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Title: Gravitational free fall of muonium or positronium
Plain: Muonium (an antimuon with an electron) and positronium (an electron with its antiparticle) contain no protons or neutrons. Measuring how they fall tests gravity on matter made purely of leptons, partly of antimatter.
Precise: Measure the gravitational acceleration of muonium (2.2 microsecond lifetime) or long-lived Rydberg positronium with uncertainty below 10% of g, and determine whether it differs from g.
Settled by: A deflection or interferometric measurement of muonium (LEMING) or Rydberg positronium free fall at 10% or better.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)