Search for a scalar partner of the top quark in the all-hadronic $t\bar{t}$ plus missing transverse momentum final state at $\sqrt{s}$=13 TeV with the ATLAS detector

The ATLAS collaboration
2020.

Abstract
A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic $t\bar{t}$ plus missing transverse momentum final state is presented. The analysis of 139 fb$^{-1}$ of $\sqrt{s}$=13 TeV proton-proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via $\tilde{t} \to t^{(*)} \tilde{\chi}^0_1$, with $t^{(*)}$ denoting an on-shell (off-shell) top quark and $\tilde{\chi}^0_1$ the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where $m_{\tilde{t}}> m_t+m_{\tilde{\chi}^0_1}$, top squark masses are excluded in the range 400-1250 GeV for $\tilde{\chi}^0_1$ masses below 200 GeV at 95% confidence level. In the situation where $m_{\tilde{t}}\sim m_t+m_{\tilde{\chi}^0_1}$, top squark masses in the range 300-630 GeV are excluded, while in the case where $m_{\tilde{t}}< m_W+m_b+m_{\tilde{\chi}^0_1}$ (with $m_{\tilde{t}}-m_{\tilde{\chi}^0_1}\ge$ 5 GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300-660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino.

  • Overview

    10.17182/hepdata.93906.v1/t1

    <b>- - - - - - - - Overview of HEPData Record - - - - - - - -</b>...

  • stop_obs

    Data from fig. 13a.

    10.17182/hepdata.93906.v1/t2

    The observed exclusion contour at 95% CL as a function of the $\it{m}_{\tilde{\chi}^{0}_{1}}$ vs. $\it{m}_{\tilde{t}}$. Masses that are within the...

  • stop_exp

    Data from fig. 13a.

    10.17182/hepdata.93906.v1/t3

    The expected exclusion contour at 95% CL as a function of the $\it{m}_{\tilde{\chi}^{0}_{1}}$ vs. $\it{m}_{\tilde{t}}$. Masses that are within the...

  • stop_obs_down

    Data from fig. 13a.

    10.17182/hepdata.93906.v1/t4

    The minus $1\sigma$ variation of observed exclusion contour obtained by varying the signal cross section within its uncertainty. The contour...

  • stop_obs_up

    Data from fig. 13a.

    10.17182/hepdata.93906.v1/t5

    The plus $1\sigma$ variation of observed exclusion contour obtained by varying the signal cross section within its uncertainty. The contour...

  • stop_exp_down

    Data from fig. 13a.

    10.17182/hepdata.93906.v1/t6

    The minus $1\sigma$ variation of expected exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical uncertainties...

  • stop_exp_up

    Data from fig. 13a.

    10.17182/hepdata.93906.v1/t7

    The plus $1\sigma$ variation of expected exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical uncertainties...

  • LQ3u_obs

    Data from fig. 14a.

    10.17182/hepdata.93906.v1/t8

    The observed exclusion contour at 95% CL as a function of the $\it{m}_{LQ_{3}^{u}}$ vs. $\mathrm{BR}(\it{m}_{LQ_{3}^{u}}\rightarrow b \tau)$. Points that are...

  • LQ3u_exp

    Data from fig. 14a.

    10.17182/hepdata.93906.v1/t9

    The expected exclusion contour at 95% CL as a function of the $\it{m}_{LQ_{3}^{u}}$ vs. $\mathrm{BR}(\it{m}_{LQ_{3}^{u}}\rightarrow b \tau)$. Points that are...

  • LQ3u_obs_down

    Data from fig. 14a.

    10.17182/hepdata.93906.v1/t10

    The minus $1\sigma$ variation of observed exclusion contour obtained by varying the signal cross section within its uncertainty. The contour...

  • LQ3u_obs_up

    Data from fig. 14a.

    10.17182/hepdata.93906.v1/t11

    The plus $1\sigma$ variation of observed exclusion contour obtained by varying the signal cross section within its uncertainty. The contour...

  • LQ3u_exp_up

    Data from fig. 14a.

    10.17182/hepdata.93906.v1/t12

    The plus $1\sigma$ variation of expected exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical uncertainties...

  • LQ3u_exp_down

    Data from fig. 14a.

    10.17182/hepdata.93906.v1/t13

    The minus $1\sigma$ variation of expected exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical uncertainties...

  • stop_xSecUpperLimit_obs

    Data from figaux. 01a and 01b.

