Searching for t→ch with multileptons

Nathaniel Craig, Jared A. Evans, Richard Gray, Michael Park, Sunil Somalwar, Scott Thomas, Matthew Walker

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The results of a multilepton search conducted by the CMS collaboration with 5fb -1 of data collected from 7 TeV pp collisions are used to place the first bound on the rare flavor-changing decay of the top quark to a Higgs boson and charm quark. Combining results from a number of exclusive three- and four-lepton search channels yields an estimated upper limit of Br(t→ch)<2.7 for a Higgs boson mass of 125 GeV. The sensitivity of future dedicated searches for t→ch could be improved by adding exclusive same sign dilepton channels, as well as by subdividing channels based on b-quark tagging and partial kinematic top quark and Higgs boson tagging. This bound may be interpreted more widely within a range of new physics processes that yield final states with a W-boson in association with a Higgs boson. For such processes with kinematics that are similar to top-anti-top production and decay, the estimated limit on cross section times branching ratio corresponds to roughly σ•Br(pp→WhX)<9pb.

Original languageEnglish (US)
Article number075002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number7
DOIs
StatePublished - Oct 1 2012

Fingerprint

Biomechanical Phenomena
Higgs bosons
quarks
Physics
marking
leptons
kinematics
bosons
decay
physics
collisions
sensitivity
cross sections

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Craig, Nathaniel ; Evans, Jared A. ; Gray, Richard ; Park, Michael ; Somalwar, Sunil ; Thomas, Scott ; Walker, Matthew. / Searching for t→ch with multileptons. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2012 ; Vol. 86, No. 7.
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Searching for t→ch with multileptons. / Craig, Nathaniel; Evans, Jared A.; Gray, Richard; Park, Michael; Somalwar, Sunil; Thomas, Scott; Walker, Matthew.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 86, No. 7, 075002, 01.10.2012.

Research output: Contribution to journalArticle

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