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Collider constraints on light pseudoscalars

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arxiv 1802.02156 v3 pith:6RV2XONP submitted 2018-02-06 hep-ph hep-ex

classification hep-phhep-ex
keywords lightcolliderpseudoscalarssearchesstatesallowsariseattention
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We investigate the bounds on light pseudoscalars that arise from a variety of collider searches. Special attention is thereby devoted to the mass regions $[3, 5] \, {\rm GeV}$ and $[9,11] \, {\rm GeV}$, in which a meaningful theoretical description has to include estimates of non-perturbative effects such as the mixing of the pseudoscalar with QCD bound states. A compendium of formulas that allows to deal with the relevant corrections is provided. It should prove useful for the interpretation of future LHC searches for light CP-odd spin-0 states.

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  1. 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

    hep-ex 2025-07 conditional novelty 6.0 of 10

    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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