2013/10/31 by Martin Cleven, Qian Wang, Feng-Kun Guo +3 · 1 citation
Physics and Astronomy · #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.90.074039
Analysis of the angular distribution is included which can be compared with the experimental data
arxiv created 2014/06/15 · arxiv updated 2015/06/17
Since its first observation in 2005, the vector charmonium Y(4260) has turned out to be one of the prime candidates for an exotic state in the charmonium spectrum. It was recently proposed that the Y(4260) should have a prominent D1D+c.c. molecular component that is strongly correlated with the production of the charged Zc(3900). In this paper we demonstrate that the nontrivial cross section line shapes of e+e-→ J/ψππ and hcππ can be naturally explained by the molecular scenario. As a consequence we find a significantly smaller mass for the Y(4260) than previous studied. In the e+e-→ D D^*π+c.c. process, with the inclusion of an additional S-wave D^*π contribution constrained from data on the D D^* invariant mass distribution, we obtain a good agreement with the data of the angular distributions. We also predict an unusual line shape of Y(4260) in this channel that may serve as a smoking gun for a predominantly molecular nature of Y(4260). Improved measurements of these observables are therefore crucial for a better understanding of the structure of this famous resonance.