    10.17182/hepdata.93906.v1/t14

    Model dependent upper limit on the cross section for the $(\tilde{t},\tilde{\chi}^{0}_{1})$ signal grid. The column titled 'Leading Region' stores information...

  • stop_xSecUpperLimit_exp

    Data from figaux. 02a and 02b.

    10.17182/hepdata.93906.v1/t15

    Expected model dependent upper limit on the cross section for the $(\tilde{t},\tilde{\chi}^{0}_{1})$ signal grid. The column titled 'Leading Region' stores...

  • LQ3u_xSecUpperLimit_obs

    Data from fig. 14b.

    10.17182/hepdata.93906.v1/t16

    Model dependent upper limit on the cross section for the $LQ_{3}^{u}$ signal grid with $\mathrm{BR}(\it{m}_{LQ_{3}^{u}}\rightarrow b \tau))=0$ %. Only the...

  • LQ3u_xSecUpperLimit_exp

    Data from fig. 14b.

    10.17182/hepdata.93906.v1/t17

    Expected model dependent upper limit on the cross section for the $LQ_{3}^{u}$ signal grid with $\mathrm{BR}(\it{m}_{LQ_{3}^{u}}\rightarrow b \tau))=0$ %. Only...

  • SRATW_metsigST

    Data from fig. 12a.

    10.17182/hepdata.93906.v1/t18

    The distributions of $S$ in SRA-TW. For each bin yields for the data, total SM prediction and a representative signal...

  • SRBTT_m_1fatjet_kt12

    Data from fig. 12b.

    10.17182/hepdata.93906.v1/t19

    The distributions of $\it{m}^{\mathrm{R=1.2}}_{1}$ in SRB-TT. For each bin yields for the data, total SM prediction and a representative signal...

  • SRC_RISR

    Data from fig. 12c.

    10.17182/hepdata.93906.v1/t20

    The distributions of R$_{ISR}$ in SRC signal regions before R$_{ISR}$ cuts are applied. For each bin yields for the data,...

  • SRD0_htSig

    Data from fig. 12d.

    10.17182/hepdata.93906.v1/t21

    The distributions of $E^{miss}_{T}/\sqrt{H_{T}}$ in SRD0. For each bin yields for the data, total SM prediction and a representative signal...

  • SRD1_htSig

    Data from fig. 12e.

    10.17182/hepdata.93906.v1/t22

    The distributions of $E^{miss}_{T}/\sqrt{H_{T}}$ in SRD1. For each bin yields for the data, total SM prediction and a representative signal...

  • SRD2_htSig

    Data from fig. 12f.

    10.17182/hepdata.93906.v1/t23

    The distributions of $E^{miss}_{T}/\sqrt{H_{T}}$ in SRD2. For each bin yields for the data, total SM prediction and a representative signal...

  • cutflow_SRATT

    Data from tabaux. 01.

    10.17182/hepdata.93906.v1/t24

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (1300,1)\ \mathrm{GeV} $ in SRA-TT. The column labelled ''Weighted yield'' shows the results...

  • cutflow_SRATW

    Data from tabaux. 02.

    10.17182/hepdata.93906.v1/t25

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (1300,1)\ \mathrm{GeV} $ in SRA-TW. The column labelled ''Weighted yield'' shows the results...

  • cutflow_SRAT0

    Data from tabaux. 03.

    10.17182/hepdata.93906.v1/t26

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (1300,1)\ \mathrm{GeV} $ in SRA-T0. The column labelled ''Weighted yield'' shows the results...

  • cutflow_SRB

    Data from tabaux. 04.

    10.17182/hepdata.93906.v1/t27

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (700,400)\ \mathrm{GeV} $ in signal regions SRB-TT, SRB-TW and SRB-T0. The regions differ...

  • cutflow_SRC

    Data from tabaux. 05.

    10.17182/hepdata.93906.v1/t28

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (500,327)\ \mathrm{GeV} $ in regions SRC-1, SRC-2, SRC-3, SRC-4 and SRC-5. The regions...

  • cutflow_SRD0

    Data from tabaux. 06.

    10.17182/hepdata.93906.v1/t29

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (550,500)\ \mathrm{GeV} $ in SRD0. The column labelled ''Weighted yield'' shows the results...

  • cutflow_SRD1

    Data from tabaux. 07.

    10.17182/hepdata.93906.v1/t30

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (550,500)\ \mathrm{GeV} $ in SRD1. The column labelled ''Weighted yield'' shows the results...

