Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Search for Higgs boson pair production in association with top-quark pairs using 196 fb−1 of proton–proton collision data at s=13 and 13.6 TeV with the ATLAS detector. |
| Συγγραφείς: |
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. J., Abidi, S. H., Aboelela, M., Aboulhorma, A., Abramowicz, H., Acharya, B. S., Ackermann, A., Adam Bourdarios, C., Adamczyk, L., Addepalli, S. V., Addison, M. J., Adelman, J., Adiguzel, A., Adye, T., Affolder, A. A. |
| Πηγή: |
Journal of High Energy Physics; Aug2026, Vol. 2026 Issue 8, p1-56, 56p |
| Θεματικοί όροι: |
Top quarks, Proton-proton interactions, Quantum field theory, Units of measurement, Particle physics, Large Hadron Collider |
| Περίληψη: |
This paper presents the first search for non-resonant Higgs boson pair production in association with a top-quark pair (t t ¯ HH) using proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The data sample corresponds to an integrated luminosity of 196 fb−1, comprising 140 fb−1 at a centre-of-mass energy of s = 13 TeV and 56 fb−1 at 13.6 TeV. The search targets three distinct final states expected from t t ¯ HH decays: (i) one lepton (electron or muon) with at least five b-quarks, (ii) at least two b-quarks accompanied by two leptons with the same electric charges or multiple leptons, and (iii) at least three b-quarks with two photons. The t t ¯ HH production cross-section, relative to its Standard Model prediction, is measured to be μ t t ¯ HH = − 3 − 12 + 11 . This result corresponds to a 95% confidence-level upper limit of 20 times the Standard Model prediction for the t t ¯ HH production cross-section, with an expected limit of 21. The Higgs effective field theory Wilson coefficient c t t ¯ HH is also constrained at the same confidence level to the range of − 3.9 < c t t ¯ HH < 3.3 , compared with the expected range of − 4.0 < c t t ¯ HH < 3.5. [ABSTRACT FROM AUTHOR] |
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