Articles

Measurements of inclusive and differential cross-sections of 𝑑𝑑̄𝛾 production in 𝑝𝑝 collisions at √s= 13 TeV with the ATLAS detector

Aad, G.; Aakvaag, E.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; 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.; Afik, Y.; Agaras, M. N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; Ahmad, A.; Ahmadov, F.; Ahmed, W. S.; Ahuja, S.; Ai, X.; Aielli, G.; Aikot, A.; Ait Tamlihat, M.; Aitbenchikh, B.; Aizenberg, I.; Akbiyik, M.; Γ…kesson, T. P. A.; Akimov, A. V.; Akiyama, D.; Al Khoury, Konie

Abstract Inclusive and differential cross-sections are measured at particle level for the associated production of a top quark pair and a photon (𝑑𝑑̄𝛾). The analysis is performed using an integrated luminosity of 140 fb⁻¹ of proton-proton collisions at a centre-of-mass energy of 13 TeV collected by the ATLAS detector. The measurements are performed in the single-lepton and dilepton top quark pair decay channels focusing on t t Β― Ξ³ topologies where the photon is radiated from an initial-state parton or one of the top quarks. The absolute and normalised differential cross-sections are measured for several variables characterising the photon, lepton and jet kinematics as well as the angular separation between those objects.

The observables are found to be in good agreement with the Monte Carlo predictions. The photon transverse momentum differential distribution is used to set limits on effective field theory parameters related to the electroweak dipole moments of the top quark. The combined limits using the photon and the 𝑍 boson transverse momentum measured in 𝑑𝑑̄ production in associations with a 𝑍 boson are also set.

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Also Published In

Title
Journal of High Energy Physics
DOI
https://doi.org/10.1007/JHEP10(2024)191

More About This Work

Academic Units
Physics
Published Here
January 29, 2025

Notes

Hadron-Hadron Scattering

SWORD deposit contains more than 40 names, only first 40 processed. See mets.xml for full list. Large number of Name fields will generate error in Hyacinth. See JIRA ticket SWORD-86.