Measurement of $\mathrm{t\overline{t}H}$ production in the $\mathrm{H\rightarrow b\overline{b}}$ decay channel in $41.5\,\mathrm{fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=13\,\mathrm{TeV}$ - INSPIRE

DataBETA

Measurement of $\mathrm{t\overline{t}H}$ production in the $\mathrm{H\rightarrow b\overline{b}}$ decay channel in $41.5\,\mathrm{fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=13\,\mathrm{TeV}$

CMS

Collaboration

2019

28 pages

Report number:

CMS-PAS-HIG-18-030

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

reference search47 citations

Citations per year

Abstract:

A measurement of the associated production of a standard model Higgs boson with a top quark-antiquark pair (

\mathrm{t\overline{t}H}

) in proton-proton collisions at

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

is presented. The result is based on data recorded with the CMS detector at the CERN LHC in 2017 and corresponds to an integrated luminosity of

41.5\,\mathrm{fb}^{-1}

. Candidate

\mathrm{t\overline{t}H}

events are selected based on the number of leptons in the event, targeting all

\mathrm{t\overline{t}}

decay channels, and are categorised according to the number of jets. Multivariate analysis techniques are employed to further categorise the events and eventually discriminate between signal and background. A combined fit of multivariate discriminant distributions in all categories results in a best fit value of the

\mathrm{t\overline{t}H}

signal strength relative to the standard model cross section,

\mu = \sigma/\sigma_{\mathrm{SM}}

, of

\hat{\mu} = 1.49\,{}^{+0.21}_{-0.20}\mathrm{(stat)}\,{}^{+0.39}_{-0.35}\mathrm{(syst)}

, corresponding to an observed (expected) significance of 3.7 (2.6) standard deviations. Combined with previous results obtained with

36.9\,\mathrm{fb}^{-1}

of data recorded in 2016, a best-fit value of

\hat{\mu} = 1.15\,{}^{+0.15}_{-0.15}\mathrm{(stat)}\,{}^{+0.28}_{-0.25}\mathrm{(syst)}

is found, corresponding to an observed (expected) significance of 3.9 (3.5) standard deviations above the background-only hypothesis.

Note:

Preliminary results

Monte-Carlo
p p: scattering
top: pair production
Higgs particle: associated production
Higgs particle: hadronic decay
bottom: pair production
bottom: particle identification
CERN LHC Coll
numerical calculations: Monte Carlo
background

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