D⁺D^- hadronic atom and its production in pp and pp collisions

2021/11/30 by Pan-Pan Shi, Zhen-Hua Zhang, Feng-Kun Guo +2
Chemistry · Physics and Astronomy · #Atomic physics #Bar (unit) #Binding energy #Chemistry #Coulomb #Crystallography #Energy (signal processing) #Ground state #Hadron #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ex #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevd.105.034024

published as Phys. Rev. D 105, 034024 (2022) · 25 pages, 5 figures. Version to appear in Phys. Rev. D

arxiv created 2022/02/12 · openalex publication_date 2022/02/23 · openalex created_date 2022/02/24 · arxiv updated 2022/03/01 · openalex updated_date 2026/08/01

Abstract

There must be Coulomb bound states of a pair of hadrons, which are stable against the strong interaction, with opposite electric charges. Such bound states are hadronic atoms. We study the properties and the production of the ground-state D⁺D^- hadronic atom A_D⁺D^-, called dionium, with quantum numbers J^PC=0⁺⁺. Using a nonrelativistic effective field theory for the D⁰D⁰-D⁺D^- coupled-channel system, the mass of the ground-state dionium is predicted to be (3739.3 ± 0.1)~MeV, with the binding energy reduced by about 10% compared to the Coulomb binding energy due to the strong interaction. Its width for the decay into the neutral D⁰ D⁰ channel is predicted to be 1.8^+1.4_-0.6 keV using lattice inputs for the D D strong interaction. The cross section for the inclusive prompt production of the dionium at CMS and LHCb and that for the direct production p p→ A_D⁺D^- at PANDA are estimated at an order-of-magnitude level. In particular, we expect that O(10³∼ 10⁵) events of the reaction chain p p→ A_D⁺D^-→ D⁰ D⁰ → K^-π⁺K⁺π^- can be collected at PANDA, and valuable information on the charmed meson interaction and on understanding charmoniumlike states will be obtained.

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