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Search for disappearing tracks in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The collaboration
Phys.Lett.B 806 (2020) 135502, 2020.

Abstract (data abstract)
A search is presented for long-lived charged particles that decay within the volume of the silicon tracker of the CMS experiment. Such particles can produce events with an isolated track that is missing hits in the outermost layers of the silicon tracker, and is also associated with little energy deposited in the calorimeters and no hits in the muon detectors. The search for events with this "disappearing track" signature is performed in a sample of proton-proton collisions recorded by the CMS experiment at the LHC with a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $101\text{fb}^{-1}$ recorded in 2017 and 2018. The observation of $48$ events is consistent with the estimated background of $47.8 \, _{-2.3}^{+2.7} \, (\text{stat}) \pm 8.1 \, (\text{syst})$ events. Upper limits are set on chargino production in the context of an anomaly-mediated supersymmetry breaking model for purely wino and higgsino neutralino scenarios. At $95\%$ confidence level, the first constraint is placed on chargino masses in the higgsino case, excluding below $750$ ($175$) GeV for a lifetime of $3$ ($0.05$) ns. In the wino case, the results of this search are combined with a previous CMS search to produce a result representing the complete LHC data set recorded in 2015-2018, the most stringent constraints to date. At $95\%$ confidence level, chargino masses in the wino case are excluded below $884$ ($474$) GeV for a lifetime of $3$ ($0.2$) ns.

• #### Cross section limits vs. mass (0.3 ns, wino LSP)

Data from Figure 1.

10.17182/hepdata.95354.v1/t1

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (3.3 ns, wino LSP)

Data from Figure 1.

10.17182/hepdata.95354.v1/t2

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (33 ns, wino LSP)

Data from Figure 1.

10.17182/hepdata.95354.v1/t3

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (333 ns, wino LSP)

Data from Figure 1.

10.17182/hepdata.95354.v1/t4

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (0.3 ns, higgsino LSP)

10.17182/hepdata.95354.v1/t5

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (3.3 ns, higgsino LSP)

10.17182/hepdata.95354.v1/t6

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (33 ns, higgsino LSP)

10.17182/hepdata.95354.v1/t7

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cross section limits vs. mass (333 ns, higgsino LSP)

10.17182/hepdata.95354.v1/t8

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Mass limits vs. lifetime, wino LSP

Data from Figure 2.

10.17182/hepdata.95354.v1/t9

The expected and observed constraints on chargino lifetime and mass for a purely wino LSP in the context of AMSB,...

• #### Cross section limits vs. lifetime and mass, wino LSP

10.17182/hepdata.95354.v1/t10

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Mass limits vs. lifetime, higgsino LSP

Data from Figure 3.

10.17182/hepdata.95354.v1/t11

The expected and observed constraints on chargino lifetime and mass for a purely higgsino LSP in the context of AMSB,...

• #### Cross section limits vs. lifetime and mass, higgsino LSP

10.17182/hepdata.95354.v1/t12

The expected and observed 95% CL upper limits on the product of cross section and branching fraction for direct production...

• #### Cut-flow table for 700 GeV (wino LSP) 2017

10.17182/hepdata.95354.v1/t13

Predicted signal yields for the 2017 data-taking period, corresponding to $41.5\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 700 GeV (higgsino LSP) 2017

10.17182/hepdata.95354.v1/t14

Predicted signal yields for the 2017 data-taking period, corresponding to $41.5\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 300 GeV (wino LSP) 2017

10.17182/hepdata.95354.v1/t15

Predicted signal yields for the 2017 data-taking period, corresponding to $41.5\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 300 GeV (higgsino LSP) 2017

10.17182/hepdata.95354.v1/t16

Predicted signal yields for the 2017 data-taking period, corresponding to $41.5\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 700 GeV (wino LSP) 2018A

10.17182/hepdata.95354.v1/t17

Predicted signal yields for the 2018A data-taking period, corresponding to $21.1\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 700 GeV (higgsino LSP) 2018A

10.17182/hepdata.95354.v1/t18

Predicted signal yields for the 2018A data-taking period, corresponding to $21.1\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 300 GeV (wino LSP) 2018A

10.17182/hepdata.95354.v1/t19

Predicted signal yields for the 2018A data-taking period, corresponding to $21.1\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 300 GeV (higgsino LSP) 2018A

10.17182/hepdata.95354.v1/t20

Predicted signal yields for the 2018A data-taking period, corresponding to $21.1\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 700 GeV (wino LSP) 2018B

10.17182/hepdata.95354.v1/t21

Predicted signal yields for the 2018B data-taking period, corresponding to $38.6\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 700 GeV (higgsino LSP) 2018B

10.17182/hepdata.95354.v1/t22

Predicted signal yields for the 2018B data-taking period, corresponding to $38.6\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 300 GeV (wino LSP) 2018B

10.17182/hepdata.95354.v1/t23

Predicted signal yields for the 2018B data-taking period, corresponding to $38.6\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### Cut-flow table for 300 GeV (higgsino LSP) 2018B

10.17182/hepdata.95354.v1/t24

Predicted signal yields for the 2018B data-taking period, corresponding to $38.6\,\text{fb}^{-1}$, after the application of each search requirement for three...

• #### chargino+chargino acceptances (wino LSP, 2017)

10.17182/hepdata.95354.v1/t25

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events,...

• #### chargino+neutralino acceptances (wino LSP, 2017)

10.17182/hepdata.95354.v1/t26

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1}$ events,...

• #### chargino+chargino acceptances (higgsino LSP, 2017)

10.17182/hepdata.95354.v1/t27

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events,...

• #### chargino+neutralino acceptances (higgsino LSP, 2017)

10.17182/hepdata.95354.v1/t28

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1,2}$ events,...

• #### chargino+chargino acceptances (wino LSP, 2018A)

10.17182/hepdata.95354.v1/t29

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events,...

• #### chargino+neutralino acceptances (wino LSP, 2018A)

10.17182/hepdata.95354.v1/t30

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1}$ events,...

• #### chargino+chargino acceptances (higgsino LSP, 2018A)

10.17182/hepdata.95354.v1/t31

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events,...

• #### chargino+neutralino acceptances (higgsino LSP, 2018A)

10.17182/hepdata.95354.v1/t32

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1,2}$ events,...

• #### chargino+chargino acceptances (wino LSP, 2018B)

10.17182/hepdata.95354.v1/t33

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events,...

• #### chargino+neutralino acceptances (wino LSP, 2018B)

10.17182/hepdata.95354.v1/t34

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1}$ events,...

• #### chargino+chargino acceptances (higgsino LSP, 2018B)

10.17182/hepdata.95354.v1/t35

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events,...

• #### chargino+neutralino acceptances (higgsino LSP, 2018B)

10.17182/hepdata.95354.v1/t36

Signal acceptance times efficiency ($A\times\epsilon$) for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1,2}$ events,...

• #### Estimated backgrounds and observation

10.17182/hepdata.95354.v1/t37

Summary of the estimated backgrounds and the observation. The first and second uncertainties shown are the statistical and systematic contributions,...