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Search for long-lived particles decaying to leptons with large impact parameter in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-EXO-18-003, 2021.

Abstract (data abstract)
A search for new long-lived particles (LLPs) decaying to leptons using proton-proton collisions produced by the CERN LHC at $\sqrt{s}=13$ TeV is presented. Events are selected with two leptons (an electron [e] and a muon [$\mu$], two electrons, or two muons) that both have transverse impact parameter values between 0.01 cm and 10 cm. Data used for the analysis were collected with the CMS detector in 2016, 2017, and 2018, and correspond to an integrated luminosity of 118 (113) $\text{fb}^{-1}$ in the ee channel (e$\mu$ and $\mu\mu$ channels). The search is designed to be sensitive to a wide range of models with displaced e$\mu$, ee, and $\mu\mu$ final states. The results constrain several well-motivated models involving new LLPs that decay to displaced leptons. For some areas of the available phase space, these are the most stringent constraints to date.

  • Electron $|d_0|$

    Supplemental material

    10.17182/hepdata.113658.v1/t1

    The distribution of electron $|d_0|$ for the events in data and signal that pass the e$\mu$ preselection. In all of...

  • Muon $|d_0|$

    Supplemental material

    10.17182/hepdata.113658.v1/t2

    The distribution of muon $|d_0|$ for the events in data and signal that pass the e$\mu$ preselection. In all of...

  • Leading muon $|d_0|$ vs leading electron $|d_0|$, bkg simulation

    Data from Figure 2

    10.17182/hepdata.113658.v1/t3

    Two-dimensional distribution of $|d_{0}^{a}|$ vs $|d_{0}^{b}|$, for simulated background events passing the e$\mu$ preselection with 2018 conditions. In each $|d_{0}^{a}|$-$|d_{0}^{b}|$...

  • Leading muon $|d_{0}|$ vs leading electron $|d_{0}|$

    Supplemental material

    10.17182/hepdata.113658.v1/t4

    Two-dimensional distributions of the leading electron vs the leading muon $|d_{0}|$, for the events that pass the e$\mu$ preselection. Data...

  • Subleading electron $|d_0|$ vs leading electron $|d_0|$

    Supplemental material

    10.17182/hepdata.113658.v1/t5

    Two-dimensional distributions of the leading vs the subleading electron $|d_0|$, for the events that pass the ee preselection. Data events...

  • Subleading muon $|d_{0}|$ vs leading muon $|d_{0}|$

    Supplemental material

    10.17182/hepdata.113658.v1/t6

    Two-dimensional distributions of the leading vs the subleading muon $|d_{0}|$, for the events that pass the $\mu\mu$ preselection. Data events...

  • SR yields

    Data from Figure 3

    10.17182/hepdata.113658.v1/t7

    The number of observed and estimated background events in each channel and SR, with a representative signal overlaid. For each...

  • SR yields, 2016

    Supplemental material

    10.17182/hepdata.113658.v1/t8

    The number of observed and estimated background events in each channel and SR in 2016, with a representative signal overlaid....

  • SR yields, 2017-2018

    Supplemental material

    10.17182/hepdata.113658.v1/t9

    The number of observed and estimated background events in each channel and SR in 2017 and 2018, with a representative...

  • $\tilde{t} \to b\ell$ cross section limits

    Data from Figure 4 left

    10.17182/hepdata.113658.v1/t10

    The observed 95% CL upper limits on the long-lived top squark production cross section, in the $c\tau_0$ -- mass plane,...

  • $\tilde{t} \to d\ell$ cross section limits

    Data from Figure 4 right

    10.17182/hepdata.113658.v1/t11

    The observed 95% CL upper limits on the long-lived top squark production cross section, in the $c\tau_0$ -- mass plane,...

  • $\tilde{t} \to b\ell$ mass limits vs $c\tau_0$

    Data from Figure 4 left

    10.17182/hepdata.113658.v1/t12

    The observed 95% CL upper limits on the long-lived top squark production cross section, in the $c\tau_0$ -- mass plane,...

  • $\tilde{t} \to d\ell$ mass limits vs $c\tau_0$

    Data from Figure 4 right

    10.17182/hepdata.113658.v1/t13

    The observed 95% CL upper limits on the long-lived top squark production cross section, in the $c\tau_0$ -- mass plane,...

