X(2900) in a chiral quark model

Abstract

Recently, the LHCb Collaboration reported their observation of the first two fully open-flavor tetraquark states named $X_0(2900)$ and $X_1(2900)$ with unknown parity. Inspired by the report, we consider all of possible four-quark candidates of $X(2900)$ including molecular structure and diquark structure in a chiral quark model with the help of Gaussian expansion method. Two different structures coupling is also considered. To identify the genuine resonances, real-scaling method (stabilization method) was employed. The results show that no candidate of $X(2900)$ is founded in $00^{+}$ and $01^{+}$ $cs\bar{q}\bar{q}$ system below the threshold of $D^{\ast }{\bar{K}}^{\ast }$, while there are two states in the $P$-wave excited $cs\bar{q}\bar{q}$ system, $D_1\bar{K}$ and $D_J\bar{K}$, which could be candidates of $X(2900)$. In this way, we assign negative parity to $X_1(2900)$, and $X_0(2900)$ maybe a resonance state above the threshold of $D^{\ast }{\bar{K}}^{\ast }$, more calculation is needed.

arXiv comment7 pages, 4 figures

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Cited by in corpus (11)

• Hadronic molecules in B decays
• Investigation of hidden-charm pentaquarks with strangeness $S=-1$
• Charmed-strange tetraquarks and their decays in a potential quark model
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Spectrum of the molecular tetraquarks: Unraveling the $T_{cs0}(2900)$ and $T_{c\bar{s}0}^a(2900)$
• Unified description of the $Qs\bar{q}\bar{q}$ molecular bound states, molecular resonances and compact tetraquark states in the quark potential model
• Analysis of $\Omega (2012)$ as a molecule in the chiral quark model
• Magnetic moment of the $X_1(2900)$ state in the diquark-antidiquark picture
• Double pole structures of $X_1(2900)$ as the $P$-wave ${\bar{D}}^{\ast }{K}^{\ast }$ resonances
• ${\Xi }_c(3055)$ as a scaling point to establish the excited ${\Xi }_c^{(\prime )}$ family
• Exotic hadrons associated with $b$-quark