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X(3872) in lattice QCD with exact chiral symmetry

TWQCD Collaboration·Ting-Wai Chiu·Tung-Han Hsieh
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Abstract

We investigate the mass spectrum of $ 1^{++} $ exotic mesons with quark content $ (\c\q\cbar\qbar) $, using molecular and diquark-antidiquark operators, in quenched lattice QCD with exact chiral symmetry. For the molecular operator $ \{(\qbarγ_i\c)(\cbarγ_5\q)- (\cbarγ_i\q)(\qbarγ_5\c) \} $ and the diquark-antidiquark operator $ \{(\q^T C \gi \c)(\qbar C γ_5 \cbar^T)-(\qbar C \gi^T \cbar^T)(\q^T C γ_5 \c) \} $, both detect a resonance with mass around $ 3890 \pm 30 $ MeV in the limit $ m_q \to m_u $, which is naturally identified with $ X(3872) $. Further, heavier exotic meson resonance with $ J^{PC} = 1^{++} $ is also detected, with quark content $ (\c\s\cbar\sbar) $ around $ 4100 \pm 50 $ MeV.

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TWQCD Collaboration, Ting-Wai Chiu, Tung-Han Hsieh. 2006-07-20. X(3872) in lattice QCD with exact chiral symmetry. https://doi.org/10.1016/j.physletb.2007.01.019

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