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 ($$\hbox {t}\overline{\hbox {t}}$$) 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$$\,\text {Ge}\hspace{-.08em}\text {V}$$. The data were collected with the CMS detector at the LHC in proton-proton collisions and correspond to an integrated luminosity of 138$$\,\text {fb}^{-1}$$. The differential $$\hbox {t}\overline{\hbox {t}}$$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 $$173.06 \pm 0.84\,\text {Ge}\hspace{-.08em}\text {V} $$.

Measurement of the differential $$\hbox {t}\overline{\hbox {t}}$$production cross section as a function of the jet mass and extraction of the top quark mass in hadronic decays of boosted top quarks

C. Aimè;S. Calzaferri;D. Fiorina;P. Montagna;C. Riccardi;P. Salvini;I. Vai;P. Vitulo;
2023-01-01

Abstract

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 ($$\hbox {t}\overline{\hbox {t}}$$) 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$$\,\text {Ge}\hspace{-.08em}\text {V}$$. The data were collected with the CMS detector at the LHC in proton-proton collisions and correspond to an integrated luminosity of 138$$\,\text {fb}^{-1}$$. The differential $$\hbox {t}\overline{\hbox {t}}$$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 $$173.06 \pm 0.84\,\text {Ge}\hspace{-.08em}\text {V} $$.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1490181
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