Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector

ATLAS Publications; T.M. Carter; R.Y. Gonzalez Andana; A. Hasib; V.A. Parrish; E.A. Pender; T. Qiu; E.P. Takeva; N. Themistokleous; E.M. Villhauer; E. Zaid

doi:10.1016/j.physletb.2023.138292

Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, V.A. Parrish, E.A. Pender, T. Qiu, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Searches for the exclusive decays of the Higgs boson to an 𝜔 meson and a photon or a 𝐾∗ meson and a photon can probe flavour-conserving and flavour-violating Higgs boson couplings to light quarks, respectively. Searches
for these decays, along with the analogous 𝑍 boson decay to an 𝜔 meson and a photon, are performed with a 𝑝𝑝 collision data sample corresponding to integrated luminosities of up to 134 fb−1 collected at √𝑠 = 13 TeV with
the ATLAS detector at the CERN Large Hadron Collider. The obtained 95% confidence-level upper limits on the respective branching fractions are β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 .
The limits for 𝐻 → 𝜔𝛾 and 𝑍 → 𝜔𝛾 are 370 times and 140 times the Standard Model expected values, respectively. The result for 𝑍 → 𝜔𝛾 corresponds to a two-orders-of-magnitude improvement over the limit obtained by the
DELPHI experiment at LEP.

Original language	English
Article number	138292
Pages (from-to)	1-23
Number of pages	23
Journal	Physics Letters B
Volume	847
DOIs	https://doi.org/10.1016/j.physletb.2023.138292
Publication status	Published - 10 Dec 2023

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http://arxiv.org/abs/2301.09938

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5 Finished

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/04/23 → 30/09/25
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/10/22 → 30/09/25
Project: Research

Cite this

ATLAS Publications, Carter, T. M., Gonzalez Andana, R. Y., Hasib, A., Parrish, V. A., Pender, E. A., Qiu, T., Takeva, E. P., Themistokleous, N., Villhauer, E. M., & Zaid, E. (2023). Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector. Physics Letters B, 847, 1-23. Article 138292. https://doi.org/10.1016/j.physletb.2023.138292

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title = "Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector",

abstract = "Searches for the exclusive decays of the Higgs boson to an 𝜔 meson and a photon or a 𝐾∗ meson and a photon can probe flavour-conserving and flavour-violating Higgs boson couplings to light quarks, respectively. Searches for these decays, along with the analogous 𝑍 boson decay to an 𝜔 meson and a photon, are performed with a 𝑝𝑝 collision data sample corresponding to integrated luminosities of up to 134 fb−1 collected at √𝑠 = 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The obtained 95\% confidence-level upper limits on the respective branching fractions are β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 . The limits for 𝐻 → 𝜔𝛾 and 𝑍 → 𝜔𝛾 are 370 times and 140 times the Standard Model expected values, respectively. The result for 𝑍 → 𝜔𝛾 corresponds to a two-orders-of-magnitude improvement over the limit obtained by the DELPHI experiment at LEP.",

author = "\{ATLAS Publications\} and Clark, \{Philip James\} and Sinead Farrington and Yanyan Gao and Christos Leonidopoulos and Martin, \{Victoria Jane\} and Liza Mijovic and Benjamin Wynne and Sara Alderweireldt and T.M. Carter and \{Gonzalez Andana\}, R.Y. and A. Hasib and V.A. Parrish and E.A. Pender and T. Qiu and E.P. Takeva and N. Themistokleous and E.M. Villhauer and E. Zaid",

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doi = "10.1016/j.physletb.2023.138292",

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T1 - Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector

AU - ATLAS Publications

AU - Clark, Philip James

AU - Farrington, Sinead

AU - Gao, Yanyan

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mijovic, Liza

AU - Wynne, Benjamin

AU - Alderweireldt, Sara

AU - Carter, T.M.

AU - Gonzalez Andana, R.Y.

AU - Hasib, A.

AU - Parrish, V.A.

AU - Pender, E.A.

AU - Qiu, T.

AU - Takeva, E.P.

AU - Themistokleous, N.

AU - Villhauer, E.M.

AU - Zaid, E.

PY - 2023/12/10

Y1 - 2023/12/10

N2 - Searches for the exclusive decays of the Higgs boson to an 𝜔 meson and a photon or a 𝐾∗ meson and a photon can probe flavour-conserving and flavour-violating Higgs boson couplings to light quarks, respectively. Searches for these decays, along with the analogous 𝑍 boson decay to an 𝜔 meson and a photon, are performed with a 𝑝𝑝 collision data sample corresponding to integrated luminosities of up to 134 fb−1 collected at √𝑠 = 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The obtained 95% confidence-level upper limits on the respective branching fractions are β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 . The limits for 𝐻 → 𝜔𝛾 and 𝑍 → 𝜔𝛾 are 370 times and 140 times the Standard Model expected values, respectively. The result for 𝑍 → 𝜔𝛾 corresponds to a two-orders-of-magnitude improvement over the limit obtained by the DELPHI experiment at LEP.

AB - Searches for the exclusive decays of the Higgs boson to an 𝜔 meson and a photon or a 𝐾∗ meson and a photon can probe flavour-conserving and flavour-violating Higgs boson couplings to light quarks, respectively. Searches for these decays, along with the analogous 𝑍 boson decay to an 𝜔 meson and a photon, are performed with a 𝑝𝑝 collision data sample corresponding to integrated luminosities of up to 134 fb−1 collected at √𝑠 = 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The obtained 95% confidence-level upper limits on the respective branching fractions are β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 . The limits for 𝐻 → 𝜔𝛾 and 𝑍 → 𝜔𝛾 are 370 times and 140 times the Standard Model expected values, respectively. The result for 𝑍 → 𝜔𝛾 corresponds to a two-orders-of-magnitude improvement over the limit obtained by the DELPHI experiment at LEP.

U2 - 10.1016/j.physletb.2023.138292

DO - 10.1016/j.physletb.2023.138292

M3 - Article

SN - 0370-2693

VL - 847

SP - 1

EP - 23

JO - Physics Letters B

JF - Physics Letters B

M1 - 138292

ER -

Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector

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Projects

Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Cite this