Abstract:By measuring the lifetime of the negative muon in pure protium ( 1 H), the MuCap experiment determines the rate of muon capture on the proton, from which the proton's pseudoscalar coupling gp may be inferred. A precision of 15% for gp has been published; this is a step along the way to a goal of 7%. This coupling can be calculated precisely from heavy baryon chiral perturbation theory and therefore permits a test of QCD's chiral symmetry. Meanwhile, the MuSun experiment is in its final design stage; it will me… Show more
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