Search for a light CP-odd Higgs boson decaying into a pair of $\tau$-leptons in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
CERN-EP-2024-235, 2024.

Abstract (data abstract)
This paper reports a search for a light CP-odd resonance with a mass of $20\,\mathrm{GeV}$ to $90\,\mathrm{GeV}$ in $13\,\mathrm{TeV}$ proton-proton collision data with an integrated luminosity of $140\,\mathrm{fb}^{-1}$ collected with the ATLAS detector at the Large Hadron Collider. The analysis assumes the resonance is produced via gluon-gluon fusion and decays exclusively into a $\tau^{+}\tau^{-}$ pair which decays into a fully leptonic $\mu^{+}\nu_{\mu} \bar{\nu}_{\tau} e^{-} \bar{\nu}_{e} \nu_{\tau}$ or $e^{+}\nu_{e}\bar{\nu}_{\tau} \mu^-\bar{\nu}_{\mu}\nu_{\tau}$ final state. No significant excess of events above the predicted Standard Model background is observed. The results are interpreted within a flavour-aligned two-Higgs-doublet model, and a model-independent cross-section interpretation is also given. Upper limits between $3.0\,\mathrm{pb}$ and $67.5\,\mathrm{pb}$ at $95\%$ confidence level are set on the cross-section for producing a CP-odd Higgs boson that decays into a $\tau^+\tau^-$ pair.

  • $m_\mathrm{MMC}$ distribution in low-mass SR ($m_A$ = 20 GeV)

    Data from Figure 6a

    10.17182/hepdata.153948.v1/t1

    Post-fit $m_\mathrm{MMC}$ distribution in the low-mass SR for the $m_A = 20\,\mathrm{GeV}$ signal mass hypothesis. $m_\mathrm{MMC}$ is the mass reconstructed...

  • $m_\mathrm{MMC}$ distribution in high-mass SR ($m_A$ = 90 GeV)

    Data from Figure 6b

    10.17182/hepdata.153948.v1/t2

    Post-fit $m_\mathrm{MMC}$ distribution in the high-mass SR for the $m_A = 90\,\mathrm{GeV}$ signal mass hypothesis. $m_\mathrm{MMC}$ is the mass reconstructed...

  • Upper limits on $gg \rightarrow A \rightarrow \tau\tau$

    Data from Figure 7

    10.17182/hepdata.153948.v1/t3

    Expected and observed $95\%$ CL limits on the production cross-section for $gg\rightarrow A$ times the branching ratio for $A$ decaying...

  • Upper limits on the up-type quark coupling parameter

    Data from Figure 8

    10.17182/hepdata.153948.v1/t4

    Expected and observed $95\%$ CL limits on the absolute value of the up-type quark coupling parameter $|\zeta_\mathrm{u}|$ for masses of...

  • $p_0$ value, fit of $gg \rightarrow A \rightarrow \tau\tau$

    Data from Aux. Figure 14a

    10.17182/hepdata.153948.v1/t5

    Observed $p_0$ values for the fits on the production cross-section for $gg\rightarrow A$ times the branching ratio for $A$ decaying...

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