Reanalysis of the $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }{\pi }^{\mp }$ reaction and the claim for the $Z_c(4025)$ resonance

Abstract

In this paper we study the reaction $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }{\pi }^{\mp }$ in which the BESIII collaboration has claimed the existence of a $1^{+}$ resonance, named $Z_c(4025)$, in the $D^{\ast }{\bar{D}}^{\ast }$ invariant mass spectrum with a mass around 4026 MeV and width close to 26 MeV. We determine the $D^{\ast }{\bar{D}}^{\ast }$ invariant mass distribution and find that although the explanation considered by the BESIII collaboration is plausible, there are others which are equally possible, like a $2^{+}$ resonance or a bound state. Even more, we find that the data can be explained without the existence of a resonance/bound state. In view of the different possible interpretations found for the BESIII data, we try to devise a strategy which could help in identifying the origin of the signal reported by the BESIII collaboration. For this, we study the dependence of the $D^{\ast }{\bar{D}}^{\ast }$ spectrum considering the different options as a function of the total center of mass energy. We arrive to the conclusion that increasing the center of mass energy from 4.26 GeV to 4.6 GeV can be useful to distinguish between a resonance, a bound state or just a pure background as being responsible for the signal found. This information should be useful for future experiments.

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Cited by in corpus (13)

• Reanalysis of the $Y(3940)$, $Y(4140)$, $Z_c(4020)$, $Z_c(4025)$ and $Z_b(10650)$ as molecular states with QCD sum rules
• BB interactions with static bottom quarks from Lattice QCD
• Analysis of the $Z_c(4020)$, $Z_c(4025)$, $Y(4360)$ and $Y(4660)$ as vector tetraquark states with QCD sum rules
• Prediction of an $I=1$ $D{\bar{D}}^{\ast }$ state and relationship to the claimed $Z_c(3900)$, $Z_c(3885)$
• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• Observation of a neutral charmoniumlike state $Z_c(4025{)}^0$ in $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^0{\pi }^0$
• Prediction of a $Z_c(4000)$ $D^{\ast }{\bar{D}}^{\ast }$ state and relationship to the claimed $Z_c(4025)$
• Why $\Xi (1690)$ and $\Xi (2120)$ are so narrow?
• $J/\psi$ regeneration in a hadron gas: an update
• The strange cousin of the $Z_c(4020/4025)$ as tetraquark state
• Understanding close-lying exotic charmonia states within QCD sum rules
• Signature of an $h_1$ state from $J/\psi \to \eta K^{\ast 0}{\bar{K}}^{\ast 0}$ and theoretical description of the $Z_c(3900)$ and $Z_c(4020)$ as $D{\bar{D}}^{\ast }$ and $D^{\ast }{\bar{D}}^{\ast }$ molecular states
• X, Y and Z States