Search for production of a Higgs boson and a single top quark in multilepton final states in proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ - INSPIRE

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Search for production of a Higgs boson and a single top quark in multilepton final states in proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

CMS

Collaboration

2017

17 pages

Report number:

CMS-PAS-HIG-17-005

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

A search for the production of a Higgs boson in association with a single top quark is presented, focusing on leptonic signatures provided by the

\mathrm{H}\rightarrow\mathrm{W}\mathrm{W}

,

\mathrm{H}\rightarrow\tau\tau

, and

\mathrm{H}\rightarrow\mathrm{Z}\mathrm{Z}

decay modes. Due to strong interference of the two main leading-order diagrams, the production cross section of this process is highly sensitive to the relative sign of the top-Higgs coupling modifier,

\kappa_{\mathrm{t}}

, and the coupling modifier of vector bosons to the Higgs,

\kappa_{\mathrm{V}}

. The analysis exploits signatures with two same-sign leptons or three leptons in the final state, and uses the 2016 data sample collected with the CMS detector at the LHC at a center of mass energy of

13~\mathrm{TeV}

, which corresponds to an integrated luminosity of

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

. Multivariate techniques are used to discriminate the signal from the dominant backgrounds. The analysis yields a

95\%

confidence level (C.L.) upper limit on the combined

\mathrm{tH}+\mathrm{t\overline{t}H}

production cross section times branching ratio of

0.64\,\mathrm{pb}

, with an expected limit of

0.32\,\mathrm{pb}

, for a scenario with

\kappa_\mathrm{t}=-1.0

and

\kappa_\mathrm{V}=1.0

. Values of

\kappa_\mathrm{t}

outside the range of

-1.25

to

+1.60

are excluded at

95\%

C.L., assuming

\kappa_\mathrm{V}=1.0

.

Note:

Preliminary results

Data
p p: scattering
p p: colliding beams
Higgs particle: hadroproduction
top: single production
Higgs particle: associated production
signature: leptonic
lepton: multiple production
W: pair production
Z0: pair production

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