title: Chiral effective field theory predictions for muon capture on deuteron and {3}He.
abstract: The muon-capture reactions {2}H(μ{-},ν{μ})nn and {3}He(μ{-},ν{μ}){3}H are studied with nuclear potentials and charge-changing weak currents, derived in chiral effective field theory. The low-energy constants (LECs) c{D} and c{E}, present in the three-nucleon potential and (c{D}) axial-vector current, are constrained to reproduce the A=3 binding energies and the triton Gamow-Teller matrix element. The muon-capture rates on deuteron and {3}He are predicted to be 399±3  sec{-1} and 1494±21  sec{-1}, respectively. The spread accounts for the cutoff sensitivity, as well as uncertainties in the LECs and electroweak radiative corrections. By comparing the calculated and precisely measured rates on {3}He, a value for the induced pseudoscalar form factor is obtained in good agreement with the chiral perturbation theory prediction.
authors.affiliation: Department of Physics, University of Pisa, 56127 Pisa, Italy and INFN-Pisa, 56127 Pisa, Italy.
authors.forename: L E
authors.initials: LE
authors.lastname: Marcucci
authors.forename: A
authors.initials: A
authors.lastname: Kievsky
authors.forename: S
authors.initials: S
authors.lastname: Rosati
authors.forename: R
authors.initials: R
authors.lastname: Schiavilla
authors.forename: M
authors.initials: M
authors.lastname: Viviani