• Browse all
Measurement of the jet mass distribution and top quark mass in hadronic decays of boosted top quarks in pp collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
Phys.Rev.Lett. 124 (2020) 202001, 2020.

Abstract (data abstract)
A measurement is reported of the jet mass distribution in hadronic decays of boosted top quarks produced in \pp collisions at $\sqrt{s}=13\,\mathrm{TeV}$. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of $35.9\,\mathrm{fb}^{-1}$. The measurement is performed in the lepton+jets channel of $\mathrm{t}\overline{\mathrm{t}}$ events, where the lepton is an electron or muon. The products of the hadronic top quark decay $\mathrm{t} \rightarrow \mathrm{b}\mathrm{W} \rightarrow \mathrm{b}\mathrm{q}\mathrm{q}'$ are reconstructed as a single jet with transverse momentum larger than $400\,\mathrm{GeV}$. The $\mathrm{t}\overline{\mathrm{t}}$ cross section as a function of the jet mass is unfolded at the particle level and used to extract a value of the top quark mass of $172.6 \pm 2.5\,\mathrm{GeV}$. A novel jet reconstruction technique is used for the first time at the LHC, which improves the precision by a factor of three relative to an earlier measurement. This highlights the potential of measurements using boosted top quarks, where the new technique will enable future precision measurements.

  • Figure 1

    Contents of Figure 1

    10.17182/hepdata.93067.v1/t1

    Reconstructed distribution of $m_\mathrm{jet}$ after the full event selection in the lepton+jets channel.

  • Figure 2 a

    Contents of Figure 2a

    10.17182/hepdata.93067.v1/t2

    The particle-level $\mathrm{t}\overline{\mathrm{t}}$ differential cross section in the fiducial region as a function of the XCone-jet mass.

  • Figure 2 b

    Contents of Figure 2b

    10.17182/hepdata.93067.v1/t3

    The normalized particle-level $\mathrm{t}\overline{\mathrm{t}}$ differential cross section in the fiducial region as a function of the XCone-jet mass.

  • Figure 2a Stat Covariances

    Covariances of stat uncertainties of Figure 2a

    10.17182/hepdata.93067.v1/t4

    The covariance matrix containing the statistical uncertainties of Figure 2a is shown.

  • Figure 2a Experimental Covariances

    Covariances of exp uncertainties of Figure 2a

    10.17182/hepdata.93067.v1/t5

    The covariance matrix containing the experimental uncertainties of Figure 2a is shown.

  • Figure 2a Model Covariances

    Covariances of model uncertainties of Figure 2a

    10.17182/hepdata.93067.v1/t6

    The covariance matrix containing the model uncertainties of Figure 2a is shown.

  • Figure 2b Stat Covariances

    Covariances of stat uncertainties of Figure 2b

    10.17182/hepdata.93067.v1/t7

    The covariance matrix containing the statistical uncertainties of Figure 2b is shown.

  • Figure 2b Experimental Covariances

    Covariances of exp uncertainties of Figure 2b

    10.17182/hepdata.93067.v1/t8

    The covariance matrix containing the experimental uncertainties of Figure 2b is shown.

  • Figure 2b Model Covariances

    Covariances of model uncertainties of Figure 2b

    10.17182/hepdata.93067.v1/t9

    The covariance matrix containing the model uncertainties of Figure 2b is shown.

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.