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Using X(3823)→J/ψπ + π − to identify coupled-channel effects

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Abstract

Very recently, the Belle and BESIII experiments observed a new charmonium-like state X(3823), which is a good candidate for the D-wave charmonium ψ(13 D 2). Because the X(3823) is just near the D \(\bar D*\) threshold, the decay X(3823)→ J/ψπ + π − can be a golden channel to test the significance of coupled-channel effects. In this work, this decay is considered including both the hidden-charm dipion and the usual quantum chromodynamics multipole expansion (QCDME) contributions. The partial decay width, the dipion invariant mass spectrum distribution dΓ[X(3823) → J/ψπ + π −]/dm π+π−, and the corresponding dΓ[X(3823) → J/ψπ + π −]/dcosθ distribution are computed. Many parameters are determined from existing experimental data, so the results depend mainly only on one unknown phase between the QCDME and hidden-charm dipion amplitudes.

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Authors and Affiliations

  1. Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou, 730000, China

    Bo Wang, Hao Xu, Xiang Liu & Dian-Yong Chen

  2. School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China

    Bo Wang, Hao Xu & Xiang Liu

  3. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Dian-Yong Chen & Susana Coito

  4. Theoretical Physics Department, Fermilab, IL, 60510, USA

    Estia Eichten

Authors
  1. Bo Wang
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  2. Hao Xu
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  3. Xiang Liu
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  4. Dian-Yong Chen
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Correspondence to Bo Wang.

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Wang, B., Xu, H., Liu, X. et al. Using X(3823)→J/ψπ + π − to identify coupled-channel effects. Front. Phys. 11, 111402 (2016). https://doi.org/10.1007/s11467-016-0564-7

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