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Mass spectrum and strong decays of tetraquark $$bar c bar s qq$$ states

テトラクォーク$$bar c bar s qq$$状態の質量スペクトルと強い相互作用による崩壊

Wang, G.-J.*; Meng, L.*; Xiao, L.-Y.*; 岡 眞  ; Zhu, S.-L.*

Wang, G.-J.*; Meng, L.*; Xiao, L.-Y.*; Oka, Makoto; Zhu, S.-L.*

クォーク模型を用いて、S波の$$bar c bar s qq$$テトラクォーク状態の質量を計算し、さらに$$D^{-(*)}K^{(*)}$$チャネルへの崩壊幅の計算を行った。これらは、最近LHCbで報告されている$$X^0(2900)$$状態の理解につながる。また、対応する$$I=0$$の状態として、$$X(2649)$$を予言した。この状態が実験的に見つかることで、この模型が実証されてインパクトが大きい。

The mass spectrum and strong decays of the S-wave $$bar c bar s qq$$ states are studied in the compact tetraquark scenario with the quark model. The model consists of the Coulomb, the linear confinement, and the hyperfine interactions. We calculate their decay amplitudes into the $$D^{-(*)}K^{(*)}$$ channels using the quark interchange method. The mass and decay width of the $$I(J^P)=1(0^+)$$ state are $$M = 2941$$ MeV and $$Gamma_X=26.6$$ MeV, respectively, which indicates that it might be a good candidate for the recently observed $$X^0(2900)$$ state. We also obtain an isospin partner state $$I(J^P)= 0(0^+)$$ with $$M =2649$$ MeV and $$Gamma_{Xto D^- K}= 48.1$$ MeV, respectively. Future experimental search for $$X(2649)$$ will be very helpful.

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