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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

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Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, NJ; Abidi, SH; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
May 1, 2026

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+1.4HH=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).

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Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

ISSN

0370-2693

Publication Date

May 1, 2026

Volume

876

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
 

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Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. J., … Aoki, M. (2026). 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. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 876. https://doi.org/10.1016/j.physletb.2026.140280
Aad, G., E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, et al. “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.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 876 (May 1, 2026). https://doi.org/10.1016/j.physletb.2026.140280.
Aad G, Aakvaag E, Abbott B, Abdelhameed S, Abeling K, Abicht NJ, et al. 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. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2026 May 1;876.
Aad, G., et al. “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.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, vol. 876, May 2026. Scopus, doi:10.1016/j.physletb.2026.140280.
Aad G, Aakvaag E, Abbott B, Abdelhameed S, Abeling K, Abicht NJ, Abidi SH, Aboelela M, Aboulhorma A, Abramowicz H, Abulaiti Y, Acharya BS, Ackermann A, Adam Bourdarios C, Adamczyk L, Addepalli SV, Addison MJ, Adelman J, Adiguzel A, Adye T, Affolder AA, Afik Y, Agaras MN, Aggarwal A, Agheorghiesei C, Ahmadov F, Ahuja S, Ai X, Aielli G, Aikot A, Ait Tamlihat M, Aitbenchikh B, Akbiyik M, Åkesson TPA, Akimov AV, Akiyama D, Akolkar NN, Aktas S, Alberghi GL, Albert J, Alberti U, Albicocco P, Albouy GL, Alderweireldt S, Alegria ZL, Aleksa M, Aleksandrov IN, Alexa C, Alexopoulos T, Alfonsi F, Algren M, Alhroob M, Ali B, Ali HMJ, Ali S, Alibocus SW, Aliev M, Alimonti G, Alkakhi W, Allaire C, Allbrooke BMM, Allen JS, Allen JF, Allport PP, Aloisio A, Alonso F, Alpigiani C, Alsolami ZMK, Alvarez Fernandez A, Alves Cardoso M, Alviggi MG, Aly M, Amaral Coutinho Y, Ambler A, Amelung C, Amerl M, Ames CG, Amezza T, Amidei D, Amini B, Amirie K, Amirkhanov A, Amor Dos Santos SP, Amos KR, Amperiadou D, An S, Anastopoulos C, Andeen T, Anders JK, Anderson AC, Andreazza A, Angelidakis S, Angerami A, Anisenkov AV, Annovi A, Antel C, Antipov E, Antonelli M, Anulli F, Aoki M. 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. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2026 May 1;876.
Journal cover image

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

ISSN

0370-2693

Publication Date

May 1, 2026

Volume

876

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences