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Search for Displaced Leptons in $\sqrt{s} = 13$ TeV $pp$ Collisions with the ATLAS Detector

The ATLAS collaboration
Phys.Rev.Lett. 127 (2021) 051802, 2021.

Abstract
A search for charged leptons with large impact parameters using 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV $pp$ collision data from the ATLAS detector at the LHC is presented, addressing a long-standing gap in coverage of possible new physics signatures. Results are consistent with the background prediction. This search provides unique sensitivity to long-lived scalar supersymmetric lepton-partners (sleptons). For lifetimes of 0.1 ns, selectron, smuon and stau masses up to 720 GeV, 680 GeV, and 340 GeV are respectively excluded at 95% confidence level, drastically improving on the previous best limits from LEP.

  • Cutflow SR-ee

    Table aux12

    10.17182/hepdata.98796.v1/t1

    Cutflow for SR-$ee$ for 5 representative signal points. For the following $\tilde{e}$ mass and lifetime points, the number of Monte...

  • Cutflow SR-em

    Table aux14

    10.17182/hepdata.98796.v1/t2

    Cutflow for SR-$e\mu$ for 2 representative signal points. For the $\tilde{\tau}$ mass and lifetime points, the number of Monte Carlo...

  • Cutflow SR-mm

    Table aux13

    10.17182/hepdata.98796.v1/t3

    Cutflow for SR-$\mu\mu$ for 5 representative signal points. For the following $\tilde{\mu}$ mass and lifetime points, the number of Monte...

  • co-NLSP upper limit on cross section

    Figure aux10a

    10.17182/hepdata.98796.v1/t4

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, where all slepton flavors are mass degenerate (co-NLSP).

  • selectron upper limit on cross section

    Figure aux10c

    10.17182/hepdata.98796.v1/t5

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the selectron signal model. Selectron ($\tilde{e}_{L, R}$) refers to the scalar...

  • LH selectron upper limit on cross section

    Figure aux11a

    10.17182/hepdata.98796.v1/t6

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the superpartners of the left-handed electrons, $\tilde{e}_L$.

  • RH selectron upper limit on cross section

    Figure aux11c

    10.17182/hepdata.98796.v1/t7

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the superpartners of the right-handed electrons, $\tilde{e}_R$.

  • smuon upper limit on cross section

    Figure aux10d

    10.17182/hepdata.98796.v1/t8

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the smuon signal model. Smuon ($\tilde{\mu}_{L, R}$) refers to the scalar...

  • LH smuon upper limit on cross section

    Figure aux11b

    10.17182/hepdata.98796.v1/t9

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the superpartners of the left-handed muons, $\tilde{\mu}_L$.

  • RH smuon upper limit on cross section

    Figure aux11d

    10.17182/hepdata.98796.v1/t10

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the superpartners of the right-handed muons, $\tilde{\mu}_R$.

  • stau upper limit on cross section

    Figure aux10b

    10.17182/hepdata.98796.v1/t11

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for the stau signal model. Staus, $\tilde{\tau}_{1,2}$ are the mixed states of...

  • LH stau upper limit on cross section

    Figure aux12

    10.17182/hepdata.98796.v1/t12

    Upper limits on observed signal cross section, $\sigma_\text{obs}^\text{95}$, for $\tilde{\tau}_L$ production, where $\tilde{\tau}_L$ is pure-state superpartner of the left-handed $\tau$.

  • yields

    Table 1

    10.17182/hepdata.98796.v1/t13

    The expected and observed yields in the signal regions. Combined statistical and systematic uncertainties are presented. Estimates are truncated at...

  • pt-d0 electron efficiency

    Figure aux19a

    10.17182/hepdata.98796.v1/t14

    Reconstruction efficiency as a function of $|d_{0}|$ and $p_\text{T}$ for signal electrons. Monte Carlo samples with $\tilde{e}$ or $\tilde{\mu}$ with...

  • pt-d0 muon efficiency

    Figure aux19a

    10.17182/hepdata.98796.v1/t15

    Reconstruction efficiency as a function of $|d_{0}|$ and $p_\text{T}$ for signal muons. Monte Carlo samples with $\tilde{e}$ or $\tilde{\mu}$ with...

  • Selectron acceptance

    Figure aux13a

    10.17182/hepdata.98796.v1/t16

    Acceptance for $\tilde{e}$ of various masses and lifetimes in SR-$ee$. Acceptance is defined as the number of accepted events at...

  • Smuon acceptance

    Figure aux14a

    10.17182/hepdata.98796.v1/t17

    Acceptance for $\tilde{\mu}$ of various masses and lifetimes in SR-$\mu\mu$. Acceptance is defined as the number of accepted events at...

  • Selectron efficiency

    Figure aux13b

    10.17182/hepdata.98796.v1/t18

    Efficiency for $\tilde{e}$ of various masses and lifetimes in SR-$ee$. Efficiency is defined as the number of selected reconstruced events...

  • Smuon efficiency

    Figure aux14b

    10.17182/hepdata.98796.v1/t19

    Efficiency for $\tilde{\mu}$ of various masses and lifetimes in SR-$\mu\mu$. Efficiency is defined as the number of selected reconstruced events...

