SPECIAL ISSUE — Chiral Symmetry in Hadrons and Nuclei; Guest Editors: Li-Sheng Geng, Jie Meng, Qiang Zhao and Bing-Song ZouNo Access

How to distinguish a molecule from an 'elementary' particle?

L. Y. Dai

Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

Present address: Theory Center, Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA.

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M. Shi

Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

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G. Y. Tang

Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

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, and

H. Q. Zheng

Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

Collaborative Innovation Center of Quantum Matter, Beijing, China

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https://doi.org/10.1142/S0218301314610023Cited by:0 (Source: Crossref)

Abstract

We discuss how to use Morgan's pole counting rule to distinguish a molecular state from an 'elementary' particle. As two examples we focus on X(3872) and f₀(980) particles. A molecule may be generated from a meson loop bubble chain, and an 'elementary' particle is related to an explicit interaction field in the effective lagrangian and propagates with a Breit–Wigner propagator. For X(3872) it is found that the data favor the 'elementary' particle explanation. For f₀(980) the study becomes much more difficult, since highly nonperturbative dynamics is involved. A unitarization model analysis suggests that f₀(980)'s property is quite exotic. Unlike other light scalars, it does not behave like a state, and could be interpreted as a molecule.

Based on a plenary talk presented at the Seventh International Symposium on Chiral Symmetry in Hadrons and Nuclei, Beijing, China, 27–30 October 2013.

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