Search for $χ_{c_J}(2P)$ from Higher Charmonim E1 Transitions and X,Y,Z States

Li, Baiqing; Meng, Ce; Chao, Kuang-Ta

doi:10.48550/arxiv.1201.4155

Cited by 9 publications

(13 citation statements)

References 32 publications

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“…is in agreement with the predictions in various potential models [9,78]. At the same time, we can easily estimate the branching fraction…”

Section: ψ(4160)supporting

confidence: 89%

Radiative transitions of charmonium states in a constituent quark model

Deng¹,

Gui²,

Xiao³

et al. 2015

Preprint

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We study the electromagnetic (EM) transitions of the nS , nP (n ≤ 3), and nD (n ≤ 2) charmonium states with a constituent quark model. We obtain a reasonable description of the EM transitions of the well-established charmonium states J/ψ, ψ(2S ), χ cJ (1P), h c (1P) and ψ(3770). We find that the M2 transitions give notable corrections to some E1 dominant processes by interfering with the E1 transitions. Our predictions of EM decay properties for the higher charmonium states are also presented and compared with other model predictions. In particular, we discuss the EM decay properties of some "XYZ" states, such as X(3823), X(3872), X(3915), X(3940) and X(4350) as conventional charmonium states. Assuming X(3872) as the χ c1 (2P) state, our predicted ratio Γ[X(3872) → ψ(2S )γ]/Γ[X(3872) → J/ψγ] ≃ 4.0 is consistent with BaBar's measurement.

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“…is in agreement with the predictions in various potential models [9,78]. At the same time, we can easily estimate the branching fraction…”

Section: ψ(4160)supporting

confidence: 89%

Radiative transitions of charmonium states in a constituent quark model

Deng¹,

Gui²,

Xiao³

et al. 2015

Preprint

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“…The linear potential br is widely used in the potential models. Considering the screening effect from the vacuum polarization effect of the dynamical light quark might soft the linear potential at large distances [46,47], people suggested a screened potential b(1−e −µr )/µ in the calculations as well [10,11,15,16,48].…”

Section: A Formalismmentioning

confidence: 99%

“…Stimulated by the extensive progress made in the observation of the charmonia, in this work we study the mass spectrum and electromagnetic (EM) transitions of charmonium within the widely used linear potential model [7][8][9], and the screened potential model [10,11]. As we know, the EM decays of a hadron are sensitive to its inner structure.…”

Section: Introductionmentioning

confidence: 99%

“…The study of the EM decays not only is crucial for us to determine the quantum numbers of the newly observed charmonium states, but also provides very useful references for our search for the missing charmonium states in experiments. To study the charmonium spectrum and/or their EM decays, beside the widely used potential models [7][8][9][10][11][12][13][14][15][16][17][18], some other models, such as lattice QCD [19][20][21][22][23][24][25][26], QCD sum rules [27][28][29], coupled-channel quark models [30], effective Lagrangian approach [31,32], nonrelativistic effective field theories of QCD [33][34][35][36], relativistic quark model [37], relativistic Salpeter method [38], light front quark model [39], Coulomb gauge approach [40], and generalized screened potential model [41] have been employed in theory. Recently, the hadronic loop contributions to the radiative decay of charmonium states were also discussed in Refs.…”

Section: Introductionmentioning

confidence: 99%

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Charmonium spectrum and electromagnetic transitions with higher multipole contributions

et al. 2017

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The charmonium spectrum is calculated with two nonrelativistic quark models, the linear potential model and the screened potential model. Using the obtained wavefunctions, we evaluate the electromagnetic transitions of charmonium states up to 4S multiplet. The higher multipole contributions are included by a multipole expansion of the electromagnetic interactions. Our results are in reasonable agreement with the measurements. As conventional charmonium states, the radiative decay properties of the newly observed charmonium-like states, such as X(3823), X(3872), X(4140/4274), are discussed. The X(3823) as ψ 2 (1D), its radiative decay properties well agree with the observations. From the radiative decay properties of X(3872), one can not exclude it as a χ c1 (2P) dominant state. We also give discussions of possibly observing the missing charmonium states in radiative transitions, which might provide some useful references to look for them in forthcoming experiments. The higher multipole contributions to the electromagnetic transitions are analyzed as well. It is found that the higher contribution from the magnetic part could give notable corrections to some E1 dominant processes by interfering with the E1 amplitudes. Our predictions for the normalized magnetic quadrupole amplitudes M 2 of the χ c1,2 (1P) → J/ψγ processes are in good agreement with the recent CLEO measurements.

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“…In order to understand these recently observed charmonium-like states, a better understanding of the charmonium spectrum can be regarded as a prerequisite. In this work we take the strategy of studying systematically the charmonium open flavor decays within the widely used linear potential (LP) model [12][13][14] and screened potential (SP) model [15,16] such that most of the conventional charmonium states can be identified by comparing with the experimental measurements. Although it should be recognized that the SP model may not be sufficient for including the full open threshold effects, we anticipate that unusual phenomena arising from such a study would indicate signals for unconventional structures of some of those charmoniumlike states.…”

Section: Introductionmentioning

confidence: 99%

Strong decays of higher charmonium states into open-charm meson pairs

Gui

Lü

et al. 2018

Phys. Rev. D

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The open-charm strong decays of higher charmonium states up to the mass of the 6P multiplet are systematically studied in the 3 P 0 model. The wave functions of the initial charmonium states are calculated in the linear potential (LP) and screened potential (SP) quark model. The decay widths for most of the well-established charmonium states above the open-charm thresholds can be reasonably described. By comparing our quark model calculations with the experimental observations we also discuss the nature of some of the newly observed charmonium-like states. It is found that (i) the ψ(4415) may favor the ψ(4S ) or ψ 1 (3D) assignment. There may exist two highly overlapping vector charmonium states around 4.4 GeV; (ii) In the LP model the J PC = 1 −− Y(4660) resonance and the J PC = 0 ++ X(4500) resonance may be assigned as the ψ(5S ) and χ c0 (4P), respectively; (iii) The newly observed state X * (3860) can be assigned as the χ c0 (2P) state with a narrow width of about 30 MeV; (iv) It seems to be difficult to accommodate the X(4140) and X(4274) states in the same potential model as excited χ c1 states. (v) The X(3940) resonance can be assigned as the η c (3S ) state; (vi) The vector charmonium-like states Y(4230/4260, 4360) and scalar X(4700) cannot be described by any conventional charmonium states self-consistently in our model. PACS numbers:

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Search for $χ_{c_J}(2P)$ from Higher Charmonim E1 Transitions and X,Y,Z States

Cited by 9 publications

References 32 publications

Radiative transitions of charmonium states in a constituent quark model

Radiative transitions of charmonium states in a constituent quark model

Charmonium spectrum and electromagnetic transitions with higher multipole contributions

Strong decays of higher charmonium states into open-charm meson pairs

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