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2013

Decoding the riddle of Y(4260) and $Z_c(3900)$

Wang, Qian, Hanhart, Christoph, Zhao, Qiang

Understand

The observation of $Z_c(3900)$ by the BESIII collaboration in the invariant mass spectrum of $J/\psi\pi^\pm$ in $e^+e^-\to J/\psi\pi^+\pi^-$ at the center of mass 4.260 GeV suggests the existence of a charged $\bar D D^*+D\bar D^*$ molecular state with $I(J^P)=1(1^+)$, which could be an isovector brother of the famous X(3872) and an analogue of $Z_b(10610)$ claimed by the Belle Collaboration.

We demonstrate that this observation provides strong evidence that the mysterious Y(4260) is a $\bar{D}D_1(2420) +D\bar{D}_1(2420)$ molecular state.
Especially, we show that the decay of this molecule naturally populates low momentum $\bar DD^*$ pairs and leads unavoidably to a cusp at the $\bar DD^*$ threshold.
We discuss the signatures that distinguish such a $\bar DD^*$ cusp from the presence of a true resonance.

Built on

S. Weinberg, Phys. Rev. 137
1965
Earlier work this paper cites.
D. V. Bugg, B. S. Zou and A. V. Sarantsev, Nucl. Phys. B 471
1996
Earlier work this paper cites.
R. Casalbuoni et al
1997
Earlier work this paper cites.
V. Baru et al
2004
Earlier work this paper cites.
E. Swanson, Int. J. Mod. Phys. A 21
2006
Earlier work this paper cites.
P. Colangelo et al
2006
Earlier work this paper cites.
R. Mizuk et al
2008
Earlier work this paper cites.