary material.

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    The signal selection efficiency x acceptance summed over all signal regions, for all masses and LQ decay channels considered.

  • AuxTable 02

    Data from Table 02 of auxiliary material.

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    The observed and expected limits for all masses and LQ decay channels considered.

  • AuxTable 03

    Data from Table 03 of auxiliary material.

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    Cutflow Table in the electron channel, considering signal samples with LQ mass of 1 TeV.

  • AuxTable 04

    Data from Table 04 of auxiliary material.

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    Cutflow Table in the muon channel, considering signal samples with LQ mass of 1 TeV.

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