Title

Measurement of muon capture on the proton to 1% precision and determination of the pseudoscalar coupling gP

Authors

V. A. Andreev, Petersburg Nuclear Physics Institute (PNPI)
T. I. Banks, University of California, Berkeley
R. M. Carey, Boston University
T. A. Case, University of California, Berkeley
S. M. Clayton, University of Illinois Urbana-Champaign
K. M. Crowe, University of California, Berkeley
J. Deutsch, Université Catholique de Louvain
J. Egger, Paul Scherrer Institut
S. J. Freedman, University of California, Berkeley
V. A. Ganzha, Petersburg Nuclear Physics Institute (PNPI)
T. Gorringe, University of Kentucky
F. E. Gray, University of California, Berkeley
D. W. Hertzog, University of Illinois Urbana-Champaign
M. Hildebrandt, Paul Scherrer Institut
P. Kammel, University of Illinois Urbana-Champaign
B. Kiburg, University of Illinois Urbana-Champaign
S. Knaack, University of Illinois Urbana-Champaign
P. A. Kravtsov, Petersburg Nuclear Physics Institute (PNPI)
A. G. Krivshich, Petersburg Nuclear Physics Institute (PNPI)
B. Lauss, Paul Scherrer Institut
K. R. Lynch, Boston University
E. M. Maev, Petersburg Nuclear Physics Institute (PNPI)
O. E. Maev, Petersburg Nuclear Physics Institute (PNPI)
F. Mulhauser, University of Illinois Urbana-Champaign
C. Petitjean, Paul Scherrer Institut
G. E. Petrov, Petersburg Nuclear Physics Institute (PNPI)
R. Prieels, Université Catholique de Louvain
G. N. Schapkin, Petersburg Nuclear Physics Institute (PNPI)
G. G. Semenchuk, Petersburg Nuclear Physics Institute (PNPI)
M. A. Soroka, Petersburg Nuclear Physics Institute (PNPI)
V. Tishchenko, University of Kentucky
A. A. Vasilyev, Petersburg Nuclear Physics Institute (PNPI)
A. A. Vorobyov, Petersburg Nuclear Physics Institute (PNPI)
M. E. Vznuzdaev, Petersburg Nuclear Physics Institute (PNPI)

Document Type

Article

Publication Date

1-3-2013

Abstract

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. © 2013 American Physical Society.

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