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} \to c {\tilde{χ}}_{1}^{0}

{\tilde{t}}_{1} \to t {\tilde{χ}}_{1}^{0}

, where the

{\tilde{χ}}_{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

t c + E_{T}^{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})

m ({\tilde{χ}}_{1}^{0})

plane and, in addition, limits on the branching ratio of the

{\tilde{t}}_{1} \to t {\tilde{χ}}_{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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 $1 σ$ 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 $2 σ$ 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 $({\tilde{t}}_{1} \to t + {\tilde{χ}}_{1}^{0})$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ mass plane, assuming $m_{{\tilde{χ}}_{1}^{0}} = 1 GeV$ ...
br_m1_obs_minus

Data from fig. 10.

10.17182/hepdata.144439.v1/t10

Observed exclusion limits at the 95% CL in the ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ mass plane, assuming $m_{{\tilde{χ}}_{1}^{0}} = 1 GeV$ ...
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 $({\tilde{t}}_{1} \to t + {\tilde{χ}}_{1}^{0})$ plane, assuming $m_{\tilde\chi^0_1} =...
br_m1_band_1

Data from fig. 10.

10.17182/hepdata.144439.v1/t12

The $1 σ$ 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 $2 σ$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ ...
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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ ...
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 $N_{tops}^{DNN} (R = 1.0)$ 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 $m_{T 2} (j_{R = 1.0}^{b}, c)$ 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 $p_{T} (c_{1})$ 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 $m_{T} (j, E_{T}^{miss})_{close}$ 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 $E_{T}^{miss} Significance$ 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 $m_{T} (j, E_{T}^{miss})_{close}$ 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 $m_{eff}$ 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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 $(m_{{\tilde{t}}_{1}}, m_{{\tilde{χ}}_{1}^{0}}) =$ (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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ 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 ${\tilde{t}}_{1} - {\tilde{χ}}_{1}^{0}$ mass plane, assuming BR$(\tilde{t}_1 \rightarrow t + \tilde\chi^0_1) =...

Overview

mass_obs

mass_obs_plus

mass_obs_minus

mass_exp

mass_band_1

mass_band_2

br_m1_obs

br_m1_obs_plus

br_m1_obs_minus

br_m1_exp

br_m1_band_1

br_m1_band_2

mass_upperLimits_obs

mass_upperLimits_exp

br_m1_upperLimits_obs

br_m1_upperLimits_exp

SRA_ntop

SRA_mttwo

SRB_ptc

SRB_mtj

SRC_metsig

SRC_mtj

SRD_NN

SRD_meff

SRABCPull

SRDPull

cutflow_SRA

cutflow_SRB

cutflow_SRC

cutflow_SRD750

cutflow_SRD1000

cutflow_SRD1250

cutflow_SRD1500

cutflow_SRD1750

cutflow_SRD2000

Acc_SRA_bin1

Eff_SRA_bin1

Acc_SRA_bin2

Eff_SRA_bin2

Acc_SRB_bin1

Eff_SRB_bin1

Acc_SRB_bin2

Eff_SRB_bin2

Acc_SRB_bin3

Eff_SRB_bin3

Acc_SRC_bin1

Eff_SRC_bin1

Acc_SRC_bin2

Eff_SRC_bin2

Acc_SRC_bin3

Eff_SRC_bin3

Acc_SRC_bin4

Eff_SRC_bin4

Acc_SRD_bin1

Eff_SRD_bin1

Acc_SRD_bin2

Eff_SRD_bin2

Acc_SRD_bin3

Eff_SRD_bin3

Acc_SRD_bin4

Eff_SRD_bin4

Acc_SRD_bin5

Eff_SRD_bin5

Acc_SRD_bin6

Eff_SRD_bin6

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