Michele Viviani

Parameter-free effective field theory calculation for the solar proton-fusion and hep processes

Spurred by the recent complete determination of the weak currents in two-nucleon systems up to

Three-nucleon bound states using realistic potential models

\mathcal{O}{(Q}^{3})

Electromagnetic Currents and Magnetic Moments in

in heavy-baryon chiral perturbation theory, we carry out a parameter-free calculation of the threshold S factors for the solar

\chi

\mathrm{pp}

EFT

(proton-fusion) and hep processes in an effective field theory (EFT) that combines the merits of the standard nuclear physics method and systematic chiral expansion. The power of the EFT adopted here is that one can correlate in a unified formalism the weak-current matrix elements of two-, three-, and four-nucleon systems. Using the tritium

Benchmark calculation for proton-deuteron elastic scattering observables including the Coulomb interaction

\ensuremath{\beta}

Low energy n-{sup 3}H scattering: A novel testground for nuclear interactions

-decay rate as an input to fix the only unknown parameter in the theory, we can evaluate the threshold S factors with drastically improved precision; the results are

Quantitative studies of the homogeneous Bethe-Salpeter equation in Minkowski space

{S}_{\mathrm{pp}}(0)=3.94\ifmmode\times\else\texttimes\fi{}(1\ifmmode\pm\else\textpm\fi{}0.004)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}25}\mathrm{MeV}\mathrm{}\mathrm{b}

Variational calculation on A=3 and 4 nuclei with non-local potentials

and

Proton-Proton Weak Capture in Chiral Effective Field Theory

{S}_{\mathrm{hep}}(0)=(8.6\ifmmode\pm\else\textpm\fi{}1.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}20}\mathrm{keV}\mathrm{}\mathrm{b}.