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Measurement of the Formation Rate of Muonic Hydrogen Molecules | | MuCap Collaboration
; V. A. Andreev
; T. I. Banks
; R. M. Carey
; T. A. Case
; S. M. Clayton
; K. M. Crowe
; J. Deutsch
; J. Egger
; S. J. Freedman
; V. A. Ganzha
; T. Gorringe
; F. E. Gray
; D. W. Hertzog
; M. Hildebrandt
; P. Kammel
; B. Kiburg
; S. Knaack
; P. A. Kravtsov
; A. G. Krivshich
; B. Lauss
; K. R. Lynch
; E. M. Maev
; O. E. Maev
; F. Mulhauser
; C. Petitjean
; G. E. Petrov
; R. Prieels
; G. N. Schapkin
; G. G. Semenchuk
; M. A. Soroka
; V. Tishchenko
; A. A. Vasilyev
; A. A. Vorobyov
; M. E. Vznuzdaev
; P. Winter
; | | Date: |
3 Feb 2015 | | Abstract: | Background: The rate lambda_ppmu characterizes the formation of ppmu
molecules in collisions of muonic pmu atoms with hydrogen. In measurements of
the basic weak muon capture reaction on the proton to determine the
pseudoscalar coupling g_P, capture occurs from both atomic and molecular
states. Thus knowledge of lambda_ppmu is required for a correct
interpretation of these experiments.
Purpose: Recently the MuCap experiment has measured the capture rate
Lambda_S from the singlet pmu atom, employing a low density active target to
suppress ppmu formation (PRL 110, 12504 (2013)). Nevertheless, given the
unprecedented precision of this experiment, the existing experimental knowledge
in lambda_ppmu had to be improved.
Method: The MuCap experiment derived the weak capture rate from the muon
disappearance rate in ultra-pure hydrogen. By doping the hydrogen with 20 ppm
of argon, a competing process to ppmu formation was introduced, which allowed
the extraction of lambda_ppmu from the observed time distribution of decay
electrons.
Results: The ppmu formation rate was measured as lambda_ppmu = (2.01 +-
0.06(stat) +- 0.03(sys)) 10^6 s^-1. This result updates the lambda_ppmu
value used in the above mentioned MuCap publication.
Conclusions: The 2.5x higher precision compared to earlier experiments and
the fact that the measurement was performed at nearly identical conditions to
the main data taking, reduces the uncertainty induced by lambda_ppmu to a
minor contribution to the overall uncertainty of Lambda_S and g_P, as
determined in MuCap. Our final value for lambda_ppmu shifts Lambda_S and
g_P by less than one tenth of their respective uncertainties compared to our
results published earlier. | | Source: | arXiv, 1502.0913 | | Services: | Forum | Review | PDF | Favorites | |
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