science ⚛️ Spooky action confirmed in Higgs decay ⚛️
ATLAS physicists found strong evidence that Z boson pairs from Higgs decays exhibit entangled spin states. This research was conducted by the ATLAS Collaboration at CERN using proton collisions from LHC Runs 2 and 3. The strongest analysis rejected a nonentangled state at 4.7 sigma, building on prior top quark entanglement studies. This result shows quantum coherence in massive, short-lived particles at electroweak energies. The findings open new avenues to rigorously test the established Standard Model of particle physics.