Search for cascade decays of charged sleptons and sneutrinos in final states with three leptons and missing transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
Phys.Rev.D 112 (2025) 012005, 2025.

Abstract
A search for cascade decays of charged sleptons and sneutrinos using final states characterized by three leptons (electrons or muons) and missing transverse momentum is presented. The analysis is based on a dataset with 140 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of $\sqrt{s}$=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. This paper focuses on a supersymmetric scenario that is motivated by the muon anomalous magnetic moment observation, dark mattter relic density abundance, and electroweak naturalness. A mass spectrum involving light higgsinos and heavier sleptons with a bino at intermediate mass is targeted. No significant deviation from the Standard Model expectation is observed. This search enables to place stringent constraints on this model, excluding at the 95% confidence level charged slepton and sneutrino masses up to 450 GeV when assuming a lightest neutralino mass of 100 GeV and mass-degenerate selectrons, smuons and sneutrinos.

  • Kinematics in SROS-on-$eee$

    Data from Fig. 14a

    10.17182/hepdata.157553.v1/t1

    Distribution of $m_{3\ell}$ in SROS-on-$eee$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics in SROS-on-$e\mu\mu$

    Data from Fig. 14b

    10.17182/hepdata.157553.v1/t2

    Distribution of $m_{3\ell}$ in SROS-on-$e\mu\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics in SROS-on-b-$eee$

    Data from Fig. 14c

    10.17182/hepdata.157553.v1/t3

    Distribution of $E_{\text{T}}^{\text{miss}}$ in SROS-on-b-$eee$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics 1 in SROS-on-b-$e\mu\mu$

    Data from Fig. 14d

    10.17182/hepdata.157553.v1/t4

    Distribution of $E_{\text{T}}^{\text{miss}}$ in SROS-on-b-$e\mu\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics 2 in SROS-on-b-$e\mu\mu$

    Data from Fig. 14e

    10.17182/hepdata.157553.v1/t5

    Distribution of $m_{\text{T}}^{\text{min}}$ in SROS-on-b-$e\mu\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics in SRSS-$2\mu$

    Data from Fig. 14f

    10.17182/hepdata.157553.v1/t6

    Distribution of $E_{\text{T}}^{\text{miss}}$ in SRSS-$2\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Results of discovery fits

    Data from Table 8

    10.17182/hepdata.157553.v1/t7

    Observed ($N_{\text{obs}}$) and expected ($N_{\text{exp}}$) yields after the background-only fit for the flavor-merged inclusive SRs. The third and fourth columns...

  • Expected exclusion limit from Fig. 15

    Data from Fig. 15

    10.17182/hepdata.157553.v1/t8

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Expected $+1\sigma$ exclusion limit from Fig. 15

    Data from Fig. 15

    10.17182/hepdata.157553.v1/t9

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Expected $-1\sigma$ exclusion limit from Fig. 15

    Data from Fig. 15

    10.17182/hepdata.157553.v1/t10

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Observed exclusion limit from Fig. 15

    Data from Fig. 15

    10.17182/hepdata.157553.v1/t11

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Observed $+1\sigma$ exclusion limit from Fig. 15

    Data from Fig. 15

    10.17182/hepdata.157553.v1/t12

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Observed $-1\sigma$ exclusion limit from Fig. 15

    Data from Fig. 15

    10.17182/hepdata.157553.v1/t13

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Expected exclusion limit from Fig. 16a

    Data from Fig. 16a

    10.17182/hepdata.157553.v1/t14

    Observed and expected exclusion limits on the SBH model where only $\tilde{e}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Expected $+1\sigma$ exclusion limit from Fig. 16a

    Data from Fig. 16a

    10.17182/hepdata.157553.v1/t15

    Observed and expected exclusion limits on the SBH model where only $\tilde{e}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Expected $-1\sigma$ exclusion limit from Fig. 16a

    Data from Fig. 16a

    10.17182/hepdata.157553.v1/t16

    Observed and expected exclusion limits on the SBH model where only $\tilde{e}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Observed exclusion limit from Fig. 16a

    Data from Fig. 16a

    10.17182/hepdata.157553.v1/t17

    Observed and expected exclusion limits on the SBH model where only $\tilde{e}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Observed $+1\sigma$ exclusion limit from Fig. 16a

    Data from Fig. 16a

    10.17182/hepdata.157553.v1/t18

    Observed and expected exclusion limits on the SBH model where only $\tilde{e}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Observed $-1\sigma$ exclusion limit from Fig. 16a

