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

2015/07/31 by Bo Wang, Hao Xu, Xiang Liu +3 · 1 citation
Physics and Astronomy · #hep-ex #hep-ph

paper · pdf · doi:10.1007/s11467-016-0564-7

published as Front. Phys. 11, 111402 (2016) · 8 pages, 1 table, 5 figures. Accepted by Frontiers of Physics

arxiv created 2016/02/02 · arxiv updated 2016/03/01

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(1³D₂). Because the X(3823) is just near the DD^* 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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