Chiral EFT plus hyperspherical harmonics yields S(0)=(8.7±0.9)×10^{-20} keV b for hep, validated by reproducing the hen cross section from thermal to few MeV energies.
By definition, the per- mutation p = 1 is chosen to correspond to the order 1, 2, 3 and 4
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A new analysis of the "hep" S-factor and the "hen" cross section
Chiral EFT plus hyperspherical harmonics yields S(0)=(8.7±0.9)×10^{-20} keV b for hep, validated by reproducing the hen cross section from thermal to few MeV energies.