  • pt-pt selectron acceptance

    Figure aux18a

    10.17182/hepdata.98796.v1/t20

    Acceptance as a function of the generator-level $p_\text{T}$ of the leading and subleading lepton in SR-$ee$ from $\tilde{e}$ decays. The...

  • pt-pt smuon acceptance

    Figure aux18b

    10.17182/hepdata.98796.v1/t21

    Acceptance as a function of the generator-level $p_\text{T}$ of the leading and subleading lepton in SR-$\mu\mu$ from $\tilde{\mu}$ decays. The...

  • Stau SRee acceptance

    Figure aux16a

    10.17182/hepdata.98796.v1/t22

    Acceptance for $\tilde{\tau}$ of various masses and lifetimes in SR-$ee$. Acceptance is defined as the number of accepted events at...

  • Stau SRem acceptance

    Figure aux17a

    10.17182/hepdata.98796.v1/t23

    Acceptance for $\tilde{\tau}$ of various masses and lifetimes in SR-$e\mu$. Acceptance is defined as the number of accepted events at...

  • Stau SRmm acceptance

    Figure aux15a

    10.17182/hepdata.98796.v1/t24

    Acceptance for $\tilde{\tau}$ of various masses and lifetimes in SR-$\mu\mu$. Acceptance is defined as the number of accepted events at...

  • Stau SRee efficiency

    Figure aux16b

    10.17182/hepdata.98796.v1/t25

    Efficiency for $\tilde{\tau}$ of various masses and lifetimes in SR-$ee$. Efficiency is defined as the number of selected reconstruced events...

  • Stau SRem efficiency

    Figure aux17b

    10.17182/hepdata.98796.v1/t26

    Efficiency for $\tilde{\tau}$ of various masses and lifetimes in SR-$e\mu$. Efficiency is defined as the number of selected reconstruced events...

  • Stau SRmm efficiency

    Figure aux15b

    10.17182/hepdata.98796.v1/t27

    Efficiency for $\tilde{\tau}$ of various masses and lifetimes in SR-$\mu\mu$. Efficiency is defined as the number of selected reconstruced events...

  • pt-pt stau acceptance

    Figure aux18c

    10.17182/hepdata.98796.v1/t28

    Acceptance as a function of the generator-level $p_\text{T}$ of the leading and subleading lepton in SR-$e\mu$ from $\tilde{\tau}$ decays. The...

  • Observed co-NSLP limits

    Figure aux6

    10.17182/hepdata.98796.v1/t29

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane where all slepton flavors and...

  • Expected co-NSLP limits

    Figure aux6

    10.17182/hepdata.98796.v1/t30

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane where all slepton flavors and...

  • Observed selectron limits

    Figure aux4a

    10.17182/hepdata.98796.v1/t31

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$ee$ targeting selectron production....

  • Expected selectron limits

    Figure aux4a

    10.17182/hepdata.98796.v1/t32

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$ee$ targeting selectron production....

  • Observed LH selectron limits

    Figure aux8a

    10.17182/hepdata.98796.v1/t33

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$ee$ targeting selectron production....

  • Expected LH selectron limits

    Figure aux8a

    10.17182/hepdata.98796.v1/t34

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$ee$ targeting selectron production....

  • Observed RH selectron limits

    Figure aux7a

    10.17182/hepdata.98796.v1/t35

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$ee$ targeting selectron production....

  • Expected RH selectron limits

    Figure aux7a

    10.17182/hepdata.98796.v1/t36

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$ee$ targeting selectron production....

  • Observed smuon limits

    Figure aux4b

    10.17182/hepdata.98796.v1/t37

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$\mu\mu$ targeting smuon production....

  • Expected smuon limits

    Figure aux4b

    10.17182/hepdata.98796.v1/t38

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$\mu\mu$ targeting smuon production....

  • Observed LH smuon limits

    Figure aux8b

    10.17182/hepdata.98796.v1/t39

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$\mu\mu$ targeting smuon production....

  • Expected LH smuon limits

    Figure aux8b

    10.17182/hepdata.98796.v1/t40

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$\mu\mu$ targeting smuon production....

  • Observed RH smuon limits

    Figure aux7b

    10.17182/hepdata.98796.v1/t41

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$\mu\mu$ targeting smuon production....

  • Expected RH smuon limits

    Figure aux7b

    10.17182/hepdata.98796.v1/t42

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\ell})$ plane in SR-$\mu\mu$ targeting smuon production....

  • Observed stau limits

    Figure aux5

    10.17182/hepdata.98796.v1/t43

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\tau})$ plane. Staus, $\tilde{\tau}_{1,2}$ are the mixed...

  • Expected stau limits

    Figure aux5

    10.17182/hepdata.98796.v1/t44

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\tau})$ plane. Staus, $\tilde{\tau}_{1,2}$ are the mixed...

  • Observed LH stau limits

    Figure aux9

    10.17182/hepdata.98796.v1/t45

    Observed 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\tau}_L)$ plane, where $\tilde{\tau}_L$ is the pure-state...

  • Expected LH stau limits

    Figure aux9

    10.17182/hepdata.98796.v1/t46

    Expected 95% CL exclusion sensitivity. The limit is displayed in the lifetime vs. $m(\tilde{\tau}_L)$ plane, where $\tilde{\tau}_L$ is the pure-state...

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