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- W2080356918 abstract "Applying heavy-baryon chiral perturbation theory to ordinary muon capture (OMC) on a proton, we calculate the capture rate and neutron helicity asymmetry up to next-to-next-to-leading order. For the singlet hyperfine state, we obtain the capture rate ${ensuremath{Gamma}}_{0}=695$ ${mathrm{s}}^{ensuremath{-}1}$ while, for the triplet hyperfine state, we obtain the capture rate ${ensuremath{Gamma}}_{1}=11.9$ ${mathrm{s}}^{ensuremath{-}1}$ and the neutron asymmetry ${ensuremath{alpha}}_{1}=0.93.$ If the existing formalism is used to relate these atomic capture rates to ${ensuremath{Gamma}}_{mathrm{liq}},$ the OMC rate in liquid hydrogen, then ${ensuremath{Gamma}}_{mathrm{liq}}$ corresponding to our improved values of ${ensuremath{Gamma}}_{0}$ and ${ensuremath{Gamma}}_{1}$ is found to be significantly larger than the experimental value, primarily due to the updated larger value of ${g}_{A}.$ We argue that this apparent difficulty may be correlated to the specious anomaly recently reported for ${ensuremath{mu}}^{ensuremath{-}}+stackrel{ensuremath{rightarrow}}{p}n+{ensuremath{nu}}_{ensuremath{mu}}+ensuremath{gamma},$ and we suggest a possibility to remove these two ``problems'' simply and simultaneously by reexamining the molecular physics input that underlies the conventional analysis of ${ensuremath{Gamma}}_{mathbf{liq}}.$" @default.
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- W2080356918 date "2000-12-20" @default.
- W2080356918 modified "2023-09-27" @default.
- W2080356918 title "Capture rate and neutron helicity asymmetry for ordinary muon capture on hydrogen" @default.
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- W2080356918 doi "https://doi.org/10.1103/physrevc.63.015203" @default.
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