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Searching for $t \to c h$ with Multi-Leptons · Around

2012

Searching for $t \to c h$ with Multi-Leptons

Craig, Nathaniel, Evans, Jared A., Gray, Richard et al.

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The results of a multi-lepton search conducted by the CMS collaboration with 5 fb$^{-1}$ 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 ${\rm Br}(t \to ch) < 2.7%$ for a Higgs boson mass of 125 GeV.
The sensitivity of future dedicated searches for $t \to c h$ could be improved by adding exclusive same sign di-lepton channels, as well as by sub-dividing 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.

Built on

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K. T. Matchev and S. D. Thomas, “Higgs and Z Z boson signatures of supersymmetry,” Phys. Rev. D 62
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P. Meade, M. Reece, “BRIDGE: Branching ratio inquiry / decay generated events,” [hep-ph/0703031]
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R. C. Gray, C. Kilic, M. Park, S. Somalwar and S. Thomas, “Backgrounds To Higgs Boson Searches from W γ ∗ → ℓ ν ℓ ( ℓ ) W\gamma^{*}\to\ell\nu\ell(\ell) Asymmetric Internal Conversion,” arXiv:1110.1368 [hep-ph]
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Then

S. Moch and P. Uwer, “Heavy-quark pair production at two loops in QCD,” Nucl. Phys. Proc. Suppl. 183
Original
2008
Later among the works it cites.
S. Chatrchyan et al
Original
2011
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LHC Higgs Cross Section Working Group, S. Dittmaier, C. Mariotti, G. Passarino, and R. Tanaka (Eds.), Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables
Original
2011
Later among the works it cites.
E. Contreras-Campana, N. Craig, R. Gray, C. Kilic, M. Park, S. Somalwar and S. Thomas, “Multi-Lepton Signals of the Higgs Boson,” JHEP 1204
Original
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