Measurement of the differential $$\hbox {t}\overline{\hbox {t}}$$ t 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
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 ( $$\hbox...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2023
|
| Online Access: | https://hdl.handle.net/1721.1/151068 |
| Summary: | Abstract
A measurement of the jet mass distribution in hadronic decays of Lorentz-boosted top quarks is presented. The measurement is performed in the lepton + jets channel of top quark pair production (
$$\hbox {t}\overline{\hbox {t}}$$
t
t
¯
) events, where the lepton is an electron or muon. The products of the hadronic top quark decay are reconstructed using a single large-radius jet with transverse momentum greater than 400
$$\,\text {Ge}\hspace{-.08em}\text {V}$$
Ge
V
. The data were collected with the CMS detector at the LHC in proton-proton collisions and correspond to an integrated luminosity of 138
$$\,\text {fb}^{-1}$$
fb
-
1
. The differential
$$\hbox {t}\overline{\hbox {t}}$$
t
t
¯
production cross section as a function of the jet mass is unfolded to the particle level and is used to extract the top quark mass. The jet mass scale is calibrated using the hadronic W boson decay within the large-radius jet. The uncertainties in the modelling of the final state radiation are reduced by studying angular correlations in the jet substructure. These developments lead to a significant increase in precision, and a top quark mass of
$$173.06 \pm 0.84\,\text {Ge}\hspace{-.08em}\text {V} $$
173.06
±
0.84
Ge
V
. |
|---|