$CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow \gamma\gamma$ with the ATLAS Detector

Aad, Georges; Abbott, Brad; Abbott, Dale Charles; Abed Abud, Adam; Abeling, Kira; Abhayasinghe, Deshan Kavishka; Abidi, Syed Haider; Abouzeid, Ossama; Abraham, Nicola; Abramowicz, Halina

doi:10.1103/PhysRevLett.125.061802

$CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow \gamma\gamma$ with the ATLAS Detector

ATLAS

Collaboration

Apr 9, 2020

21 pages

Published in:

Phys.Rev.Lett. 125 (2020) 6, 061802

Published: Aug 6, 2020

e-Print:

2004.04545 [hep-ex]

DOI:

10.1103/PhysRevLett.125.061802 (publication)

PDG:

{\mathit \sigma (}{{\mathit H}}{{\mathit t}}{{\overline{\mathit t}}}{)}

/

{\mathit \sigma (}{{\mathit H}}{{\mathit t}}{{\overline{\mathit t}}}{)}_{SM}

Report number:

CERN-EP-2020-046

Experiments:

CERN-LHC-ATLAS

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Abstract: (APS)

A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production in association with a top quark pair (tt¯H) or single top quark (tH) is studied. The analysis uses 139 fb-1 of proton–proton collision data recorded at a center-of-mass energy of s=13 TeV with the ATLAS detector at the Large Hadron Collider. Assuming a CP-even coupling, the tt¯H process is observed with a significance of 5.2 standard deviations. The measured cross section times H→γγ branching ratio is 1.64-0.36+0.38(stat)-0.14+0.17(sys) fb, and the measured rate for tt¯H is 1.43-0.31+0.33(stat)-0.15+0.21(sys) times the Standard Model expectation. The tH production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A CP-mixing angle greater (less) than 43 (-43)° is excluded at 95% confidence level.

Note:

29 pages in total, author list starting page 13, 3 figures, no tables, published in Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2019-01/

Elementary Particles and Fields
p p: colliding beams
top: decay modes
top: pair production
top: single production
Higgs particle: associated production
Higgs particle: interaction
p p: scattering
Higgs particle: radiative decay
photon: pair production

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CPCPCP Properties of Higgs Boson Interactions with Top Quarks in the ttˉHt\bar{t}HttˉH and tHtHtH Processes Using H→γγH \rightarrow \gamma\gammaH→γγ with the ATLAS Detector

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$CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow \gamma\gamma$ with the ATLAS Detector