Dark matter searches and particle astrophysics — Hidden photon cold dark matter near 3 eV

A submillimetre magnet levitated in a superconducting trap would detect the oscillating force from ultralight dark matter coupled to baryon-minus-lepton number.

With a force sensitivity of 0.2 fN/√Hz, the search found no evidence of a signal in the mass range 1.10360–1.10485 × 10⁻¹³ eV/c², giving a most stringent coupling limit of g(B−L) ≲ 2.98 × 10⁻²¹.

Why it matched: similar wording

A light dark photon from an extra U(1) symmetry, with mass between roughly 0.5 and 1 GeV, would show up as a resonance in e+e- to U-gamma events with U decaying to two pions.

Searching 28 million e+e- to pi+pi-gamma events from KLOE at DAFNE found no signal; the result is a 90% CL upper limit on the photon-dark photon mixing strength for masses of 527-987 MeV, tighter than earlier limits above 700 MeV.

Why it matched: similar wording