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We have studied the 7Be(p,photon)8B reaction in the Halo effective fieldtheory (EFT) framework. The leading order (LO) results were published inPhys.Rev.C89,051602(2014) after the isospin mirror process, 7Li(n,photon)8Li,was addressed in Phys.Rev.C89,024613(2014). In both calculations, one key stepwas using the final shallow bound state asymptotic normalization coefficients(ANCs) computed by ab initio methods to fix the EFT couplings. Recently we havedeveloped the next-to-LO (NLO) formalism (to appear soon), which couldreproduce other model results by no worse than 1% when the 7Be-p energy wasbetween 0 and 0.5 MeV. In our recent report (arXiv:1507.07239), a differentapproach from that in Phys.Rev.C89,051602(2014) was used. We applied Bayesiananalysis to constrain all the NLO-EFT parameters based on measured S-factors,and found tight constraints on the S-factor at solar energies. Our S(E=0 MeV)=21.3 + - 0.7 eV b. The uncertainty is half of that previously recommended. Inthis proceeding, we provide extra details of the Bayesian analysis, includingthe computed EFT parameters' probability distribution functions (PDFs) and howthe choice of input data impacts final results.

How well do we understand Beryllium-7 + proton -> Boron-8 + photon? An Effective Field Theory perspective