Searches for exclusive Higgs boson decays into D⁎γ and Z boson decays into D0γ and <math altimg="si1.svg"><msubsup><mrow><mi>K</mi></mrow><mrow><mi>s</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mi>γ</mi></math> in pp collisions at <math altimg="si2.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.25em"/><mtext mathvariant="normal">TeV</mtext></math> with the ATLAS detector

Aad, Georges; Aakvaag, Erlend; Abbott, Braden Keim; Abeling, Kira; Abicht, Nils Julius; Abidi, Haider; Aboelela, Mohammed; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso

doi:10.1016/j.physletb.2024.138762

Searches for exclusive Higgs boson decays into D⁎γ and Z boson decays into D0γ and $K_{s}^{0} γ$ in pp collisions at $\sqrt{s} = 13 TeV$ with the ATLAS detector

ATLAS

Collaboration

Feb 28, 2024

25 pages

Published in:

Phys.Lett.B 855 (2024) 138762

Published: Jun 3, 2024

e-Print:

2402.18731 [hep-ex]

DOI:

10.1016/j.physletb.2024.138762 (publication)

Report number:

CERN-EP-2024-037

Experiments:

CERN-LHC-ATLAS

View in:

datasets

reference search5 citations

Citations per year

Abstract: (Elsevier B.V.)

Searches for exclusive decays of the Higgs boson into

D^{⁎} γ

and of the Z boson into

D^{0} γ

and

K_{s}^{0} γ

can probe flavour-violating Higgs boson and Z boson couplings to light quarks. Searches for these decays are performed with a pp collision data sample corresponding to an integrated luminosity of 136.3 fb⁻¹ collected at

\sqrt{s} = 13 TeV

between 2016–2018 with the ATLAS detector at the CERN Large Hadron Collider. In the

D^{⁎} γ

and

D^{0} γ

channels, the observed (expected) 95% confidence-level upper limits on the respective branching fractions are

B (H \to D^{⁎} γ) < 1.0 (1.2) \times 10^{- 3}

,

B (Z \to D^{0} γ) < 4.0 (3.4) \times 10^{- 6}

, while the corresponding results in the

K_{s}^{0} γ

channel are

B (Z \to K_{s}^{0} γ) < 3.1 (3.0) \times 10^{- 6}

.

Note:

All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-52

p p: scattering
p p: colliding beams
Higgs particle: radiative decay
Z0: radiative decay
Higgs particle: rare decay
Z0: rare decay
Z0: coupling
ATLAS
Higgs particle: branching ratio: upper limit
Z0: branching ratio: upper limit

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