Exploring hidden-charm and hidden-strange hexaquark states from lattice QCD

Liu, Hang; He, Jinchen; Liu, Liuming; Sun, Peng; Wang, Wei; Yang, Yi-Bo; Zhang, Qi-An

doi:10.1007/s11433-023-2205-0

Sci. China Phys. Mech. Astron.

2023

DOI: 10.1007/s11433-023-2205-0

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Exploring hidden-charm and hidden-strange hexaquark states from lattice QCD

Hang Liu,

Jinchen He,

Liuming Liu

et al.

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Cited by 6 publications

References 53 publications

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Separation of infrared and bulk in thermal QCD

Meng,

Sun,

Alexandru

et al. 2024

J. High Energ. Phys.

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A new thermal regime of QCD, featuring decoupled scale-invariant infrared glue, has been proposed to exist both in pure-glue (Nf=0) and “real-world” (Nf=2+1 at physical quark masses) QCD. In this IR phase, elementary degrees of freedom flood the infrared, forming a distinct component independent from the bulk. This behavior necessitates non-analyticities in the theory. In pure-glue QCD, such non-analyticities have been shown to arise via Anderson-like mobility edges in Dirac spectra (λIR = 0, ±λA ≠ 0), as manifested in the dimension function dIR(λ). Here, we present the first evidence, based on lattice QCD calculation at a=0.105 fm, that this mechanism is also at work in real-world QCD, thus supporting the existence of the proposed IR regime in nature. An important aspect of our results is that, while at T = 234 MeV we find a dimensional jump between zero modes and lowest near-zero modes very close to unity (dIR = 3 to dIR ≃ 2), similar to the IR phase of pure-glue QCD, at T = 187 MeV we observe a continuous λ-dependence. This suggests that thermal states just above the chiral crossover are non-analytically (in T) connected to thermal state at T = 234 MeV, supporting the key original proposition that the transition into the IR regime occurs at a temperature strictly above the chiral crossover.

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Separation of infrared and bulk in thermal QCD

Meng,

Sun,

Alexandru

et al. 2024

J. High Energ. Phys.

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Charming exotics from lattice QCD

Liu

2023

Sci. China Phys. Mech. Astron.

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Improved method to determine the Ξc−Ξc′ mixing

Liu,

Wang,

Zhang

2024

Phys. Rev. D

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We develop an improved method to explore the Ξc−Ξc′ mixing, which arises from the flavor SU(3) and heavy quark symmetry breaking. In this method, the flavor eigenstates under the SU(3) symmetry are at first constructed, and the corresponding masses can be nonperturbatively determined. Matrix elements of the mass operators, which break the flavor SU(3) symmetry sandwiched by the flavor eigenstates, are then calculated. Diagonalizing the corresponding matrix of Hamiltonian gives the mass eigenstates of the full Hamiltonian and determines the mixing. Following the previous lattice QCD calculation of Ξc and Ξc′, and estimating an off diagonal matrix element, we extract the mixing angle between the Ξc and Ξc′. Preliminary numerical results for the mixing angle confirm the previous observation that such mixing is incapable to explain the large SU(3) symmetry breaking in semileptonic decays of charmed baryons. Published by the American Physical Society 2024

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Exploring hidden-charm and hidden-strange hexaquark states from lattice QCD

Cited by 6 publications

References 53 publications

Separation of infrared and bulk in thermal QCD

Separation of infrared and bulk in thermal QCD

Charming exotics from lattice QCD

Improved method to determine the Ξc−Ξc′ mixing

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