Search for top squarks decaying to tau sleptons in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

The ATLAS collaboration
No Journal Information, 2018

Abstract (data abstract)
A search for direct pair production of top squarks in final states with two tau leptons, $b$-jets, and missing transverse momentum is presented. The analysis is based on proton--proton collision data at $\sqrt{s} =$ 13 TeV corresponding to an integrated luminosity of 36.1/fb recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. Two exclusive channels with either two hadronically decaying tau leptons or one hadronically and one leptonically decaying tau lepton are considered. No significant deviation from the Standard Model predictions is observed in the data. The analysis results are interpreted in terms of model-independent limits and used to derive exclusion limits on the masses of the top squark $\tilde t_1$ and the tau slepton $\tilde \tau_1$ in a simplified model of Supersymmetry with a nearly massless gravitino. In this model, masses up to $m(\tilde t_1) =$ 1.16 TeV and $m(\tilde \tau_1) =$ 1.00 TeV are excluded at 95\% confidence level.

  • Table 1

    Data from fig_05a

    10.17182/hepdata.82212.v1/t1

    Distribution of m<sub>T2</sub> in the signal region of the lep-had channel before the respective selection requirements, indicated by the vertical...

  • Table 2

    Data from fig_05b

    10.17182/hepdata.82212.v1/t2

    Distributions of E<sub>T</sub><sup>miss</sup> in the signal region of the lep-had channel before the respective selection requirements, indicated by the vertical...

  • Table 3

    Data from fig_05c

    10.17182/hepdata.82212.v1/t3

    Distributions of m<sub>T2</sub> in the signal region of the had-had channel before the respective selection requirements, indicated by the vertical...

  • Table 4

    Data from fig_05d

    10.17182/hepdata.82212.v1/t4

    Distributions of E<sub>T</sub><sup>miss</sup> in the signal region of the had-had channel before the respective selection requirements, indicated by the vertical...

  • Table 5

    Data from fig_07

    10.17182/hepdata.82212.v1/t5

    <b>Exclusion contour (obs)</b> Expected (solid blue line) and observed (solid red line) exclusion-limit contours at 95% confidence level in the...

  • Table 6

    Data from fig_07

    10.17182/hepdata.82212.v1/t6

    <b>Exclusion contour (exp)</b> Expected (solid blue line) and observed (solid red line) exclusion-limit contours at 95% confidence level in the...

  • Table 7

    Data from tab_07

    10.17182/hepdata.82212.v1/t7

    Expected numbers of events from the SM background processes from the background fit and observed event yield in data for...

  • Table 8

    Data from tab_08

    10.17182/hepdata.82212.v1/t8

    Normalization factors obtained from the background-only fit. The normalization factor for tt&#772; events with fake tau leptons is only relevant...

  • Table 9

    Data from tab_09

    10.17182/hepdata.82212.v1/t9

    Left to right: observed 95% CL upper limits on the visible cross section (&lang; A &epsilon; &sigma; &rang;<sub>obs</sub><sup>95</sup>) and on...

  • Table 10

    Data from figaux_03a

    10.17182/hepdata.82212.v1/t10

    Signal acceptance A in percent for the signal region of the lep-had channel. The signal acceptance A is determined from...

  • Table 11

    Data from figaux_03b

    10.17182/hepdata.82212.v1/t11

    Signal acceptance A in percent for the signal region of the had-had channel. The signal acceptance A is determined from...

  • Table 12

    Data from figaux_03c

    10.17182/hepdata.82212.v1/t12

    Reconstruction efficiency &epsilon; in percent for the signal region of the lep-had channel. The signal acceptance A is determined from...

  • Table 13

    Data from figaux_03d

    10.17182/hepdata.82212.v1/t13

    Reconstruction efficiency &epsilon; in percent for the signal region of the had-had channel. The signal acceptance A is determined from...

  • Table 14

    Data from tabaux_01

    10.17182/hepdata.82212.v1/t14

    Upper exclusion limits at 95% confidence level on the observed cross section &sigma;<sub>obs</sub><sup>95</sup> for the simplified signal model as function...

  • Table 15

    Data from tabaux_02

    10.17182/hepdata.82212.v1/t15

    Number of events passing each selection step of SR LH (lep-had channel) before (raw number) and after applying event-based weights...

  • Table 16

    Data from tabaux_03

    10.17182/hepdata.82212.v1/t16

    Number of events passing each selection step of SR HH (had-had channel) before (raw number) and after applying event-based weights...

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