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

Abstract

This paper reports a search for a light CP-odd scalar resonance with a mass of 20 GeV to 90 GeV in 13 TeV proton-proton collision data with an integrated luminosity of 140 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 into a ${\tau }^{+}{\tau }^{-}$ pair which subsequently 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 at 95 confidence level between 3.0 pb and 68 pb are set on the cross-section for producing a CP-odd Higgs boson that decays into a ${\tau }^{+}{\tau }^{-}$ pair.

arXiv comment52 pages in total, author list starting page 35, 8 figures, 5 tables, published by JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2021-08/

References in corpus (70)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Theory and phenomenology of two-Higgs-doublet models
• Parton distributions for the LHC Run II
• Herwig++ Physics and Manual
• Parton distributions with LHC data
• PDF4LHC recommendations for LHC Run II
• New parton distribution functions from a global analysis of quantum chromodynamics
• Parton distributions in the LHC era: MMHT 2014 PDFs
• HDECAY: a Program for Higgs Boson Decays in the Standard Model and its Supersymmetric Extension
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• The Anatomy of Electro-Weak Symmetry Breaking. II: The Higgs bosons in the Minimal Supersymmetric Model
• The anomalous magnetic moment of the muon in the Standard Model
• Herwig 7.0 / Herwig++ 3.0 Release Note
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Next-to-Next-to-Leading Order Higgs Production at Hadron Colliders
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• QCD Matrix Elements + Parton Showers
• Event Generation with Sherpa 2.2
• QCD matrix elements + parton showers: The NLO case
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• QCD matrix elements and truncated showers
• Higgs boson gluon-fusion production in N3LO QCD
• A critical appraisal of NLO+PS matching methods
• The CT10 NNLO Global Analysis of QCD
• Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections
• NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders
• NNLO QCD corrections to the Higgs-strahlung processes at hadron colliders
• Electroweak and QCD corrections to Higgs production via vector-boson fusion at the LHC
• Yukawa Alignment in the Two-Higgs-Doublet Model
• Strong and electroweak corrections to the production of Higgs+2jets via weak interactions at the LHC
• QCD Effects in Higgs Physics
• Electroweak Radiative Corrections to Associated WH and ZH Production at Hadron Colliders
• Higgs production via vector-boson fusion at NNLO in QCD
• NNLOPS simulation of Higgs boson production
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Higgs production in gluon fusion at next-to-next-to-leading order QCD for finite top mass
• Radiative corrections to the semileptonic and hadronic Higgs-boson decays H -> W W/Z Z -> 4 fermions
• NNLO Computational Techniques: the Cases H -> gamma gamma and H -> g g
• Higgs Boson Production at Hadron Colliders at N3LO in QCD
• New physics explanations of $a_{\mu }$ in light of the FNAL muon $g-2$ measurement
• vh@nnlo - Higgs Strahlung at hadron colliders
• Finite top quark mass effects in NNLO Higgs boson production at LHC
• Top-Quark Mediated Effects in Hadronic Higgs-Strahlung
• Finite top mass effects for hadronic Higgs production at next-to-next-to-leading order
• Top-pair production at the LHC through NNLO QCD and NLO EW
• Top mass effects in Higgs production at next-to-next-to-leading order QCD: virtual corrections
• Gluon-induced Higgs-strahlung at next-to-leading order QCD
• A New Mass Reconstruction Technique for Resonances Decaying to di-tau
• HAWK 2.0: A Monte Carlo program for Higgs production in vector-boson fusion and Higgs strahlung at hadron colliders
• Higgs production in gluon fusion beyond NNLO
• Soft gluon resummation for gluon-induced Higgs Strahlung
• New Barr-Zee contributions to $(\mathbf{g}-2{)}_{\mu }$ in two-Higgs-doublet models
• Muon Anomalous Magnetic Moment, Two-Higgs-Doublet Model, and Supersymmetry
• iHixs 2 - Inclusive Higgs Cross Sections
• Higher order corrections to mixed QCD-EW contributions to Higgs production in gluon fusion
• Precision calculations for the Higgs decays H-->ZZ/WW-->4leptons
• On the Higgs cross section at N${}^3$LO+N${}^3$LL and its uncertainty
• Muon g-2 in the 2HDM: maximum results and detailed phenomenology
• Updated Higgs cross section at approximate N${}^3$LO
• Double resummation for Higgs production
• Pseudo-scalar Higgs boson production at N${}^3$LO${}_{\text{A}}$+N${}^3$LL${}^{\prime }$
• Muon anomalous magnetic moment in the standard model with two Higgs doublets
• An approximate NNNLO cross section for Higgs production in gluon fusion