Measurement of Muon Capture on the Proton to 1% Precision and Determination of the Pseudoscalar Coupling
Collaboration
5 pages
Published in:
- Phys.Rev.Lett. 110 (2013) 1, 012504
- Published: Jan 3, 2013
e-Print:
- 1210.6545 [nucl-ex]
Citations per year
Abstract: (APS)
The MuCap experiment at the Paul Scherrer Institute has measured the rate ΛS 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. ΛS is determined from the difference between the μ- disappearance rate in hydrogen and the free muon decay rate. The result is based on the analysis of 1.2×1010 μ- decays, from which we extract the capture rate ΛS=(714.9±5.4stat±5.1syst) s-1 and derive the proton’s pseudoscalar coupling gP(q02=-0.88mμ2)=8.06±0.55.Note:
- Updated figure 1 and small changes in wording to match published version
- 13.60.-r
- 24.80.+y
- 14.20.Dh
- 23.40.-s
- muon p: capture
- coupling constant: pseudoscalar
- muon: leptonic decay
- hydrogen: muonic atom
- time projection chamber: hydrogen
- scintillation counter
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