Autoren:	Acharya, Bijaya Bacca, Sonia
Titel:	Gaussian process error modeling for chiral effective-field-theory calculations of np ↔ dγ at low energies
Online-Publikationsdatum:	17-Apr-2023
Erscheinungsdatum:	2022
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	We calculate the energy-dependent cross section of the np ↔ dγ process in chiral effective field theory and apply state-of-the-art tools for quantification of theory uncertainty. We focus on the low-energy regime, where the magnetic dipole and the electric dipole transitions cross over, including the range relevant for big-bang nucleosynthesis. Working with the leading one- and two-body electromagnetic currents, we study the order-by-order convergence of this observable in the chiral expansion of the nuclear potential. We find that the Gaussian process error model describes the observed convergence very well, allowing us to present Bayesian credible intervals for the truncation error with correlations between the cross sections at different energies taken into account. We obtain a 1σ estimate of about 0.2% for the uncertainty from the truncation of the nuclear potential. This is an important step towards calculations with statistically interpretable uncertainties for astrophysical reactions involving light nuclei.
DDC-Sachgruppe:	530 Physik 530 Physics
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 08 Physik, Mathematik u. Informatik Helmholtz Institut Mainz
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-8914
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Weitere Angaben zur Dokumentart:	Scientific article
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/4.0/
Zeitschrift:	Physics letters : B 827
Seitenzahl oder Artikelnummer:	137011
Verlag:	Elsevier
Verlagsort:	Amsterdam
Erscheinungsdatum:	2022
ISSN:	1873-2445
DOI der Originalveröffentlichung:	10.1016/j.physletb.2022.137011
Enthalten in den Sammlungen:	DFG-491381577-D