Search for heavy resonances decaying into two Higgs bosons in the $\mathrm{b\bar{b}}τ^+τ^-$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-B2G-24-014, 2026.

Abstract
A search is presented for massive narrow-width resonances in the mass range of 1$-$4.5 TeV, decaying into pairs of Higgs bosons (HH). The search uses proton-proton collision data at a center-of-mass energy of 13 TeV collected with the CMS detector at the CERN LHC during 2016$-$2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The analysis targets final states where one Higgs boson decays into a pair of bottom quarks and the other into a pair of tau leptons, X $\to$ HH $\to$$\mathrm{b\bar{b}}τ^+τ^-$. It uses a single large jet to reconstruct the H $\to$$\mathrm{b\bar{b}}$ decay, while the H $\to$$τ^+τ^-$ decay products can either be contained within a single large jet or appear as two isolated tau leptons. The observed data are consistent with standard model background expectations. Upper limits at 95% confidence level are set on the production cross section for resonant HH production for masses between 1 and 4.5 TeV. This analysis sets the most sensitive limits to date on X $\to$ HH $\to$ $\mathrm{b\bar{b}}τ^+τ^-$ decays in the mass range of 1.4 to 4.5 TeV.

  • Figure 2a

    Data from Figure 2 (left)

    10.17182/hepdata.166218.v1/t1

    Distribution of the invariant mass of the di-$\tau$ system, reconstructed with the FastMTT algorithm, after the full event selection in...

  • Figure 2b

    Data from Figure 2 (right)

    10.17182/hepdata.166218.v1/t2

    Distribution of the invariant mass of the di-$\tau$ system, reconstructed with the FastMTT algorithm, after the full event selection in...

  • Figure 3a

    Data from Figure 3 (left)

    10.17182/hepdata.166218.v1/t3

    Distribution of $M_{\mathrm{H}(\mathrm{b}\bar{\mathrm{b}})}$ obtained from the leading AK8 jet in the event after the full event selection for the $\tau_{\mathrm{h}}\tau_{\mathrm{h}}$...

  • Figure 3b

    Data from Figure 3 (right)

    10.17182/hepdata.166218.v1/t4

    Distribution of $M_{\mathrm{H}(\mathrm{b}\bar{\mathrm{b}})}$ obtained from the leading AK8 jet in the event after the full event selection for the $\ell\tau_{\mathrm{h}}$...

  • Figure 4a

    Data from Figure 4 (left)

    10.17182/hepdata.166218.v1/t5

    Post-fit reconstructed mass distribution of resonance $X$ in the SR after applying all selection criteria, for the sum of the...

  • Figure 4b

    Data from Figure 4 (right)

    10.17182/hepdata.166218.v1/t6

    Post-fit reconstructed mass distribution of resonance $X$ in the SB after applying all selection criteria, for the sum of the...

  • Figure 5a

    Data from Figure 5 (left)

    10.17182/hepdata.166218.v1/t7

    Expected and observed upper limits at 95% CL on the production cross section of resonant HH production for a spin-0...

  • Figure 5b

    Data from Figure 5 (right)

    10.17182/hepdata.166218.v1/t8

    Expected and observed upper limits at 95% CL on the production cross section of resonant HH production for a spin-2...

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