Radially excited states of $$\eta _c$$ η c

Wang, Hui; Yan, Z.; Ping, J. L.

doi:10.1140/epjc/s10052-015-3418-5

Cited by 27 publications

(40 citation statements)

References 31 publications

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“…Their decays suggest the J P C = 0 −+ quantum numbers. They have been described in many different ways: hybrids [123], molecules [124,125], and as the second (η c ) and the third (η c ) radial excitations of the η c meson in a standard cc picture [126][127][128]. Both semirelativistic and nonrelativistic potential models [96] obtain masses for η c and η c above the experimental values of X(3940) and X(4160), which casts doubts on these assignments.…”

Section: A X(3915) X(3872) and χC2(2p )mentioning

confidence: 99%

Charmonium spectrum with a Dirac potential model in the momentum space

2017

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We study the charmonium spectrum using a complete one gluon exchange approach based on a phenomenological relativistic qq potential model with Dirac spinors in momentum space. We use phenomenological screening factors to include vacuum quantum effects. Our formulation does not rely on nonrelativistic approximations. We fit the lowest-lying charmonia (below the DD threshold) and predict the higher-lying resonances of the spectrum. In general, we reproduce the overall structure of the charmonium spectrum and, in particular, we can reasonably describe the X(3872) resonance mass as (mostly) a cc state. The numerical values of the free parameters of the model are determined taking into account also the experimental uncertainties of the resonance energies. In this way, we are able to obtain the uncertainties of the theoretical resonance masses and the correlation among the free parameters of the model.

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Section: A X(3915) X(3872) and χC2(2p )mentioning

confidence: 99%

Charmonium spectrum with a Dirac potential model in the momentum space

2017

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“…There are already many theoretical approaches which have been used to study the properties of these XY Z states [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this paper, we mainly discuss the properties and decays of two X states: X (3940) and X (4160).…”

Section: Introductionmentioning

confidence: 99%

“…Reference [7,8] investigated the properties of X (3940) and X (4160), which were η c (3S) and χ c0 (3P), respectively. Reference [13] calculated the strong decays of η c (nS); one found that the explanation of X (3940) as η c (3S) is possible and the assignment of X (4160) as η c (4S) cannot be excluded. In Ref.…”

Section: Introductionmentioning

confidence: 99%

The strong decays of X(3940) and X(4160)

et al. 2017

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“…They were calculated using various models and methods in Refs. [32][33][34][35][36]. Predictions obtained in these papers sometimes differ from each other considerably.…”

Section: Strong Decays Of the Tetraquarks T + Cc;ud And T + Cc;udmentioning

confidence: 99%

“…Therefore, for the decay constant of the pseudoscalar D mesons, we use the available experimental result, whereas for the vector mesons, we use the QCD sum rule prediction from Ref. [35].…”

Section: Strong Decays Of the Tetraquarks T + Cc;ud And T + Cc;udmentioning

confidence: 99%

Strong decays of double-charmed pseudoscalar and scalar ccu¯d¯ tetraquarks

2019

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The strong decays of the pseudoscalar and scalar double-charmed tetraquarks T + cc;ud and T + cc;ud are investigated in the framework of the QCD sum rule method. The mass and coupling of these exotic four-quark mesons are calculated in the framework of the QCD two-point sum rule approach by taking into account vacuum condensates of the quark, gluon, and mixed local operators up to dimension 10. Our results for masses mT = (4130 ±170) MeV and m T = (3845 ±175) MeV demonstrate that these tetraquarks are strong-interaction unstable resonances and decay to conventional mesons through the channels T + cc;ud → D + D * (2007) 0 , D 0 D * (2010) + and T + cc;ud → D + D 0 . Key quantities necessary to compute the partial width of these decay modes, i.e., the strong couplings of two D mesons and a corresponding tetraquark gi, i = 1, 2, and G are extracted from the QCD three-point sum rules. The full width ΓT = (129.9 ± 23.5) MeV demonstrates that the tetraquark T + cc;ud is a broad resonance, whereas the scalar exotic meson with Γ T = (12.4 ± 3.1) MeV can be classified as a relatively narrow state.

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Radially excited states of $$\eta _c$$ η c

Cited by 27 publications

References 31 publications

Charmonium spectrum with a Dirac potential model in the momentum space

Charmonium spectrum with a Dirac potential model in the momentum space

The strong decays of X(3940) and X(4160)

Strong decays of double-charmed pseudoscalar and scalar ccu¯d¯ tetraquarks

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