Hadronic molecules in the open charm and open bottom baryon spectrum

Ortega, Pablo G.; Entem, D. R.; Fernández, F.

doi:10.1103/physrevd.90.114013

Cited by 14 publications

(12 citation statements)

References 31 publications

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“…Starting from early quark models [1], work along this line has been rather extensive and fruitful [2][3][4][5][6][7][8]. QCD lattice has also contributed to this area [9][10][11] and dynamical models building molecular states in coupled meson-baryon channels [12][13][14][15][16][17][18][19][20][21][22][23][24] have also brought their share to this intense research. There are also many review papers on the subject to which we refer the reader [25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Description of the $$\Xi _c$$ Ξ c and $$\Xi _b$$ Ξ b states as molecular states

Pavao

Debastiani

et al. 2019

Eur. Phys. J. C

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In this work we study several c and b states dynamically generated from the meson-baryon interaction in coupled channels, using an extension of the local hidden gauge approach in the Bethe-Salpeter equation. These molecular states appear as poles of the scattering amplitudes, and several of them can be identified with the experimentally observed c states, including the c (2790), c (2930), c (2970), c (3055) and c (3080). Also, for the recently reported b (6227) state, we find two poles with masses and widths remarkably close to the experimental data, for both the J P = 1/2 − and J P = 3/2 − sectors.

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Section: Introductionmentioning

confidence: 99%

Description of the $$\Xi _c$$ Ξ c and $$\Xi _b$$ Ξ b states as molecular states

Pavao

Debastiani

et al. 2019

Eur. Phys. J. C

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“…The meson-meson interaction is described in the framework of a constituent quark model 1 successfully employed to explain the meson and baryon phenomenology from the light to the heavy quark sector [46][47][48][49][50][51][52][53][54][55]. Moreover, the D ( * )D * interaction deduced from the model has been satisfactorily used to describe meson-meson [56][57][58] and meson-baryon [59][60][61][62] molecular states such as the X (3872) as a DD * molecule coupled to cc(n 3 P 1 ) states [63,64].…”

Section: Introductionmentioning

confidence: 99%

The $$Z_c$$ Z c structures in a coupled-channels model

et al. 2019

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The Z c (3900) ± /Z c (3885) ± and Z c (4020) ± are two charmonium-like structures discovered in the π J/ψ and D * D(*) +h.c. invariant mass spectra. Their nature is puzzling due to their charge, which forces its minimal quark content to be ccud (ccdū). Thus, it is necessary to explore four-quark systems in order to understand their inner structure. Additionally, their strong coupling to channels such as π J/ψ and the closeness of their mass to D * D(*)-thresholds stimulates both a molecular interpretation or a coupled-channels threshold effect. In this work we perform a coupled-channels calculation of the I G (J PC) = 1 + (1 +−) sector including D (*)D * +h.c., π J/ψ and ρη c channels in the framework of a constituent quark model which satisfactorily describes a wide range of properties of (non-)conventional hadrons containing heavy quarks. The meson-meson interactions are dominated by the non-diagonal π J/ψ − D * D(*) and ρη c − D * D(*) couplings which indicates that the Z c (3900) ± /Z c (3885) ± and Z c (4020) ± are unusual structures. The study of the analytic structure of the S-matrix allows us to conclude that the point-wise behavior of the line shapes in the π J/ψ and DD * invariant mass distributions is due to the presence of two virtual states that produce the Z c peaks.

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“…This model successfully describes hadron phenomenology and hadronic reactions [46][47][48] and has recently been applied to (non)conventional hadrons containing heavy quarks (see, for instance, Refs. [49][50][51][52][53][54][55]).…”

Section: Introductionmentioning

confidence: 99%

Molecular components in P -wave charmed-strange mesons

et al. 2016

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Results obtained by various experiments show that the D * s0 (2317) and Ds1(2460) mesons are very narrow states located below the DK and D * K thresholds, respectively. This is markedly in contrast with the expectations of naive quark models and heavy quark symmetry. Motivated by a recent lattice study which addresses the mass shifts of the cs ground states with quantum numbers J P = 0 + (D * s0 (2317)) and J P = 1 + (Ds1(2460)) due to their coupling with S-wave D ( * ) K thresholds, we perform a similar analysis within a nonrelativistic constituent quark model in which quark-antiquark and meson-meson degrees of freedom are incorporated. The quark model has been applied to a wide range of hadronic observables and thus the model parameters are completely constrained. The coupling between quark-antiquark and meson-meson Fock components is done using a 3 P0 model in which its only free parameter γ has been elucidated performing a global fit to the decay widths of mesons that belong to different quark sectors, from light to heavy. We observe that the coupling of the 0 + (1 + ) meson sector to the DK (D * K) threshold is the key feature to simultaneously lower the masses of the corresponding D * s0 (2317) and Ds1(2460) states predicted by the naive quark model and describe the Ds1(2536) meson as the 1 + state of the j P q = 3/2 + doublet predicted by heavy quark symmetry, reproducing its strong decay properties. Our calculation allows to introduce the coupling with the D-wave D * K channel and the computation of the probabilities associated with the different Fock components of the physical state.

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Hadronic molecules in the open charm and open bottom baryon spectrum

Cited by 14 publications

References 31 publications

Description of the $$\Xi _c$$ Ξ c and $$\Xi _b$$ Ξ b states as molecular states

Description of the $$\Xi _c$$ Ξ c and $$\Xi _b$$ Ξ b states as molecular states

The $$Z_c$$ Z c structures in a coupled-channels model

Molecular components in P -wave charmed-strange mesons

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