A J^PG=1++ Charged Resonance in the Y(4260) to pi+pi- J/psi Decay?

TL;DR

This paper analyzes recent experimental data on the Y(4260) decay, proposing that observed peaks could indicate a charged tetraquark resonance around 3880 MeV, contrasting with molecular state predictions.

Contribution

It suggests the presence of a charged tetraquark resonance in Y(4260) decay data and compares tetraquark and molecular models for explaining the observed peaks.

Findings

Potential charged resonance at ~3880 MeV consistent with tetraquark model.

Another possible peak ~100 MeV below the observed one.

Molecular model predicts a D* D*bar state at ~4020 MeV.

Abstract

New BES and Belle data show a peak in the Y(4260) decay into J/psi plus one charged pion. We point out that the peak might correspond to a charged resonance at about 3880 MeV predicted time ago within a tetraquark model. The same tetraquark model predicts another peak at about 100 MeV below the observed one. We discuss the possibility of having it in present data. On the other hand we expect that if the molecular picture were the correct one, a peak corresponding to a D* D*bar state should appear at about 4020 MeV.