Capture rate and neutron helicity asymmetry for ordinary muon capture on hydrogen

  title={Capture rate and neutron helicity asymmetry for ordinary muon capture on hydrogen},
  author={Shung-ichi Ando and Fred Myhrer and Kuniharu Kubodera},
  journal={Physical Review C},
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 nextto-next-to-leading order. For the singlet hyperfine state, we obtain the capture rate 0 = 695 sec −1 while, for the triplet hyperfine state, we obtain the capture rate 1 = 11.9 sec −1 and the neutron asymmetry α1 = 0.93. If the existing formalism is used to relate these atomic capture rates to liq, the OMC rate in liquid hydrogen… 

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