Search for disappearing tracks as a signature of new long-lived particles in proton-proton collisions at √s=13 TeV
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 deposi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer Verlag
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70349/ http://irep.iium.edu.my/70349/ http://irep.iium.edu.my/70349/ http://irep.iium.edu.my/70349/1/70349_Search%20for%20disappearing%20tracks%20as%20a%20signature_article.pdf http://irep.iium.edu.my/70349/2/70349_Search%20for%20disappearing%20tracks%20as%20a%20signature_scopus.pdf |
| Summary: | 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 protonproton collisions at a center-of-mass energy of 13 TeV at the LHC, corresponding to an
integrated luminosity of 38.4 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 ≈0.7 ns. |
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