Fixing Two-Nucleon Weak-Axial Coupling L₁,ₐ From mu-d Capture

الأصل · EN

We calculate the muon capture rate on the deuteron to next-to-next-to-leading order in the pionless effective field theory. The result can be used to constrain the two-nucleon isovector axial coupling L₁,ₐ to +/- 2 fm³ if the muon capture rate is measured to 2% level. From this, one can determine the neutrino-deuteron break up reactions and the pp-fusion cross section in the sun to a same level of accuracy.