    Data from Fig. 16a

    10.17182/hepdata.157553.v1/t19

    Observed and expected exclusion limits on the SBH model where only $\tilde{e}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Expected exclusion limit from Fig. 16b

    Data from Fig. 16b

    10.17182/hepdata.157553.v1/t20

    Observed and expected exclusion limits on the SBH model where only $\tilde{\mu}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Expected $+1\sigma$ exclusion limit from Fig. 16b

    Data from Fig. 16b

    10.17182/hepdata.157553.v1/t21

    Observed and expected exclusion limits on the SBH model where only $\tilde{\mu}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Expected $-1\sigma$ exclusion limit from Fig. 16b

    Data from Fig. 16b

    10.17182/hepdata.157553.v1/t22

    Observed and expected exclusion limits on the SBH model where only $\tilde{\mu}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Observed exclusion limit from Fig. 16b

    Data from Fig. 16b

    10.17182/hepdata.157553.v1/t23

    Observed and expected exclusion limits on the SBH model where only $\tilde{\mu}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Observed $+1\sigma$ exclusion limit from Fig. 16b

    Data from Fig. 16b

    10.17182/hepdata.157553.v1/t24

    Observed and expected exclusion limits on the SBH model where only $\tilde{\mu}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Observed $-1\sigma$ exclusion limit from Fig. 16b

    Data from Fig. 16b

    10.17182/hepdata.157553.v1/t25

    Observed and expected exclusion limits on the SBH model where only $\tilde{\mu}_{\text{L}}$ is considered. The expected 95% CL exclusion limit...

  • Kinematics 1 in SROS-off-b-$e\mu\mu$

    Data from Aux. Fig. 2a

    10.17182/hepdata.157553.v1/t26

    Distribution of $E_{\text{T}}^{\text{miss}}$ in SROS-off-b-$e\mu\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics 2 in SROS-off-b-$e\mu\mu$

    Data from Aux. Fig. 2b

    10.17182/hepdata.157553.v1/t27

    Distribution of $m_{\text{T}}^{\text{min}}$ in SROS-off-b-$e\mu\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics in SRSS-$eee$

    Data from Aux. Fig. 2c

    10.17182/hepdata.157553.v1/t28

    Distribution of $E_{\text{T}}^{\text{miss}}$ in SRSS-$eee$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Kinematics in SRSS-$ee\mu$

    Data from Aux. Fig. 2d

    10.17182/hepdata.157553.v1/t29

    Distribution of $E_{\text{T}}^{\text{miss}}$ in SRSS-$ee\mu$. The SR selections are applied for each distribution, except for the variable shown, for which...

  • Expected exclusion limit from Aux. Fig. 3

    Data from Aux. Fig. 3

    10.17182/hepdata.157553.v1/t30

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ is considered. The expected 95%...

  • Expected $+1\sigma$ exclusion limit from Aux. Fig. 3

    Data from Aux. Fig. 3

    10.17182/hepdata.157553.v1/t31

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ is considered. The expected 95%...

  • Expected $-1\sigma$ exclusion limit from Aux. Fig. 3

    Data from Aux. Fig. 3

    10.17182/hepdata.157553.v1/t32

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ is considered. The expected 95%...

  • Observed exclusion limit from Aux. Fig. 3

    Data from Aux. Fig. 3

    10.17182/hepdata.157553.v1/t33

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ is considered. The expected 95%...

  • Observed $+1\sigma$ exclusion limit from Aux. Fig. 3

    Data from Aux. Fig. 3

    10.17182/hepdata.157553.v1/t34

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ is considered. The expected 95%...

  • Observed $-1\sigma$ exclusion limit from Aux. Fig. 3

    Data from Aux. Fig. 3

    10.17182/hepdata.157553.v1/t35

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ is considered. The expected 95%...

  • Expected exclusion limit from Aux. Fig. 4

    Data from Aux. Fig. 4

    10.17182/hepdata.157553.v1/t36

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Expected $+1\sigma$ exclusion limit from Aux. Fig. 4

    Data from Aux. Fig. 4

    10.17182/hepdata.157553.v1/t37

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Expected $-1\sigma$ exclusion limit from Aux. Fig. 4

    Data from Aux. Fig. 4

    10.17182/hepdata.157553.v1/t38

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Observed exclusion limit from Aux. Fig. 4

    Data from Aux. Fig. 4

    10.17182/hepdata.157553.v1/t39

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Observed $+1\sigma$ exclusion limit from Aux. Fig. 4

    Data from Aux. Fig. 4

    10.17182/hepdata.157553.v1/t40

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Observed $-1\sigma$ exclusion limit from Aux. Fig. 4

    Data from Aux. Fig. 4

    10.17182/hepdata.157553.v1/t41

    Observed and expected exclusion limits on the SBH model where mass-degenerate $\tilde{e}_{\text{L}}$, $\tilde{\mu}_{\text{L}}$ and $\tilde{\nu}$ are considered. The expected 95%...

