No signal found in first search for eta to pi0 plus invisible dark scalar decay, setting branching fraction limits of (1.8-5.5)x10^-5 at 90% CL and improving DM-nucleon cross section bounds by ~5 orders of magnitude.
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Neutron stars yield tighter bounds on muonic scalar and vector fifth forces (g_φμ ≲ 10^{-12}, g_Vμ ≲ 3×10^{-13} for m_X ≲ 100 keV) than SN 1987A, plus hydrostatic constraints for long-range cases.
A proposed LHC search using low-multiplicity jets plus a photon can extend sensitivity to GeV-scale particles that couple to light quarks.
REDTOP targets O(10^14) eta and O(10^12) eta-prime decays to probe four hidden sector portals and test CP/T invariance plus lepton universality.
citing papers explorer
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Search for sub-GeV dark particles in $\eta\to\pi^0+\rm{invisible}$ decay
No signal found in first search for eta to pi0 plus invisible dark scalar decay, setting branching fraction limits of (1.8-5.5)x10^-5 at 90% CL and improving DM-nucleon cross section bounds by ~5 orders of magnitude.
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Neutron Star Bounds on Muonic Fifth Forces from Picometer to Kilometer Scales
Neutron stars yield tighter bounds on muonic scalar and vector fifth forces (g_φμ ≲ 10^{-12}, g_Vμ ≲ 3×10^{-13} for m_X ≲ 100 keV) than SN 1987A, plus hydrostatic constraints for long-range cases.
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Low-Multiplicity Jets as Probes of GeV-Scale Light-Quark-Coupled Particles
A proposed LHC search using low-multiplicity jets plus a photon can extend sensitivity to GeV-scale particles that couple to light quarks.
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Hidden-sectors search and probe of discrete symmetries at the REDTOP experiment
REDTOP targets O(10^14) eta and O(10^12) eta-prime decays to probe four hidden sector portals and test CP/T invariance plus lepton universality.