A search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb$^{-1}$ of $pp$ collision data collected by the ATLAS detector

The ATLAS collaboration
JHEP 07 (2024) 250, 2024.

Abstract
This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and corresponds to an integrated luminosity of 139fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV. The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either $\tilde{t}_1 \rightarrow c\tilde{\chi}_1^0$ or $\tilde{t}_1\rightarrow t\tilde{\chi}_1^0$, where the $\tilde{\chi}_1^0$ is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of $tc + E_{\text{T}}^{\text{miss}}$. Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the $m(\tilde{t}_1)$ vs $m(\tilde{\chi}_1^0)$ plane and, in addition, limits on the branching ratio of the $\tilde{t}_1\rightarrow t\tilde{\chi}_1^0$ decay as a function of $m(\tilde{t}_1)$ are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate.

  • Overview

    10.17182/hepdata.144439.v1/t1

    - - - - - - - - Overview of HEPData Record - - - - - - - -...

  • mass_obs

    Data from fig. 09.

    10.17182/hepdata.144439.v1/t2

    Observed exclusion limits at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • mass_obs_plus

    Data from fig. 09.

    10.17182/hepdata.144439.v1/t3

    Observed exclusion limits at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • mass_obs_minus

    Data from fig. 09.

    10.17182/hepdata.144439.v1/t4

    Observed exclusion limits at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • mass_exp

    Data from fig. 09.

    10.17182/hepdata.144439.v1/t5

    Expected exclusion limits at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • mass_band_1

    Data from fig. 09.

    10.17182/hepdata.144439.v1/t6

    The $1\sigma$ variation of expected 95% CL exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical...

  • mass_band_2

    Data from fig. 09.

    10.17182/hepdata.144439.v1/t7

    The $2\sigma$ variation of expected 95%CL exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical uncertainties...

  • br_m1_obs

    Data from fig. 10.

    10.17182/hepdata.144439.v1/t8

    Observed exclusion limits at the 95% CL in the $m_{\tilde{t}_1} - $BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)$ plane, assuming $m_{\tilde\chi^0_1} =...

  • br_m1_obs_plus

    Data from fig. 10.

    10.17182/hepdata.144439.v1/t9

    Observed exclusion limits at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming $m_{\tilde\chi^0_1} = 1 \mathrm{ GeV}$...

  • br_m1_obs_minus

    Data from fig. 10.

    10.17182/hepdata.144439.v1/t10

    Observed exclusion limits at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming $m_{\tilde\chi^0_1} = 1 \mathrm{ GeV}$...

  • br_m1_exp

    Data from fig. 10.

    10.17182/hepdata.144439.v1/t11

    Expected exclusion limits at the 95% CL in the $m_{\tilde{t}_1} - $BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)$ plane, assuming $m_{\tilde\chi^0_1} =...

  • br_m1_band_1

    Data from fig. 10.

    10.17182/hepdata.144439.v1/t12

    The $1\sigma$ variation of expected 95% CL exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical...

  • br_m1_band_2

    Data from fig. 10.

    10.17182/hepdata.144439.v1/t13

    The $2\sigma$ variation of expected 95%CL exclusion contour obtained by varying MC statistical uncertainties, detector-related systematic uncertainties, and theoretical uncertainties...

  • mass_upperLimits_obs

    Data used in figaux. 16a.

    10.17182/hepdata.144439.v1/t14

    Observed upper limits on the top-spartner pair production cross-section in fb at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$...

  • mass_upperLimits_exp

    Data used in figaux. 16b.

    10.17182/hepdata.144439.v1/t15

    Expected upper limits on the top-spartner pair production cross-section in fb at the 95% CL in the $\tilde{t}_1 - \tilde\chi^0_1$...

  • br_m1_upperLimits_obs

    Data used in figaux. 17a.

    10.17182/hepdata.144439.v1/t16

    Observed upper limits on the top-spartner pair production cross-section in fb at the 95% CL in the $m_{\tilde{t}_1} - $BR$(\tilde{t}_1...

  • br_m1_upperLimits_exp

    Data used in figaux. 17b.

    10.17182/hepdata.144439.v1/t17

    Expected upper limits on the top-spartner pair production cross-section in fb at the 95% CL in the $m_{\tilde{t}_1} - $BR$(\tilde{t}_1...

  • SRA_ntop

    Data from fig. 07a.

