Search for new long-lived particles at s=13 TeV

The CMS Collaboration

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb−1 collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm.

Original languageEnglish
Pages (from-to)432-454
Number of pages23
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume780
DOIs
Publication statusPublished - 2018 May 10

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leptons
decay
confidence
quarks
particle mass
decay rates
center of mass
parity
actuators
luminosity
cross sections
energy

Keywords

  • CMS
  • Long-lived particles
  • Physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Search for new long-lived particles at s=13 TeV. / The CMS Collaboration.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 780, 10.05.2018, p. 432-454.

Research output: Contribution to journalArticle

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abstract = "A search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb−1 collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95{\%} confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95{\%} confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm.",
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