| Title: |
Observation of t t ¯ γ γ production at s = 13 TeV with the ATLAS detector |
| Authors: |
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; Bourdarios, C Adam; 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; Tamlihat, M Ait; Aitbenchikh, B; Akbiyik, M; åkesson, T PA; 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, H MJ; Ali, S; Alibocus, SW; Aliev, M; Alimonti, G; Alkakhi, W; Allaire, C; Allbrooke, B MM; Allen, JS; Allen, JF; Allport, PP; Aloisio, A; Alonso, F; Alpigiani, C; Alsolami, Z MK; Fernandez, A Alvarez; Cardoso, M Alves; Alviggi, MG; Aly, M; Coutinho, Y Amaral; Ambler, A; Amelung, C; Amerl, M; Ames, CG; Amezza, T; Amidei, D; Amini, B; Amirie, K; Amirkhanov, A; Dos Santos, SP Amor; 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 |
| Source: |
Physics Letters B, vol 874 |
| Publisher Information: |
eScholarship, University of California |
| Publication Year: |
2026 |
| Collection: |
University of California: eScholarship |
| Subject Terms: |
5106 Nuclear and Plasma Physics (for-2020); 5107 Particle and High Energy Physics (for-2020); 51 Physical Sciences (for-2020); Top-quark pair production in association with two photons; 0105 Mathematical Physics (for); 0201 Astronomical and Space Sciences (for); 0202 Atomic; Molecular; Nuclear; Particle and Plasma Physics (for); Nuclear & Particles Physics (science-metrix); 49 Mathematical sciences (for-2020) |
| Description: |
This paper presents the first observation of top-quark pair production in association with two photons ( t t ¯ γ γ ). 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 t ¯ γ γ 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 + 0.58 fb , corresponding to an observed significance of 5.2 standard deviations. Additionally, the ratio of the production cross section of t t ¯ γ γ to top-quark pair production in association with one photon is determined, yielding ( 3 . 30 − 0.65 + 0.70 ) × 10 − 3 . |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| Relation: |
qt2th9b7zj; https://escholarship.org/uc/item/2th9b7zj |
| DOI: |
10.1016/j.physletb.2026.140195 |
| Availability: |
https://escholarship.org/uc/item/2th9b7zj; https://doi.org/10.1016/j.physletb.2026.140195 |
| Rights: |
CC-BY-NC |
| Accession Number: |
edsbas.7D1344BC |
| Database: |
BASE |