  • Expected cross-section upper limits from Aux. Fig. 5a

    Data from Aux. Fig. 5a

    10.17182/hepdata.157553.v1/t42

    The expected upper limits on the cross-section for each signal point. The gray numbers represent the values. The expected (dashed)...

  • Observed cross-section upper limits from Aux. Fig. 5a

    Data from Aux. Fig. 5b

    10.17182/hepdata.157553.v1/t43

    The observed upper limits on the cross-section for each signal point. The gray numbers represent the values. The expected (dashed)...

  • Signal acceptances for SROS-on-a

    Data from Aux. Fig. 6a

    10.17182/hepdata.157553.v1/t44

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal acceptances for SROS-on-b

    Data from Aux. Fig. 6b

    10.17182/hepdata.157553.v1/t45

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal acceptances for SROS-on-c

    Data from Aux. Fig. 6c

    10.17182/hepdata.157553.v1/t46

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal acceptances for SROS-off-a

    Data from Aux. Fig. 6d

    10.17182/hepdata.157553.v1/t47

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal acceptances for SROS-off-b

    Data from Aux. Fig. 6e

    10.17182/hepdata.157553.v1/t48

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal acceptances for SROS-off-c

    Data from Aux. Fig. 6f

    10.17182/hepdata.157553.v1/t49

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal acceptances for SRSS

    Data from Aux. Fig. 6g

    10.17182/hepdata.157553.v1/t50

    Acceptance for signals with $m(\tilde{\chi}^0_1)=100$ GeV in flavored-merged SRs. The acceptance is given by the ratio of weighted selected events...

  • Signal efficiencies for SROS-on-$eee$

    Data from Aux. Fig. 7a

    10.17182/hepdata.157553.v1/t51

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-on-$ee\mu$

    Data from Aux. Fig. 7b

    10.17182/hepdata.157553.v1/t52

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-on-$e\mu\mu$

    Data from Aux. Fig. 7c

    10.17182/hepdata.157553.v1/t53

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-on-$\mu\mu\mu$

    Data from Aux. Fig. 7d

    10.17182/hepdata.157553.v1/t54

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-off-$eee$

    Data from Aux. Fig. 7e

    10.17182/hepdata.157553.v1/t55

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-off-$ee\mu$

    Data from Aux. Fig. 7f

    10.17182/hepdata.157553.v1/t56

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-off-$e\mu\mu$

    Data from Aux. Fig. 7g

    10.17182/hepdata.157553.v1/t57

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SROS-off-$\mu\mu\mu$

    Data from Aux. Fig. 7h

    10.17182/hepdata.157553.v1/t58

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SRSS-$eee$

    Data from Aux. Fig. 7i

    10.17182/hepdata.157553.v1/t59

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SRSS-$ee\mu$

    Data from Aux. Fig. 7j

    10.17182/hepdata.157553.v1/t60

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Signal efficiencies for SRSS-$2\mu$

    Data from Aux. Fig. 7k

    10.17182/hepdata.157553.v1/t61

    Efficiencies for signals with $m(\tilde{\chi}^0_1)=100$ GeV in the $m_{3\ell}$ merged SRSFOS and SRSS. The efficiency is defined by the number...

  • Cutflow for SROS-on

    Data from Aux. Table 2

    10.17182/hepdata.157553.v1/t62

    Summary of the number of events passing each selection for the $m(\tilde{\ell}_{\text{L}}^{\pm},\tilde{\chi}^0_3,\tilde{\chi}^0_1)=(300, 200, 100)$, $(550, 300, 100)$, $(450, 180, 100)$...

  • Cutflow for SROS-off

    Data from Aux. Table 2

    10.17182/hepdata.157553.v1/t63

    Summary of the number of events passing each selection for the $m(\tilde{\ell}_{\text{L}}^{\pm},\tilde{\chi}^0_3,\tilde{\chi}^0_1)=(300, 200, 100)$, $(550, 300, 100)$, $(450, 180, 100)$...

  • Cutflow for SRSS

    Data from Aux. Table 2

    10.17182/hepdata.157553.v1/t64

    Summary of the number of events passing each selection for the $m(\tilde{\ell}_{\text{L}}^{\pm},\tilde{\chi}^0_3,\tilde{\chi}^0_1)=(300, 200, 100)$, $(550, 300, 100)$, $(450, 180, 100)$...

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