Abstract
The MuCap experiment at the Paul Scherrer Institute has measured the rate of muon capture from the singlet state of the muonic hydrogen atom to a precision of 1%. A muon beam was stopped in a time projection chamber filled with 10-bar, ultrapure hydrogen gas. Cylindrical wire chambers and a segmented scintillator barrel detected electrons from muon decay. is determined from the difference between the disappearance rate in hydrogen and the free muon decay rate. The result is based on the analysis of decays, from which we extract the capture rate and derive the proton’s pseudoscalar coupling .
- Received 25 October 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.012504
© 2013 American Physical Society
Synopsis
Sizing Up Quark Interactions
Published 3 January 2013
Muon capture experiments provide a rare opportunity to measure the effects of quark interactions in the proton.
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