    10.17182/hepdata.144439.v1/t18

    Post-fit distribution of $N_{\mathrm{tops}}^{\mathrm{DNN}} (\mathrm{R=1.0})$ in the SRA signal region presented without the associated SRA applied to the variable. For...

  • SRA_mttwo

    Data from fig. 07b.

    10.17182/hepdata.144439.v1/t19

    Post-fit distribution of $m_{\mathrm{T2}}(j^{b}_{R=1.0}, c)$ in the SRA signal region presented without the associated SRA applied to the variable. For...

  • SRB_ptc

    Data from fig. 07c.

    10.17182/hepdata.144439.v1/t20

    Post-fit distribution of $p_{\mathrm{T}}(c_{1})$ in the SRB signal region presented without the associated SRB applied to the variable. For each...

  • SRB_mtj

    Data from fig. 07d.

    10.17182/hepdata.144439.v1/t21

    Post-fit distribution of $m_{\mathrm{T}}(j, \mathrm{E}_{\mathrm{T}}^{\mathrm{miss}})_{\mathrm{close}}$ in the SRB signal region presented without the associated SRB applied to the variable. For...

  • SRC_metsig

    Data from fig. 08a.

    10.17182/hepdata.144439.v1/t22

    Post-fit distribution of $\mathrm{E}_{\mathrm{T}}^{\mathrm{miss}} \textrm{Significance}$ in the SRC signal region presented without the associated SRC applied to the variable. For...

  • SRC_mtj

    Data from fig. 08b.

    10.17182/hepdata.144439.v1/t23

    Post-fit distribution of $m_{\mathrm{T}}(j, \mathrm{E}_{\mathrm{T}}^{\mathrm{miss}})_{\mathrm{close}}$ in the SRC signal region presented without the associated SRC applied to the variable. For...

  • SRD_NN

    Data from fig. 08c.

    10.17182/hepdata.144439.v1/t24

    Post-fit distribution of NN signal score in the SRD signal region presented without the associated SRD applied to the variable....

  • SRD_meff

    Data from fig. 08d.

    10.17182/hepdata.144439.v1/t25

    Post-fit distribution of $m_{\mathrm{eff}}$ in the SRD signal region. For each bin yields for the data and total SM prediction...

  • SRABCPull

    Data from fig. 05.

    10.17182/hepdata.144439.v1/t26

    Pull plots showing the SRA, SRB and SRC post-fit data and SM agreement using the background-only fit configuration

  • SRDPull

    Data from fig. 06.

    10.17182/hepdata.144439.v1/t27

    Pull plots showing the SRD post-fit data and SM agreement using the background-only fit configuration

  • cutflow_SRA

    Data from tabaux. 01.

    10.17182/hepdata.144439.v1/t28

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region A. Results are shown including...

  • cutflow_SRB

    Data from tabaux. 02.

    10.17182/hepdata.144439.v1/t29

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region B. Results are shown including...

  • cutflow_SRC

    Data from tabaux. 03.

    10.17182/hepdata.144439.v1/t30

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region C. Results are shown including...

  • cutflow_SRD750

    Data from tabaux. 04.

    10.17182/hepdata.144439.v1/t31

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region D 750. Results are shown...

  • cutflow_SRD1000

    Data from tabaux. 04.

    10.17182/hepdata.144439.v1/t32

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region D 1000. Results are shown...

  • cutflow_SRD1250

    Data from tabaux. 04.

    10.17182/hepdata.144439.v1/t33

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region D 1250. Results are shown...

  • cutflow_SRD1500

    Data from tabaux. 04.

    10.17182/hepdata.144439.v1/t34

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region D 1500. Results are shown...

  • cutflow_SRD1750

    Data from tabaux. 04.

    10.17182/hepdata.144439.v1/t35

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region D 1750. Results are shown...

  • cutflow_SRD2000

    Data from tabaux. 04.

    10.17182/hepdata.144439.v1/t36

    Cutflow for the reference point $(m_{\tilde{t}_1}, m_{\tilde\chi^0_1})=$ (900,1) , (700,300), (550,375) in the Signal region D 2000. Results are shown...

  • Acc_SRA_bin1

    Data from figaux 01a.

    10.17182/hepdata.144439.v1/t37

    Signal acceptance in the SRA$^{[450,575]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRA_bin1

    Data from figaux 01b.

    10.17182/hepdata.144439.v1/t38

    Signal efficiency in the SRA$^{[450,575]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRA_bin2

    Data from figaux 02a.

