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Observation of tt¯γγ production at s=13 TeV with the ATLAS detector
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Observation of tt¯γγ production at s=13 TeV with the ATLAS detector

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N.J. Abicht, S.H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
Physics letters. B, 卷.874, 140195
01/03/2026
Web of Science ID: WOS:001710126200001

摘要

Top-quark pair production in association with two photons
This paper presents the first observation of top-quark pair production in association with two photons (tt¯γγ). The measurement is performed in the single-lepton decay channel using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. The data correspond to an integrated luminosity of 140 fb−1 recorded during Run 2 at a centre-of-mass energy of 13 TeV. The tt¯γγ production cross section, measured in a fiducial phase space based on particle-level kinematic criteria for the lepton, photons, and jets, is found to be 2.42−0.53+0.58fb, corresponding to an observed significance of 5.2 standard deviations. Additionally, the ratio of the production cross section of tt¯γγ to top-quark pair production in association with one photon is determined, yielding (3.30−0.65+0.70)×10−3.

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https://doi.org/10.1016/j.physletb.2026.140195檢視
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引用書目主題
5 Physics
5.9 Particles & Fields
5.9.19 Beyond Standard Model
Web Of Science研究領域
Astronomy & Astrophysics
Physics, Nuclear
Physics, Particles & Fields
ESI研究領域
Physics

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