Hidden-charmonium decays of Z c (3900) and Z c (4025) in intermediate meson loops model

Gang Li

doi:10.1140/epjc/s10052-013-2621-5

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2024 Impact factor 4.8

Particles and Fields

Eur. Phys. J. C (2013) 73: 2621
https://doi.org/10.1140/epjc/s10052-013-2621-5

Regular Article - Theoretical Physics

Hidden-charmonium decays of Z _c(3900) and Z _c(4025) in intermediate meson loops model

Gang Li^*

Department of Physics, Qufu Normal University, Qufu, 273165, People’s Republic of China

^* e-mail: gli@mail.qfnu.edu.cn

Received: 24 July 2013
Revised: 9 October 2013
Published online: 5 November 2013

Abstract

The BESIII collaboration reported an observation of two charged charmonium-like structure $Z_{c}^{\pm}(3900)$ and $Z_{c}^{\pm}(4025)$ in e ⁺ e ⁻→(J/ψπ)^± π ^∓ and $e^{+}e^{-} \to(D^{*} \bar{ D}^{*})^{\pm} \pi^{\mp}$ at $\sqrt{s} =4.26$ GeV recently, which could be an analogue of Z _b(10610) and Z _b(10650) claimed by the Belle Collaboration. In this work, we investigate the hidden-charmonium transitions of $Z_{c}^{\pm}(3900)$ and $Z_{c}^{\pm}(4025)$ via intermediate D ^(∗) D ^(∗) meson loops. Reasonable results for the branching ratios by taking appropriate values of α in this model can be obtained, which shows that the intermediate D ^(∗) D ^(∗) meson loops process may be a possible mechanism in these decays. Our results are consistent with the power-counting analysis, and comparable with the calculations in the framework of nonrelativistic effective field theory to some extent. We expect more experimental measurements on these hidden-charmonium decays and search for the decays of $Z_{c}\to D\bar{D}^{*} +c.c$ . and $Z_{c}^{\prime}\to D^{*} \bar{D}^{*}$ , which will help us investigate the $Z_{c}^{(\prime)}$ decays deeply.