Search for a vector-like quark T$'$$\to$ tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-B2G-21-007, 2023.

Abstract
A search for the electroweak production of a vector-like quark T$'$, decaying to a top quark and a Higgs boson is presented. The search is based on a sample of proton-proton collision events recorded at the LHC at $\sqrt{s}$ = 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. This is the first T$'$ search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet T$'$ states with masses up to 1.1 TeV, the excellent diphoton invariant mass resolution of 1-2% results in an increased sensitivity compared to previous searches based on the same production mechanism. The electroweak production of a T$'$ quark with mass up to 960 GeV is excluded at 95% confidence level, assuming a coupling strength $\kappa_\mathrm{T}$ = 0.25 and a relative decay width $\Gamma/M_{\mathrm{T}'} \lt$ 5%.

  • Figure 4

    Figure 4

    10.17182/hepdata.134009.v1/t1

    The combined, leptonic plus hadronic, expected (dotted black) and observed (solid black) upper limits at 95% CL on $\sigma_{T^\prime bq}...

  • Figure 5

    Figure 5

    10.17182/hepdata.134009.v1/t2

    The combined, leptonic plus hadronic, expected (dotted black) and observed (solid black) upper limits at 95% CL on the $T^\prime$...

  • Figure 6

    Figure 6, Auxiliary material

    10.17182/hepdata.134009.v1/t3

    The expected (dotted black) and observed (solid black) upper limits at 95% CL on $\sigma_{T^\prime bq(T^\prime \rightarrow tH)}$ in the...

  • Figure 7

    Figure 7, Auxiliary material

    10.17182/hepdata.134009.v1/t4

    The expected (dotted black) and observed (solid black) upper limits at 95% CL on $\sigma_{T^\prime bq(T^\prime \rightarrow tH)}$ in the...

  • Table 1 Hadronic channel

    Table 1

    10.17182/hepdata.134009.v1/t5

    Selection of the hadronic signal region for the three BDTs and $\rm{M}_{T^\prime}$ windows.

  • Table 1 Leptonic channel

    Table 1

    10.17182/hepdata.134009.v1/t6

    Selection of the leptonic signal region for the three BDTs and $\rm{M}_{T^\prime}$ windows.

  • Table 2

    Table 2

    10.17182/hepdata.134009.v1/t7

    The expected yields of different processes in each signal window for events with a $T^{\prime}$ with mass in the range...

  • Table 3

    Table 3, Auxiliary material

    10.17182/hepdata.134009.v1/t8

    Signal efficiency for the hadronic channel (left) and the leptonic channel (right) in the signal regions as optimized for each...

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