0635498 - FZÚ 2026 RIV DE eng J - Článek v odborném periodiku
Aad, G. - Aakvaag, E. - Abbott, B. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2930 autorů
Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector.
European Physical Journal C. Roč. 85, April (2025), č. článku 416. ISSN 1434-6044. E-ISSN 1434-6052
Grant CEP: GA MŠMT(CZ) EH22_008/0004632
Výzkumná infrastruktura: CERN-CZ III - 90240
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * LHC * Lund jet plane
Obor OECD: Particles and field physics
Impakt faktor: 4.2, rok: 2023 ; AIS: 1.119, rok: 2023
Způsob publikování: Open access
DOI: https://doi.org/10.1140/epjc/s10052-025-13924-5

The Lund jet plane (LJP) is measured for the first time in ttˉ events, using 140 fb−1 of √s=13 TeV pp collision data collected with the ATLAS detector at the LHC. The LJP is a two-dimensional observable of the sub-structure of hadronic jets that acts as a proxy for the kinematics of parton showers and hadron formation. The observable is constructed from charged particles and is measured for R=1.0 anti-kt​ jets with transverse momentum above 350 GeV containing the full decay products of either a top quark or a daughter W boson. The other top quark in the event is identified from its decay into a b-quark, an electron or a muon and a neutrino. The measurement is corrected for detector effects and compared with a range of Monte Carlo predictions sensitive to different aspects of the hadronic decays of the heavy particles. In the W-boson-initiated jets, all the predictions are incompatible with the measurement. In the top quark initiated jets, disagreement with all predictions is observed in smaller subregions of the plane, and with a subset of the predictions across the fiducial plane.

Trvalý link: https://hdl.handle.net/11104/0366568