  • $\tilde{t} \to b\ell$ mass limits vs $c\tau_0$ for each channel

    Supplemental material

    10.17182/hepdata.113658.v1/t14

    The 95% CL upper limits on the long-lived top squark proper decay length ($c\tau_0$) as a function of its mass,...

  • $\tilde{t} \to d\ell$ mass limits vs $c\tau_0$ for each channel

    Supplemental material

    10.17182/hepdata.113658.v1/t15

    The 95% CL upper limits on the long-lived top squark proper decay length ($c\tau_0$) as a function of its mass,...

  • $\tilde{\ell} \to \ell\tilde{G}$ mass limits vs $c\tau_0$

    Data from Figure 5

    10.17182/hepdata.113658.v1/t16

    The 95% CL constraints on the long-lived slepton $c\tau_{0}$ and mass. The $\tilde{\tau}$ and co-NLSP limits are shown for the...

  • $\tilde{\ell} \to \ell\tilde{G}$ co-NLSP cross section limits

    Supplemental material

    10.17182/hepdata.113658.v1/t17

    The observed 95% CL upper limits on the long-lived slepton production cross section, in the $c\tau_0$ -- mass plane. The...

  • $\tilde{\ell}\to\ell\tilde{G}$ co-NLSP mass limits vs $c\tau_0$

    Supplemental material

    10.17182/hepdata.113658.v1/t18

    The observed 95% CL upper limits on the long-lived slepton production cross section, in the $c\tau_0$ -- mass plane. The...

  • H(125) $\to$ SS, S $\to \ell^{+}\ell^{-}$, bf limits

    Data from Figure 6

    10.17182/hepdata.113658.v1/t19

    The 95% CL upper limits on the $\mathrm{H} \to \mathrm{S}\mathrm{S}, \mathrm{S} \to \ell^{+}\ell^{-}$ branching fraction as a function of $c\tau_0$,...

  • H(300) $\to$ SS, S $\to\ell^{+}\ell^{-}, \sigma\times$ bf limits

    Supplemental material

    10.17182/hepdata.113658.v1/t20

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S}, \mathrm{S} \to...

  • H(400) $\to$ SS, S $\to\ell^{+}\ell^{-}, \sigma\times$ bf limits

    Supplemental material

    10.17182/hepdata.113658.v1/t21

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S}, \mathrm{S} \to...

  • H(600) $\to$ SS, S $\to\ell^{+}\ell^{-}, \sigma\times$ bf limits

    Supplemental material

    10.17182/hepdata.113658.v1/t22

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S}, \mathrm{S} \to...

  • H(800) $\to$ SS, S $\to\ell^{+}\ell^{-}, \sigma\times$ bf limits

    Supplemental material

    10.17182/hepdata.113658.v1/t23

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S}, \mathrm{S} \to...

  • H(1000) $\to$ SS, S$\to\ell^{+}\ell^{-}, \sigma\times$ bf limits

    Supplemental material

    10.17182/hepdata.113658.v1/t24

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S}, \mathrm{S} \to...

  • H(125) $\to 4\ell$, bf limits, ee channel

    Supplemental material

    10.17182/hepdata.113658.v1/t25

    The 95% CL upper limits on the $\mathrm{H} \to \mathrm{S}\mathrm{S} \to 4\ell$ branching fraction as a function of $c\tau_0$, for...

  • H(600) $\to 4\ell, \sigma\times$ bf limits, ee channel

    Supplemental material

    10.17182/hepdata.113658.v1/t26

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S} \to 4\ell$...

  • H(1000) $\to 4\ell, \sigma\times$ bf limits, ee channel

    Supplemental material

    10.17182/hepdata.113658.v1/t27

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S} \to 4\ell$...

  • H(125) $\to 4\ell$, bf limits, $\mu\mu$ channel

    Supplemental material

    10.17182/hepdata.113658.v1/t28

    The 95% CL upper limits on the $\mathrm{H} \to \mathrm{S}\mathrm{S} \to 4\ell$ branching fraction as a function of $c\tau_0$, for...

  • H(600) $\to 4\ell, \sigma\times$ bf limits, $\mu\mu$ channel

    Supplemental material

    10.17182/hepdata.113658.v1/t29

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S} \to 4\ell$...

  • H(1000) $\to 4\ell, \sigma\times$ bf limits, $\mu\mu$ channel

    Supplemental material

    10.17182/hepdata.113658.v1/t30

    The 95% CL upper limits on the product of the cross section and branching fraction $\mathrm{H} \to \mathrm{S}\mathrm{S} \to 4\ell$...

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