Analysis of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

Analysis of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

CMS

Collaboration

2020

34 pages

Report number:

CMS-PAS-HIG-20-006

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

pdf

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Abstract:

The first measurement of the CP structure of the Yukawa coupling between the Higgs boson and

\tau

leptons is presented. The measurement is based on data collected in proton-proton collisions at

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

by the CMS experiment at the CERN LHC in 2016, 2017 and 2018, corresponding to an integrated luminosity of

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

. Events are selected where one

\tau

decays to a muon and the other hadronically, and where both

\tau

leptons decay hadronically. These are the most sensitive decay modes for this analysis and together cover about

50\%

of all Higgs-to-tau decays. The analysis uses the angular correlation between the decay planes of

\tau

leptons produced in Higgs boson decays. Machine learning techniques are deployed to distinguish between signal and background events, and dedicated analysis techniques are used to optimise the reconstruction of the

\tau

decay planes. The mixing angle between CP-even and CP-odd

\tau

Yukawa couplings was found to be

4\pm 17^{\circ}

, compared to an expected uncertainty of

\pm 23^{\circ}

at the

68\%

confidence level, while at the

95\%

confidence level the observed (expected) uncertainties were

\pm36^{\circ}

(\pm 55)^{\circ}

. The observed (expected) significance of the separation between the CP-even and CP-odd hypotheses is

3.2

(2.3)

standard deviations. The results are compatible with predictions for the standard model Higgs boson.

Note:

Preliminary results

Monte-Carlo
p p: colliding beams
coupling: Yukawa
p p: scattering
Higgs particle: coupling
Higgs particle: leptonic decay
tau: pair production
tau: decay modes
structure
angular correlation

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Analysis of the CP structure of the Yukawa coupling between the Higgs boson and τ\tauτ leptons in proton-proton collisions at s=13 TeV\sqrt{s}=13~\mathrm{TeV}s​=13 TeV

Citations per year

Analysis of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$