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Search for decays of the Higgs boson into a pair of pseudoscalar particles decaying into $b\bar{b}\tau^+\tau^-$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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abstract
This paper presents a search for exotic decays of the Higgs boson into a pair of new pseudoscalar particles, $H\rightarrow aa$, where one pseudoscalar decays into a $b$-quark pair and the other decays into a $\tau$-lepton pair, in the mass range $12\leq m_{a}\leq 60$ GeV. The analysis uses $pp$ collision data at $\sqrt{s} = 13$ TeV collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 ${fb}^{-1}$. No significant excess above the Standard Model (SM) prediction is observed. Assuming the SM Higgs boson production cross-section, the search sets upper limits at 95% confidence level on the branching ratio of Higgs bosons decaying into $b\bar{b}\tau^+\tau^-$, $\mathcal{B}(H \rightarrow aa \rightarrow b\bar{b}\tau^+\tau^-)$, between 2.2% and 3.9% depending on the pseudoscalar mass.
Forward citations
Cited by 3 Pith papers
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Search for Lorentz-boosted di-$\tau$ resonances produced in association with top quark pairs in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
No excess is seen; ATLAS sets a 0.19 fb model-independent visible cross-section limit and 2HDM σ×BR limits of 0.4–0.05 pb for ma = 20–85 GeV using boosted di-τ reconstruction.
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Search for decays of the Higgs boson into scalar particles decaying into four or six $b$-quarks using $pp$ collisions at $\sqrt{s}= 13\,\mathrm{TeV}$ with the ATLAS detector
With 140 inverse femtobarns of 13 TeV LHC data, ATLAS finds no excess of Higgs decays to new scalars producing four or six bottom quarks, and sets 95% CL upper limits from 4% to 38% on the branching fractions.
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Axions and Axion-like particles: collider searches
A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.
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