CERN Accelerating science

(upper left) Reconstructed top-quark mass from the kinematic fit, (upper right) average reconstructed W-boson mass, (lower left) goodness-of-fit probability, and (lower right) the separation of the two b-tagged jets after all selection steps. The simulated \ttbar signal and the background from event mixing are normalized to data. The band indicates the correlated uncertainty from the signal fraction $f_\text{sig}$. The top-quark mass used in the simulation is 172.5\GeV and the nominal jet energy scale is applied.

(upper left) Reconstructed top-quark mass from the kinematic fit, (upper right) average reconstructed W-boson mass, (lower left) goodness-of-fit probability, and (lower right) the separation of the two b-tagged jets after all selection steps. The simulated \ttbar signal and the background from event mixing are normalized to data. The band indicates the correlated uncertainty from the signal fraction $f_\text{sig}$. The top-quark mass used in the simulation is 172.5\GeV and the nominal jet energy scale is applied.

(upper left) Reconstructed top-quark mass from the kinematic fit, (upper right) average reconstructed W-boson mass, (lower left) goodness-of-fit probability, and (lower right) the separation of the two b-tagged jets after all selection steps. The simulated \ttbar signal and the background from event mixing are normalized to data. The band indicates the correlated uncertainty from the signal fraction $f_\text{sig}$. The top-quark mass used in the simulation is 172.5\GeV and the nominal jet energy scale is applied.

(upper left) Reconstructed top-quark mass from the kinematic fit, (upper right) average reconstructed W-boson mass, (lower left) goodness-of-fit probability, and (lower right) the separation of the two b-tagged jets after all selection steps. The simulated \ttbar signal and the background from event mixing are normalized to data. The band indicates the correlated uncertainty from the signal fraction $f_\text{sig}$. The top-quark mass used in the simulation is 172.5\GeV and the nominal jet energy scale is applied.

Difference between the extracted top-quark mass $ m_{\cPqt,\,\text{ext}}$ and the generated top-quark mass $m_{\cPqt,\,\text{gen}}$, (upper) and between the extracted and generated values of JES (lower) before calibration, for different generated top-quark masses and three different JES values. The lines correspond to linear fits which are used to correct the final likelihoods. The mass points for different JES values are shifted horizontally for clarity.

(\cmsLeft) Difference between the calibrated top-quark mass $ m_{\cPqt,\,\text{cal}}$ and the generated top-quark mass $m_{\cPqt,\,\text{gen}}$, and between the calibrated and the generated values of JES after calibration for different generated top-quark masses and three different JES values; (\cmsRight) width of the pull distribution for the calibrated top-quark mass and for the calibrated JES for different generated top-quark masses and three different JES values. The colored lines correspond to linear fits for individual values of JES and the black line corresponds to a linear (\cmsLeft) or constant (\cmsRight) fit to all calibration points. The mass points for different JES values are shifted horizontally for clarity.

(\cmsLeft) Difference between the calibrated top-quark mass $ m_{\cPqt,\,\text{cal}}$ and the generated top-quark mass $m_{\cPqt,\,\text{gen}}$, and between the calibrated and the generated values of JES after calibration for different generated top-quark masses and three different JES values; (\cmsRight) width of the pull distribution for the calibrated top-quark mass and for the calibrated JES for different generated top-quark masses and three different JES values. The colored lines correspond to linear fits for individual values of JES and the black line corresponds to a linear (\cmsLeft) or constant (\cmsRight) fit to all calibration points. The mass points for different JES values are shifted horizontally for clarity.

(left) The 1D likelihood profile with the JES fixed to unity and (right) the 2D likelihood. The contours correspond to $1\sigma$, $2\sigma$, and $3\sigma$ statistical uncertainties.

(left) The 1D likelihood profile with the JES fixed to unity and (right) the 2D likelihood. The contours correspond to $1\sigma$, $2\sigma$, and $3\sigma$ statistical uncertainties.

Overview of the CMS top-quark mass measurements, their combination that is also shown as the shaded band, and the Tevatron average. The inner error bars indicate the statistical uncertainty, the outer error bars indicate the total uncertainty. The statistical uncertainty in the in situ fit for the JES is treated as a systematic uncertainty.