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arXiv · 2303.03696

The study on the structure of exotic states $χ_{c 1}(3872)$ via beauty-hadron decays in $pp$ collisions at $\sqrt{s}=8\,\mathrm{TeV}$

Chun-tai Wu·Zhi-Lei She·Xin-Ye Peng·Xiao-Lin Kang·Hong-Ge Xu Dai-Mei Zhou·Gang Chen·Ben-Hao Sa
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Abstract

A dynamically constrained phase-space coalescence (DCPC) model was introduced to study the exotic state $χ_{c 1}(3872)$ yield for three possible structures: tetraquark state, nuclear-like state, and molecular state respectively, where the hadronic final states generated by the parton and hadron cascade model (PACIAE). The $χ_{c 1}(3872)$/$ψ(2S)$ cross-section ratio from beauty-hadron decays (non-prompt) based on the $χ_{c 1}(3872)$ or $ψ(2S)\to J/ψ{π^+}{π^-}$ bound state in the decay chains as a function of charged-particle multiplicity and transverse momentum in $pp$ collisions at $\sqrt{s}=8\,\mathrm{TeV}$ are calculated. A tetraquark state scenario from PACIAE+DCPC model shows better agreement with the LHCb and ATLAS measurements for the non-prompt $χ_{c 1}(3872)$/$ψ(2S)$ cross-section ratio distributions, indicating that the $χ_{c 1}(3872)$ is more likely to be a compact tetraquark state.

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Chun-tai Wu, Zhi-Lei She, Xin-Ye Peng, Xiao-Lin Kang, Hong-Ge Xu Dai-Mei Zhou, Gang Chen, Ben-Hao Sa. 2023-03-07. The study on the structure of exotic states $χ_{c 1}(3872)$ via beauty-hadron decays in $pp$ collisions at $\sqrt{s}=8\,\mathrm{TeV}$. https://doi.org/10.1103/physrevd.107.114022

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