Comment on "Study of D(sJ) decays to D(*)K in inclusive e(+)e(-) interactions"

TL;DR

This paper challenges previous conclusions about the D(sJ)(*)(2860) decay, proposing that data supports two overlapping resonances, a tensor 2(+) and a scalar 0(+), based on branching ratios and spectral comparisons.

Contribution

The authors argue for the existence of two overlapping resonances at 2.86 GeV, revising the interpretation of decay data and challenging prior exclusion of the 0(+) state.

Findings

Data supports two overlapping resonances at 2.86 GeV.

Branching ratio favors a scalar 0(+) state.

Comparison with charmonium states justifies the scenario.

Abstract

We comment on the recent observation of the decay mode D(sJ)(*)(2860)-->D(*)K by the BABAR Collaboration [arXiv:0908.0806], and contest their peremptory conclusion that the data exclude a 0(+) assignment for the D(sJ)(*)(2860). In particular, we argue that the observed branching fraction B(D(sJ)(*)(2860)-->D(*)K)/B(D(sJ)(*)(2860)-->DK)=1.1 pm 0.15 pm 0.19 supports the existence of two largely overlapping resonances at about 2.86 GeV, namely a pair of radially excited tensor 2(+) and scalar 0(+) c-sbar states. This scenario is further justified by comparing with the corresponding excited charmonium states. Also other aspects of the charm-strange spectrum are discussed.