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

The collaboration
Eur.Phys.J.C 82 (2022) 153, 2022.

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

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

Supplemental material

10.17182/hepdata.113658.v1/t22

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

Supplemental material

10.17182/hepdata.113658.v1/t24