Search for a singly produced vector-like quark B decaying to a b quark and a Higgs boson in a fully hadronic final state using boosted topologies

, with the Higgs boson decaying to a pair of bottom quarks. The decay products of the Higgs boson are highly boosted, hence typically collimated. They are reconstructed as a single, massive jet, with heavy flavour content. The single production of vector-like quarks is characterised by the presence of a light flavour quark emitted in the forward region of the detector. The analysis is performed using a data sample collected in 2016 by the CMS experiment at the LHC in proton-proton collisions at a centre-of-mass energy of

\sqrt{s}=13~\mathrm{TeV}

, corresponding to an integrated luminosity of

35.9~\mathrm{fb}^{-1}

. The observation is consistent with background expectation and upper limits are placed on the production cross section times the branching ratio of a vector-like quark B decaying to a Higgs boson and a bottom quark. Values of cross section times branching ratio above

0.07

--

1.28~\mathrm{pb}

are excluded at

95\%

confidence level for masses of

700

--

1800~\mathrm{GeV}

, assuming a resonance with negligible width with respect to experimental resolution. Similar sensitivity is observed for different assumptions on the intrinsic width of the vector-like quark B.

Note:

Preliminary results

Data
p p: colliding beams
quark: postulated particle
quark: vector particle
quark: flavor
final state: hadronic
p p: scattering
Higgs particle: associated production
Higgs particle: hadronic decay
bottom: multiple production

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