Abstract
Contributions of three-nucleon forces (3NF) to proton-deuteron scattering observables at energies below the deuteron breakup threshold are studied by solving the Faddeev equation that includes the Coulomb interaction. At ${E}_{p}=3.0\mathrm{MeV},$ we find that the central part of a two-pion exchange 3NF removes the discrepancy between measured cross sections and the calculated ones by two-nucleon forces, and improves the agreement with ${T}_{22}$ experimental data. However, the tensor part of the 3NF fails in reproducing data of the analyzing power ${T}_{21}$ by giving worse agreement between the measured and the calculated. Detailed examinations of scattering amplitudes suggest that a P-wave contribution in spin-quartet tensor amplitudes has unsuitable sign for reproducing the ${T}_{21}$ data.
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