  • cutflow_SRD2

    Data from tabaux. 08.

    10.17182/hepdata.93906.v1/t31

    Cutflow for the reference point $(\it{m}_{\tilde{t}}, \it{m}_{\tilde{\chi}^{0}_{1}})= (550,500)\ \mathrm{GeV} $ in SRD2. The column labelled ''Weighted yield'' shows the results...

  • Acc_SRATT

    Data from figaux 03a.

    10.17182/hepdata.93906.v1/t32

    Signal acceptance in SRA-TT for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRATT

    Data from figaux 03b.

    10.17182/hepdata.93906.v1/t33

    Signal efficiency in SRA-TT for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %.

  • Acc_SRATW

    Data from figaux 04a.

    10.17182/hepdata.93906.v1/t34

    Signal acceptance in SRA-TW for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRATW

    Data from figaux 04b.

    10.17182/hepdata.93906.v1/t35

    Signal efficiency in SRA-TW for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %.

  • Acc_SRAT0

    Data from figaux 05a.

    10.17182/hepdata.93906.v1/t36

    Signal acceptance in SRA-T0 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRAT0

    Data from figaux 05b.

    10.17182/hepdata.93906.v1/t37

    Signal efficiency in SRA-T0 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %.

  • Acc_SRBTT

    Data from figaux 06a.

    10.17182/hepdata.93906.v1/t38

    Signal acceptance in SRB-TT for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRBTT

    Data from figaux 06b.

    10.17182/hepdata.93906.v1/t39

    Signal efficiency in SRB-TT for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %.

  • Acc_SRBTW

    Data from figaux 07a.

    10.17182/hepdata.93906.v1/t40

    Signal acceptance in SRB-TW for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRBTW

    Data from figaux 07b.

    10.17182/hepdata.93906.v1/t41

    Signal efficiency in SRB-TW for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %.

  • Acc_SRBT0

    Data from figaux 08a.

    10.17182/hepdata.93906.v1/t42

    Signal acceptance in SRB-T0 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRBT0

    Data from figaux 08b.

    10.17182/hepdata.93906.v1/t43

    Signal efficiency in SRB-T0 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %.

  • Acc_SRC1

    Data from figaux 09a.

    10.17182/hepdata.93906.v1/t44

    Signal acceptance in SRC1 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRC1

    Data from figaux 09b.

    10.17182/hepdata.93906.v1/t45

    Signal efficiency in SRC1 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRC2

    Data from figaux 10a.

    10.17182/hepdata.93906.v1/t46

    Signal acceptance in SRC2 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRC2

    Data from figaux 10b.

    10.17182/hepdata.93906.v1/t47

    Signal efficiency in SRC2 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRC3

    Data from figaux 11a.

    10.17182/hepdata.93906.v1/t48

    Signal acceptance in SRC3 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRC3

    Data from figaux 11b.

    10.17182/hepdata.93906.v1/t49

    Signal efficiency in SRC3 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRC4

    Data from figaux 12a.

    10.17182/hepdata.93906.v1/t50

    Signal acceptance in SRC4 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRC4

    Data from figaux 12b.

    10.17182/hepdata.93906.v1/t51

    Signal efficiency in SRC4 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRC5

    Data from figaux 13a.

    10.17182/hepdata.93906.v1/t52

    Signal acceptance in SRC5 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRC5

    Data from figaux 13b.

    10.17182/hepdata.93906.v1/t53

    Signal efficiency in SRC5 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRD0

    Data from figaux 14a.

    10.17182/hepdata.93906.v1/t54

    Signal acceptance in SRD0 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRD0

    Data from figaux 14b.

    10.17182/hepdata.93906.v1/t55

    Signal efficiency in SRD0 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRD1

    Data from figaux 15a.

    10.17182/hepdata.93906.v1/t56

    Signal acceptance in SRD1 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRD1

    Data from figaux 15b.

    10.17182/hepdata.93906.v1/t57

    Signal efficiency in SRD1 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

  • Acc_SRD2

    Data from figaux 16a.

    10.17182/hepdata.93906.v1/t58

    Signal acceptance in SRD2 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the acceptance given in the table is multiplied by...

  • Eff_SRD2

    Data from figaux 16b.

    10.17182/hepdata.93906.v1/t59

    Signal efficiency in SRD2 for simplified $(\tilde{t},\tilde{\chi^{0}_1})$ model. Please mind that the efficiency in the table is reported in %...

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