    10.17182/hepdata.144439.v1/t39

    Signal acceptance in the SRA$^{\geq 575}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • Eff_SRA_bin2

    Data from figaux 02b.

    10.17182/hepdata.144439.v1/t40

    Signal efficiency in the SRA$^{\geq 575}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • Acc_SRB_bin1

    Data from figaux 03a.

    10.17182/hepdata.144439.v1/t41

    Signal acceptance in the SRB$^{[100,150]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRB_bin1

    Data from figaux 03b.

    10.17182/hepdata.144439.v1/t42

    Signal efficiency in the SRB$^{[100,150]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRB_bin2

    Data from figaux 04a.

    10.17182/hepdata.144439.v1/t43

    Signal acceptance in the SRB$^{[150,400]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRB_bin2

    Data from figaux 04b.

    10.17182/hepdata.144439.v1/t44

    Signal efficiency in the SRB$^{[150,400]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRB_bin3

    Data from figaux 05a.

    10.17182/hepdata.144439.v1/t45

    Signal acceptance in the SRB$^{\geq 400}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • Eff_SRB_bin3

    Data from figaux 05b.

    10.17182/hepdata.144439.v1/t46

    Signal efficiency in the SRB$^{\geq 400}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • Acc_SRC_bin1

    Data from figaux 06a.

    10.17182/hepdata.144439.v1/t47

    Signal acceptance in the SRC$^{[100,150]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRC_bin1

    Data from figaux 06b.

    10.17182/hepdata.144439.v1/t48

    Signal efficiency in the SRC$^{[100,150]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRC_bin2

    Data from figaux 07a.

    10.17182/hepdata.144439.v1/t49

    Signal acceptance in the SRC$^{[150,300]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRC_bin2

    Data from figaux 07b.

    10.17182/hepdata.144439.v1/t50

    Signal efficiency in the SRC$^{[150,300]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRC_bin3

    Data from figaux 08a.

    10.17182/hepdata.144439.v1/t51

    Signal acceptance in the SRC$^{[300,500]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRC_bin3

    Data from figaux 08b.

    10.17182/hepdata.144439.v1/t52

    Signal efficiency in the SRC$^{[300,500]}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRC_bin4

    Data from figaux 09a.

    10.17182/hepdata.144439.v1/t53

    Signal acceptance in the SRC$^{\geq 500}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • Eff_SRC_bin4

    Data from figaux 09b.

    10.17182/hepdata.144439.v1/t54

    Signal efficiency in the SRC$^{\geq 500}$ region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1)...

  • Acc_SRD_bin1

    Data from figaux 10a.

    10.17182/hepdata.144439.v1/t55

    Signal acceptance in the SRD750 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRD_bin1

    Data from figaux 10b.

    10.17182/hepdata.144439.v1/t56

    Signal efficiency in the SRD750 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRD_bin2

    Data from figaux 11a.

    10.17182/hepdata.144439.v1/t57

    Signal acceptance in the SRD1000 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRD_bin2

    Data from figaux 11b.

    10.17182/hepdata.144439.v1/t58

    Signal efficiency in the SRD1000 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRD_bin3

    Data from figaux 12a.

    10.17182/hepdata.144439.v1/t59

    Signal acceptance in the SRD1250 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRD_bin3

    Data from figaux 12b.

    10.17182/hepdata.144439.v1/t60

    Signal efficiency in the SRD1250 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRD_bin4

    Data from figaux 13a.

    10.17182/hepdata.144439.v1/t61

    Signal acceptance in the SRD1500 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRD_bin4

    Data from figaux 13b.

    10.17182/hepdata.144439.v1/t62

    Signal efficiency in the SRD1500 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRD_bin5

    Data from figaux 14a.

    10.17182/hepdata.144439.v1/t63

    Signal acceptance in the SRD1750 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRD_bin5

    Data from figaux 14b.

    10.17182/hepdata.144439.v1/t64

    Signal efficiency in the SRD1750 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Acc_SRD_bin6

    Data from figaux 15a.

    10.17182/hepdata.144439.v1/t65

    Signal acceptance in the SRD2000 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

  • Eff_SRD_bin6

    Data from figaux 15b.

    10.17182/hepdata.144439.v1/t66

    Signal efficiency in the SRD2000 region in the $\tilde{t}_1 - \tilde\chi^0_1$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

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