Search for a W' boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 09 (2022) 088, 2022.

Abstract (data abstract)
A search is presented for a heavy $\mathrm{W\prime}$ boson resonance decaying to a $\mathrm{B}$ or $\mathrm{T}$ vector-like quark and a $\mathrm{t}$ or a $\mathrm{b}$ quark, respectively. The analysis is performed using proton-proton collisions collected with the CMS detector at the LHC. The data correspond to an integrated luminosity of 138 $\mathrm{fb}^{-1}$ at a center-of-mass energy of 13 TeV. Both decay channels result in a signature with a $\mathrm{t}$ quark, a Higgs or $\mathrm{Z}$ boson, and a $\mathrm{b}$ quark, each produced with a significant Lorentz boost. The all-hadronic decays of the Higgs or $\mathrm{Z}$ boson and of the $\mathrm{t}$ quark are selected using jet substructure techniques to reduce standard model backgrounds, resulting in a distinct three-jet $\mathrm{W\prime}$ boson decay signature. No significant deviation in data with respect to the standard model background prediction is observed. Upper limits are set at 95\% confidence level on the product of the $\mathrm{W\prime}$ boson cross section and the final state branching fraction. A $\mathrm{W\prime}$ boson with a mass below 3.2 TeV is excluded, given the benchmark model assumption of democratic branching fractions. In addition, limits are set based on generalizations of these assumptions. These are the most sensitive limits to date for this final state.

  • tHb mass in the signal region

    Figure_006-a

    10.17182/hepdata.127138.v1/t1

    Reconstructed W′ boson mass distributions in the tHb signal region.

  • tZb mass in the signal region

    Figure_006-b

    10.17182/hepdata.127138.v1/t2

    Reconstructed W′ boson mass distributions in the tZb signal region.

  • center VLQ mass limits

    Figure_007-b

    10.17182/hepdata.127138.v1/t3

    The W' boson 95% CL limits on the product of cross section and branching fraction. The expected and observed limits...

  • high VLQ mass limits

    Figure_007-c

    10.17182/hepdata.127138.v1/t4

    The W' boson 95% CL limits on the product of cross section and branching fraction. The expected and observed limits...

  • low VLQ mass limits

    Figure_007-a

    10.17182/hepdata.127138.v1/t5

    The W' boson 95% CL limits on the product of cross section and branching fraction. The expected and observed limits...

  • Generalized Expected tB,bT limits

    Figure_008-a

    10.17182/hepdata.127138.v1/t6

    Expected 95% CL limits for generalized hypotheses varying the fraction of tB (F(VLQ=B)) and bT (F(VLQ=T)) from the W′ decay

  • Generalized Expected qH,qZ limits

    Figure_008-b

    10.17182/hepdata.127138.v1/t7

    Expected 95% CL limits for generalized hypotheses varying the VLQ branching fraction to qH and qZ

  • Generalized Observed tB,bT limits

    Figure_008-c

    10.17182/hepdata.127138.v1/t8

    Observed 95% CL limits for generalized hypotheses varying the fraction of tB (F(VLQ=B)) and bT (F(VLQ=T)) from the W′ decay

  • Generalized Observed qH,qZ limits

    Figure_008-d

    10.17182/hepdata.127138.v1/t9

    Observed 95% CL limits for generalized hypotheses varying the VLQ branching fraction to qH and qZ

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