Limits on a possible composition-dependent force by a Galilean experiment

Abstract

We report the details of an improved Galilean experiment involving simultaneous free fall in vacuum of concentric masses with different compositions. This experiment is sensitive to composition-dependent interactions between the falling masses and the Earth for forces with ranges exceeding 10 km or so that are less accessible to torsion balance experiments. No composition dependence was observed. Limits on baryon, isospin, and lepton couplings are presented for both Yukawa and exponential forms.