Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at s= 13 TeV and 13.6 TeV by the ATLAS experiment

L.ZwalinskiThe ATLAS Collaboration

doi:10.1016/j.physletb.2026.140280

Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at s= 13 TeV and 13.6 TeV by the ATLAS experiment

L.ZwalinskiThe ATLAS Collaboration

Physics

Aix-Marseille Université
University of Bergen
University of Oklahoma
New York University Abu Dhabi
University of Göttingen
TU Dortmund University
United States Department of Energy
Southern Methodist University
Mohammed V University in Rabat
Tel Aviv University
New York University
National Institute for Nuclear Physics
Abdus Salam International Centre for Theoretical Physics
Heidelberg University
Université de Savoie
AGH University of Krakow
SLAC National Accelerator Laboratory
University of Manchester
Northern Illinois University
Istanbul University
Rutherford Appleton Laboratory
University of California at Santa Cruz
The University of Chicago
Institute for High Energy Physics
Johannes Gutenberg University Mainz
Alexandru Ioan Cuza University of Iaşi
CERN
Royal Holloway University of London
Zhengzhou University
University of Rome Tor Vergata
University of Valencia
University of Hassan II Casablanca
Lund University
Stony Brook University
Waseda University
University of Bonn
University of Würzburg
University of Victoria BC
University of Bern
Université Grenoble Alpes
University of Edinburgh
Oklahoma State University
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Technical University of Athens

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

Abstract

A search for Higgs boson pair production in the bb¯γγ final state is performed. The proton–proton collision dataset corresponds to an integrated luminosity of 308 fb⁻¹, consisting of two samples, 140 fb⁻¹ at a centre-of-mass energy of s=13TeV and 168 fb⁻¹ at s=13.6TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same final state through several methodological and technical developments. The Higgs boson pair production cross section divided by the Standard Model prediction is found to be μ_HH=0.9_−1.1^+1.4 (μ_HH=1_−1.0^+1.3 expected), which translates into a 95% confidence-level upper limit of μ_HH ' 3.7. At the same confidence level the Higgs self-coupling modifier is constrained to be in the range −1.6'κ_λ'6.6 (−1.8'κ_λ'6.9 expected).

Original language	English
Article number	140280
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	876
DOIs	https://doi.org/10.1016/j.physletb.2026.140280
State	Published - May 2026

Keywords

ATLAS
B-jets
Di-Higgs
Photons
Run 3
Self-interaction

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10.1016/j.physletb.2026.140280

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@article{96851e4923ef49c2aca19f736eab76d0,

title = "Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at s= 13 TeV and 13.6 TeV by the ATLAS experiment",

abstract = "A search for Higgs boson pair production in the bb¯γγ final state is performed. The proton–proton collision dataset corresponds to an integrated luminosity of 308 fb−1, consisting of two samples, 140 fb−1 at a centre-of-mass energy of s=13TeV and 168 fb−1 at s=13.6TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same final state through several methodological and technical developments. The Higgs boson pair production cross section divided by the Standard Model prediction is found to be μHH=0.9−1.1+1.4 (μHH=1−1.0+1.3 expected), which translates into a 95\% confidence-level upper limit of μHH ' 3.7. At the same confidence level the Higgs self-coupling modifier is constrained to be in the range −1.6'κλ'6.6 (−1.8'κλ'6.9 expected).",

keywords = "ATLAS, B-jets, Di-Higgs, Photons, Run 3, Self-interaction",

author = "\{L.ZwalinskiThe ATLAS Collaboration\} and G. Aad and E. Aakvaag and B. Abbott and S. Abdelhameed and K. Abeling and Abicht, \{N. J.\} and Abidi, \{S. H.\} and M. Aboelela and A. Aboulhorma and H. Abramowicz and Y. Abulaiti and Acharya, \{B. S.\} and A. Ackermann and \{Adam Bourdarios\}, C. and L. Adamczyk and Addepalli, \{S. V.\} and Addison, \{M. J.\} and J. Adelman and A. Adiguzel and T. Adye and Affolder, \{A. A.\} and Y. Afik and Agaras, \{M. N.\} and A. Aggarwal and C. Agheorghiesei and F. Ahmadov and S. Ahuja and X. Ai and G. Aielli and A. Aikot and \{Ait Tamlihat\}, M. and B. Aitbenchikh and M. Akbiyik and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and D. Akiyama and Akolkar, \{N. N.\} and S. Aktas and Alberghi, \{G. L.\} and J. Albert and U. Alberti and P. Albicocco and Albouy, \{G. L.\} and S. Alderweireldt and Alegria, \{Z. L.\} and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and T. Alexopoulos and \{Mc Lean\}, \{C. A.\}",

