Triangle singularities in the Tcc+ → D*+D0 → π+ D0D0 decay width

The values of the masses of the particles involved in the decay of T-cc(+) -> D*D-+(0) -> pi(+) D(0)D(0)suggest that due to the final state interactions in the transition vertex T-cc(+) -> D*D-+(0) there may be triangle logarithmic singularities. We discuss their possible role and show that the tree approximation for calculating the decay widths T-cc(+) -> (D*D-+(0) + D*(0) D+) -> pi(+DD0)-D-0, pi(DD+)-D-0-D-0, gamma(DD+)-D-0 is quite sufficient at the current level of measurement accuracy.

Automated summary

This study examines the mass values of particles involved in the decay of T-cc(+) and the possible presence of triangle logarithmic singularities due to final state interactions in the transition vertex. The research demonstrates that using the tree approximation to calculate the decay widths is sufficient at the current level of measurement accuracy.