Search for disappearing tracks as a signature of new long-lived particles in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
JHEP 1808 (2018) 016, 2018

Abstract (data abstract)
A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. A disappearing track is an isolated track with missing hits in the outer layers of the silicon tracker, little or no energy in associated calorimeter deposits, and no associated hits in the muon detectors. This search uses data collected with the CMS detector in 2015 and 2016 from proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, corresponding to an integrated luminosity of 38.4 $\mathrm{fb}^{-1}$. The results of the search are interpreted in the context of the anomaly-mediated supersymmetry breaking model. The data are consistent with the background-only hypothesis. Limits are set on the product of the cross section for direct production of charginos and their branching fraction to a neutralino and a pion, as a function of the chargino mass and lifetime. At 95% confidence level, charginos with masses below 715 (695) GeV are excluded for a lifetime of 3 (7) ns, as are charginos with lifetimes from 0.5 to 60 ns for a mass of 505 GeV. These are the most stringent limits using a disappearing track signature on this signal model for chargino lifetimes above $\approx$0.7 ns.

  • Cross section limits vs. mass (0.3 ns)

    Data from Figure 3.

    10.17182/hepdata.84707.v1/t1

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

  • Cross section limits vs. mass (3.3 ns)

    Data from Figure 3.

    10.17182/hepdata.84707.v1/t2

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

  • Cross section limits vs. mass (33 ns)

    Data from Figure 3.

    10.17182/hepdata.84707.v1/t3

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

  • Mass limits vs. lifetime

    Data from Figure 4.

    10.17182/hepdata.84707.v1/t4

    The expected and observed constraints on chargino lifetime and mass. The ratio of the vacuum expectation values of the two...

  • Cross section limits vs. lifetime and mass

    Data from Figure 5.

    10.17182/hepdata.84707.v1/t5

    The observed 95% CL upper limits on the product of the cross section for direct production of charginos and their...

  • Chargino+chargino acceptance vs. lifetime and mass (2015)

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t6

    Signal acceptance for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events. The denominator for...

  • Chargino+chargino acceptance vs. lifetime and mass (2016A)

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t7

    Signal acceptance for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events. The denominator for...

  • Chargino+chargino acceptance vs. lifetime and mass (2016B)

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t8

    Signal acceptance for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^\mp_{1}$ events. The denominator for...

  • Chargino+neutralino acceptance vs. lifetime and mass (2015)

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t9

    Signal acceptance for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1}$ events. The denominator for...

  • Chargino+neutralino acceptance vs. lifetime and mass (2016A)

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t10

    Signal acceptance for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1}$ events. The denominator for...

  • Chargino+neutralino acceptance vs. lifetime and mass (2016B)

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t11

    Signal acceptance for each of the generated chargino masses and lifetimes for $\mathrm{p}\mathrm{p} \rightarrow \widetilde{\chi}^\pm_{1} \widetilde{\chi}^0_{1}$ events. The denominator for...

  • Cut-flow table for signal, 2015

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t12

    Predicted signal yields for the 2015 data-taking period, corresponding to $2.7\,\text{fb}^{-1}$, after the application of each of the disappearing track...

  • Cut-flow table for signal, 2016A

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t13

    Predicted signal yields for the 2016A data-taking period, corresponding to $8.3\,\text{fb}^{-1}$, after the application of each of the disappearing track...

  • Cut-flow table for signal, 2016B

    Additional material for EXO-16-044.

    10.17182/hepdata.84707.v1/t14

    Predicted signal yields for the 2016B data-taking period, corresponding to $27.4\,\text{fb}^{-1}$, after the application of each of the disappearing track...

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