note = "Publisher Copyright: {\textcopyright} 2026 The Authors.",

year = "2026",

month = may,

doi = "10.1016/j.physletb.2026.140280",

language = "English",

volume = "876",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at s= 13 TeV and 13.6 TeV by the ATLAS experiment. / L.ZwalinskiThe ATLAS Collaboration.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 876, 140280, 05.2026.

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

TY - JOUR

T1 - Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at s= 13 TeV and 13.6 TeV by the ATLAS experiment

AU - L.ZwalinskiThe ATLAS Collaboration

AU - Aad, G.

AU - Aakvaag, E.

AU - Abbott, B.

AU - Abdelhameed, S.

AU - Abeling, K.

AU - Abicht, N. J.

AU - Abidi, S. H.

AU - Aboelela, M.

AU - Aboulhorma, A.

AU - Abramowicz, H.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Ackermann, A.

AU - Adam Bourdarios, C.

AU - Adamczyk, L.

AU - Addepalli, S. V.

AU - Addison, M. J.

AU - Adelman, J.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agaras, M. N.

AU - Aggarwal, A.

AU - Agheorghiesei, C.

AU - Ahmadov, F.

AU - Ahuja, S.

AU - Ai, X.

AU - Aielli, G.

AU - Aikot, A.

AU - Ait Tamlihat, M.

AU - Aitbenchikh, B.

AU - Akbiyik, M.

AU - Åkesson, T. P.A.

AU - Akimov, A. V.

AU - Akiyama, D.

AU - Akolkar, N. N.

AU - Aktas, S.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Alberti, U.

AU - Albicocco, P.

AU - Albouy, G. L.

AU - Alderweireldt, S.

AU - Alegria, Z. L.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexopoulos, T.

AU - Mc Lean, C. A.

PY - 2026/5

Y1 - 2026/5

N2 - A search for Higgs boson pair production in the bb¯γγ final state is performed. The proton–proton collision dataset corresponds to an integrated luminosity of 308 fb−1, consisting of two samples, 140 fb−1 at a centre-of-mass energy of s=13TeV and 168 fb−1 at s=13.6TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same final state through several methodological and technical developments. The Higgs boson pair production cross section divided by the Standard Model prediction is found to be μHH=0.9−1.1+1.4 (μHH=1−1.0+1.3 expected), which translates into a 95% confidence-level upper limit of μHH ' 3.7. At the same confidence level the Higgs self-coupling modifier is constrained to be in the range −1.6'κλ'6.6 (−1.8'κλ'6.9 expected).

AB - A search for Higgs boson pair production in the bb¯γγ final state is performed. The proton–proton collision dataset corresponds to an integrated luminosity of 308 fb−1, consisting of two samples, 140 fb−1 at a centre-of-mass energy of s=13TeV and 168 fb−1 at s=13.6TeV, recorded between 2015 and 2024 by the ATLAS detector at the CERN Large Hadron Collider. In addition to a larger dataset, this analysis improves upon the previous search in the same final state through several methodological and technical developments. The Higgs boson pair production cross section divided by the Standard Model prediction is found to be μHH=0.9−1.1+1.4 (μHH=1−1.0+1.3 expected), which translates into a 95% confidence-level upper limit of μHH ' 3.7. At the same confidence level the Higgs self-coupling modifier is constrained to be in the range −1.6'κλ'6.6 (−1.8'κλ'6.9 expected).

KW - ATLAS

KW - B-jets

KW - Di-Higgs

KW - Photons

KW - Run 3

KW - Self-interaction

UR - https://www.scopus.com/pages/publications/105036668807

U2 - 10.1016/j.physletb.2026.140280

DO - 10.1016/j.physletb.2026.140280

M3 - Article

AN - SCOPUS:105036668807

SN - 0370-2693

VL - 876

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 140280

ER -

Study of Higgs boson pair production in the HH→bb‾γγ final state with 308 fb−1 of data collected at s= 13 TeV and 13.6 TeV by the ATLAS experiment

Abstract

Keywords

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