This paper presents the first observation of top-quark pair production in association with two photons (t tbar gamma gamma). 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 t tbar gamma gamma production cross section, measured in a fiducial phase space based on particle-level kinematic criteria for the lepton, photons, and jets, is found tobe (2.42+0.58-0.53) fb, corresponding to an observed significance of 5.2 standard deviations. Additionally, the ratio of the production cross section of t tbar gamma gamma to top-quark pair production in association with one photon is determined, yielding (3.30+0.70-0.65) × 10-3.

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.j., et al. (2026). Observation of t tbar gamma gamma production at root s = 13 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 874 [10.1016/j.physletb.2026.140195].

Observation of t tbar gamma gamma production at root s = 13 TeV with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

This paper presents the first observation of top-quark pair production in association with two photons (t tbar gamma gamma). 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 t tbar gamma gamma production cross section, measured in a fiducial phase space based on particle-level kinematic criteria for the lepton, photons, and jets, is found tobe (2.42+0.58-0.53) fb, corresponding to an observed significance of 5.2 standard deviations. Additionally, the ratio of the production cross section of t tbar gamma gamma to top-quark pair production in association with one photon is determined, yielding (3.30+0.70-0.65) × 10-3.
2026
Pubblicato
Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.j., et al. (2026). Observation of t tbar gamma gamma production at root s = 13 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 874 [10.1016/j.physletb.2026.140195].
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Acharya, Bs;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/452924
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