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Stringent limits on the \pi^0 -> \gamma X, X -> e+e- decay from neutrino experiments and constraints on new light gauge bosons

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arxiv 1112.5438 v3 pith:LRHWNF7E submitted 2011-12-22 hep-ph hep-ex

S. N. Gninenko This is my paper · ORCID
classification hep-phhep-ex
keywords neutrinolimitsdecaygammabosonboundsdecaysexperimental
verification ladder T0 review T1 audit T2 compute T3 formal
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We report new experimental limits on the \pi^0 -> \gamma X decay of the neutral pion into a photon and a light boson X followed by the decay X -> e+e-. If this process exist, one would expect a flux of high energy X's produced from \pi^0's generated by the proton beam in a neutrino target. The X's would then penetrate the downstream shielding and be observed in a neutrino detector via their decays. Using bounds from the NOMAD and PS191 neutrino experiments at CERN that searched for an excess of e+e- pairs from heavy neutrino decays, stringent limits on the branching ratio as small as Br(\pi^0 -> \gamma X) < 10^{-15} are obtained. These limits are several orders of magnitude smaller than the previous experimental and cosmological bounds. The obtained results are used to constrain models, where the X interacts with quarks and leptons, or it is a new vector boson mixing with photons, that transmits interaction between our world and hidden sectors consisting of SU(3)_C x SU(2)_L x U(1)_Y singlet fields.

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Cited by 5 Pith papers

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  3. Testing light and heavy vector mediators with solar CE$\nu$NS measurements

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    Combined solar CEνNS data from XENONnT, PandaX-4T, and LZ yield competitive constraints on vector NSI and light mediators and a weak mixing angle measurement at low momentum transfer.

  4. Clarity through the Neutrino Fog: Constraining New Forces in Dark Matter Detectors

    hep-ph 2024-11 conditional novelty 5.0 of 10

    The first solar CEνNS data from PandaX-4T and XENONnT give world-leading laboratory constraints on light scalar and vector mediators for masses below about 50 MeV.

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    Monte Carlo studies show BESIII data already reaches previously unexplored regions of the dark axion portal via J/ψ → a γ' decays, with STCF projected to improve sensitivity by about an order of magnitude.

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