Enhancement of new physics signal sensitivity with mistagged charm quarks

Abstract

We investigate the potential for enhancing search sensitivity for signals having charm quarks in the final state, using the sizable bottom-mistagging rate for charm quarks at the LHC. Provided that the relevant background processes contain light quarks instead of charm quarks, the application of b-tagging on charm quark-initiated jets enables us to reject more background events than signal ones due to the relatively small mistagging rate for light quarks. The basic idea is tested with two rare top decay processes: i) t -> c h -> c b bbar and ii) t -> b H+ -> b bbar c where h and H+ denote the Standard Model-like higgs boson and a charged higgs boson, respectively. The major background source is a hadronic top quark decay such as t -> b W+ -> b sbar c. We test our method with Monte Carlo simulation at the LHC 14TeV, and find that the signal-over-background ratio can be increased by a factor of O(6-7) with a suitably designed (heavy) flavor tagging algorithm and scheme.

5 pages, 2 figures, Journal-submitted version

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Cited by in corpus (5)

• Rare Top Decays in Minimal and Non-minimal Universal Extra Dimension
• Probing Higgs couplings to light quarks via Higgs pair production
• $t\to cg$ and $t\to cZ$ in Universal Extra Dimensional Models
• Constraints on top quark flavor changing neutral currents using diphoton events at the LHC
• Top Rare Decays t-> cV in the Mirror Twin Higgs Models