Speaker
Description
We study the D+ -> pi+ eta eta and D+ -> pi+ pi0 eta reactions, which are single Cabibbo suppressed and can proceed both through internal and external emission. The primary mechanisms at quark level are considered, followed by hadronization to produce three mesons in the D+ decay, and after that the final state interaction of these mesons leads to the production of the a0(980) resonance, seen in the pi+ eta , pi0 eta mass distributions. The theory has three unknown parameters to determine the
shape of the distributions and the ratio between the D+ -> pi+ eta eta and D+ -> pi+ pi0 eta rates. This ratio restricts much the sets of parameters but there is still much freedom leading to different shapes in the mass distributions. We call for a measurement of these mass distributions that will settle the reaction mechanism, while at the same time provide relevant information on the way that the a0(980) resonance is produced in the reactions.
