Probing the CP nature of the top–Higgs Yukawa coupling in <math altimg="si1.svg"><mi>t</mi><mover accent="true"><mrow><mi>t</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover><mi>H</mi></math> and tH events with <math altimg="si2.svg"><mi>H</mi><mo stretchy="false">→</mo><mi>b</mi><mover accent="true"><mrow><mi>b</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover></math> decays using the ATLAS detector at the LHC

Aad, Georges; Abbott, Braden Keim; Abbott, Dale; Abeling, Kira; Abidi, Haider; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso; Abulaiti, Yiming; Abusleme, Angel

doi:10.1016/j.physletb.2024.138469

Probing the CP nature of the top–Higgs Yukawa coupling in $t \bar{t} H$ and tH events with $H \to b \bar{b}$ decays using the ATLAS detector at the LHC

ATLAS

Collaboration

Mar 10, 2023

41 pages

Published in:

Phys.Lett.B 849 (2024) 138469

Published: Jan 18, 2024

e-Print:

2303.05974 [hep-ex]

DOI:

10.1016/j.physletb.2024.138469 (publication)

Report number:

CERN-EP-2022-208

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Elsevier B.V.)

The CP properties of the coupling between the Higgs boson and the top quark are investigated using 139 fb⁻¹ of proton–proton collision data recorded by the ATLAS experiment at the LHC at a centre-of-mass energy of

\sqrt{s} = 13

TeV. The CP structure of the top quark–Higgs boson Yukawa coupling is probed in events with a Higgs boson decaying into a pair of b-quarks and produced in association with either a pair of top quarks,

t \bar{t} H

, or a single top quark, tH. Events containing one or two electrons or muons are used for the measurement. Multivariate techniques are used to select regions enriched in

t \bar{t} H

and tH events, where dedicated CP-sensitive observables are exploited. In an extension of the Standard Model (SM) with a CP-odd admixture in the top–Higgs Yukawa coupling, the mixing angle between CP-even and CP-odd couplings is measured to be

α = 11_{- 73^{\circ}}^{\circ + 52^{\circ}}

, compatible with the SM prediction corresponding to

α = 0

.

Note:

41 pages, author list starting at page 24, 3 figures, 4 tables, published by Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2020-03

p p: colliding beams
coupling: Yukawa
top: pair production
p p: scattering
top: single production
Higgs particle: associated production
ATLAS
CERN LHC Coll
Higgs particle: hadronic decay
bottom: pair production

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Probing the CP nature of the top–Higgs Yukawa coupling in tt¯H and tH events with H→bb¯ decays using the ATLAS detector at the LHC

Citations per year

Probing the CP nature of the top–Higgs Yukawa coupling in $t \bar{t} H$ and tH events with $H \to b \bar{b}$ decays using the ATLAS detector at the LHC