Search for Charged Higgs boson to ${\rm c\bar{b}}$ in lepton+jets channel using top quark pair events

in top quark pair events using the CMS detector at the LHC are presented. %It is the first search for a charged Higgs boson in this decay mode. The total dataset corresponds to 19.7

{\rm fb^{-1}}

of proton-proton collisions at

\sqrt{s}

= 8 TeV. In

{\rm t\bar{t}}

decays, if one top quark decays to

{\rm H^{+} b}

, instead of

{\rm W b}

, and the

{\rm H^{+}}

subsequently decays to

{\rm c \bar{b}}

, while other top quark decays leptonically (

{\rm \bar{t} \rightarrow W^{-}\bar{b}} \rightarrow l \bar{\nu} {\rm \bar{b}})

), the final state then consists of four jets (three

{\rm b}

quark jets), one lepton (electron or muon), and missing energy:

{\rm t\bar{t} \rightarrow (H^{+}b)(W^{-}\bar{b})}

\rightarrow {\rm (c\bar{b} b)} (l \bar{\nu} {\rm \bar{b}})

. The main observable used in the analysis is an invariant mass of two jets, one of which is identified as a b quark jet. The dijet pair is selected from at least four jets in an event by a dedicated kinematic fitter. No signal for the presence of a charged Higgs boson is observed and upper limits are set at 95\% confidence level on the branching ratio for

{\rm t \rightarrow H^{+} b}

from 1.1--0.4\% for the charged Higgs boson mass in the range 90--150~GeV in the assumption of branching ratio of

{\rm B(H^{+} \rightarrow c\bar{b})=100\%}

for the first time.

Note:

Preliminary results

Data
p p: colliding beams
Higgs particle: charged particle
Higgs particle: hadronic decay
top: decay
top: pair production
jet: mass
Higgs particle: mass
jet: bottom
bottom: particle identification

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Figures(42)

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