a0(980) physics in semileptonic D0 and D+ decays

摘要

The decays D 0 → d u ˉ e + ν → a 0 ? ( 980 ) e + ν → π ? η e + ν and D + → d d ˉ e + ν → a 0 0 ( 980 ) e + ν → π 0 η e + ν (and the charge conjugated ones) are the direct probe of the constituent two-quark components in the a 0 ± ( 980 ) and a 0 0 ( 980 ) wave functions. The recent BESIII experiment is the first step in the experimental study of these decays. We suggest adequate formulas for the data analysis and present a variant of η π invariant mass distribution when a 0 ( 980 ) has no constituent two-quark component at all.