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Title: Revisiting proton–proton fusion in chiral effective field theory
Abstract We calculate the S -factor for proton–proton fusion using chiral effective field theory interactions and currents. By performing order-by-order calculations with a variety of chiral interactions that are regularized and calibrated in different ways, we assess the uncertainty in the S -factor from the truncation of the effective field theory expansion and from the sensitivity of the S -factor to the short-distance axial current determined from three- and four-nucleon observables. We find that S (0) = (4.100 ± 0.024(syst) ± 0.013(stat) ± 0.008( g A )) × 10 −23 MeV fm 2 , where the three uncertainties arise, respectively, from the truncation of the effective field theory expansion, use of the two-nucleon axial current fit to few-nucleon observables and variation of the axial coupling constant within the recommended range. The increased value of S (0) compared to previous calculations is mainly driven by an increase in the recommended value for the axial coupling constant and is in agreement with a recent analysis based on pionless effective field theory.  more » « less
Award ID(s):
2111426 1555030
NSF-PAR ID:
10436488
Author(s) / Creator(s):
; ;
Date Published:
Journal Name:
Journal of Physics G: Nuclear and Particle Physics
Volume:
50
Issue:
9
ISSN:
0954-3899
Page Range / eLocation ID:
095102
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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