Abstract (data abstract)

A search for supersymmetry in events with two or three low-momentum leptons and missing transverse momentum is performed. The search uses proton-proton collisions at $\sqrt{s} = 13~\text{TeV}$ collected in the three-year period $2016-2018$ by the CMS experiment at the LHC and corresponding to an integrated luminosity of up to $137~\text{fb}^{-1}$. The data are found to be in agreement with expectations from standard model processes. The results are interpreted in terms of electroweakino and top squark pair production with a small mass difference between the produced supersymmetric particles and the lightest neutralino. For the electroweakino interpretation, two simplified models are used, a wino-bino model and a higgsino model. Exclusion limits at $95\%$ confidence level are set on $\tilde{\chi}^0_2/\tilde{\chi}^\pm_1$ masses up to $275~\text{GeV}$ for a mass difference of $10~\text{GeV}$ in the wino-bino case, and up to $205(150)~\text{GeV}$ for a mass difference of $7.5(3)~\text{GeV}$ in the higgsino case. The results for the higgsino are further interpreted using a phenomenological minimal supersymmetric standard model, excluding the higgsino mass parameter $\mu$ up to $180~\text{GeV}$ with the bino mass parameter $M_1$ at $800~\text{GeV}$. In the top squark interpretation, exclusion limits are set at top squark masses up to $540~\text{GeV}$ for four-body top squark decays and up to $480~\text{GeV}$ for chargino-mediated decays with a mass difference of $30~\text{GeV}$.

Figure 2a

Data from Figure 2 (upper left).

10.17182/hepdata.114415.v1/t1

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the low-MET bin for the DY CR. Uncertainties include both...
Figure 2b

Data from Figure 2 (upper right).

10.17182/hepdata.114415.v1/t2

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the high-MET bin for the DY CR. Uncertainties include both...
Figure 2c

Data from Figure 2 (lower left).

10.17182/hepdata.114415.v1/t3

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the low-MET bin for the $\text{t}\bar{\text{t}}$ CR. Uncertainties include both...
Figure 2d

Data from Figure 2 (lower right).

10.17182/hepdata.114415.v1/t4

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the high-MET bin for the $\text{t}\bar{\text{t}}$ CR. Uncertainties include both...
Figure 3a

Data from Figure 3 (left).

10.17182/hepdata.114415.v1/t5

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the low-MET bin for the WZ-enriched region. Uncertainties include both...
Figure 3b

Data from Figure 3 (right).

10.17182/hepdata.114415.v1/t6

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the high-MET bin for the WZ-enriched region. Uncertainties include both...
Figure 4

Data from Figure 4.

10.17182/hepdata.114415.v1/t7

The post-fit distribution of the $M(\ell\ell)$ variable is shown for the high-MET bin for the SS CR. Uncertainties include both...
Figure 5a

Data from Figure 5 (upper left).

10.17182/hepdata.114415.v1/t8

The 2$\ell$-Ewk SR: the post-fit distribution of the $M(\ell\ell)$ variable is shown for the low-MET bin. Uncertainties include both the...
Figure 5b

Data from Figure 5 (upper right).

10.17182/hepdata.114415.v1/t9

The 2$\ell$-Ewk SR: the post-fit distribution of the $M(\ell\ell)$ variable is shown for the med-MET bin. Uncertainties include both the...
Figure 5c

Data from Figure 5 (lower left).

10.17182/hepdata.114415.v1/t10

The 2$\ell$-Ewk SR: the post-fit distribution of the $M(\ell\ell)$ variable is shown for the high-MET bin. Uncertainties include both the...
Figure 5d

Data from Figure 5 (lower right).

10.17182/hepdata.114415.v1/t11

The 2$\ell$-Ewk SR: the post-fit distribution of the $M(\ell\ell)$ variable is shown for the ultra-MET bin. Uncertainties include both the...
Figure 6a

Data from Figure 6 (left).

10.17182/hepdata.114415.v1/t12

The 3$\ell$-Ewk search regions: the post-fit distribution of the $M^{\text{min}}_{\text{SFOS}}(\ell\ell)$ variable is shown for the low-MET bin. Uncertainties include both...
Figure 6b

Data from Figure 6 (right).

10.17182/hepdata.114415.v1/t13

The 3$\ell$-Ewk search regions: the post-fit distribution of the $M^{\text{min}}_{\text{SFOS}}(\ell\ell)$ variable is shown for the high-MET bin. Uncertainties include both...
Figure 7a

Data from Figure 7 (upper left).

10.17182/hepdata.114415.v1/t14

The 2$\ell$-Stop SR: the post-fit distribution of the leading lepton $p_{T}$ variable is shown for the low-MET bin. Uncertainties include...
Figure 7b

Data from Figure 7 (upper right).

10.17182/hepdata.114415.v1/t15

The 2$\ell$-Stop SR: the post-fit distribution of the leading lepton $p_{T}$ variable is shown for the med-MET bin. Uncertainties include...
Figure 7c

Data from Figure 7 (lower left).

10.17182/hepdata.114415.v1/t16

The 2$\ell$-Stop SR: the post-fit distribution of the leading lepton $p_{T}$ variable is shown for the high-MET bin. Uncertainties include...
Figure 7d

Data from Figure 7 (lower right).

10.17182/hepdata.114415.v1/t17

The 2$\ell$-Stop SR: the post-fit distribution of the leading lepton $p_{T}$ variable is shown for the ultra-MET bin. Uncertainties include...
Figure 8a

Data from Figure 8 (upper).

10.17182/hepdata.114415.v1/t18

The observed 95% CL exclusion contours (black curves) assuming the NLO+NLL cross sections, with the variations (thin lines) corresponding to...
Figure 8b

Data from Figure 8 (lower).

10.17182/hepdata.114415.v1/t19

The observed 95% CL exclusion contours (black curves) assuming the NLO+NLL cross sections, with the variations (thin lines) corresponding to...
Figure 9a

Data from Figure 9 (upper).

10.17182/hepdata.114415.v1/t20

The observed 95% CL exclusion contours (black curves) assuming the NLO+NLL cross sections, with the variations (thin lines) corresponding to...
Figure 9b

Data from Figure 9 (lower).

10.17182/hepdata.114415.v1/t21

The observed 95% CL exclusion contours (black curves) assuming the NLO+NLL cross sections, with the variations (thin lines) corresponding to...
Figure 10a

Data from Figure 10 (upper).

10.17182/hepdata.114415.v1/t22

The observed 95% CL exclusion contours (black curves) assuming the NLO+NLL cross sections, with the variations (thin lines) corresponding to...
Figure 10b

Data from Figure 10 (lower).

10.17182/hepdata.114415.v1/t23

The observed 95% CL exclusion contours (black curves) assuming the NLO+NLL cross sections, with the variations (thin lines) corresponding to...

Figure 2a

Figure 2b

Figure 2c

Figure 2d

Figure 3a

Figure 3b

Figure 4

Figure 5a

Figure 5b

Figure 5c

Figure 5d

Figure 6a

Figure 6b

Figure 7a

Figure 7b

Figure 7c

Figure 7d

Figure 8a

Figure 8b

Figure 9a

Figure 9b

Figure 10a

Figure 10b

JSON

YAML

YODA

YODA1

ROOT

CSV

Visualize

Ask a Question