https://doi.org/10.1140/epja/s10050-020-00166-0
Regular Article - Theoretical Physics
Proton–proton fusion in new pionless EFT power counting
Department of Physics, University of Tehran, P.O.Box 14395-547, Tehran, Iran
* e-mail: bayegan@ut.ac.ir
Received:
16
January
2020
Accepted:
15
May
2020
Published online:
3
June
2020
The zero-energy astrophysical S-factor for the fusion process 
is calculated using pionless effective field theory (
EFT). In the present study, the order-by-order results are reproduced according to a new suggested power counting. The short range interactions in the S-wave pp scattering at leading order and the corrections in the next-to-leading order including the Coulomb interaction are introduced. In addition the Coulomb interaction between the incoming protons has been considered. The new nuclear EFT amplitude is compatible with renormalization-group invariance.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
