Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at [Formula presented] TeV

CMS Collaboration

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

A search for pair production of third-generation scalar leptoquarks and supersymmetric top quark partners, top squarks, in final states involving tau leptons and bottom quarks is presented. The search uses events from a data sample of proton–proton collisions corresponding to an integrated luminosity of 19.7 fb−1, collected with the CMS detector at the LHC with s=8 TeV. The number of observed events is found to be in agreement with the expected standard model background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition, this mass limit applies directly to top squarks decaying via an R-parity violating coupling λ333 . The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling λ3jk . Each top squark decays to a tau lepton, a bottom quark, and two light quarks. Top squarks in this model with masses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date, and this is the first search for top squarks decaying via λ3jk .

Original languageEnglish
Pages (from-to)229-249
Number of pages21
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume739
DOIs
StatePublished - Dec 12 2014

Keywords

  • CMS
  • Leptoquark
  • Physics
  • Top squark

Fingerprint Dive into the research topics of 'Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at [Formula presented] TeV'. Together they form a unique fingerprint.

  • Cite this