Measurement of the Differential tt¯ Production Cross Section as a Function of the Jet Mass and Extraction of the Top Quark Mass in Hadronic Decays of Boosted Top Quarks

The European Physical Journal C 2023
Kārlis Dreimanis, Guntis Pikurs, Markus Seidel, Viesturs Veckalns, CMS Collaboration

A measurement of the jet mass distribution in hadronic decays of Lorentz-boosted top quarks is presented. The measurement is performed in the lepton + jets channel of top quark pair production () events, where the lepton is an electron or muon. The products of the hadronic top quark decay are reconstructed using a single large-radius jet with transverse momentum greater than 400. The data were collected with the CMS detector at the LHC in proton-proton collisions and correspond to an integrated luminosity of 138. The differential production cross section as a function of the jet mass is unfolded to the particle level and is used to extract the top quark mass. The jet mass scale is calibrated using the hadronic W boson decay within the large-radius jet. The uncertainties in the modelling of the final state radiation are reduced by studying angular correlations in the jet substructure. These developments lead to a significant increase in precision, and a top quark mass of .

DOI
10.1140/epjc/s10052-023-11587-8
Hyperlink
https://link.springer.com/article/10.1140/epjc/s10052-023-11587-8

The CMS Collaboration, A.Tumasyan, K.Dreimanis, G.Pikurs, M.Seidel, V.Veckalns ... [et al.]. Measurement of the Differential tt¯ Production Cross Section as a Function of the Jet Mass and Extraction of the Top Quark Mass in Hadronic Decays of Boosted Top Quarks. The European Physical Journal C, 2023, Vol. 83, No. 7, Article number 560. ISSN 1434-6044. e-ISSN 1434-6052. Available from: doi:10.1140/epjc/s10052-023-11587-8

Publication language
English (en)