Could Z c (4025) be a J P =1+ $D^{*}\bar{D}^{*}$ molecular state?

Cui, Chun-Yu; Liu, Yong-Lu; Huang, Ming-Qiu

doi:10.1140/epjc/s10052-013-2661-x

Cited by 65 publications

(74 citation statements)

References 33 publications

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“…The molecular type of interpolating currents were employed to investigate the Z c (3900) and Z c (4020) states in QCD sum rules in Refs [432,433,475,476,430,431,477,478]. The extracted mass agrees with the experimental values within errors.…”

Section: Other Molecular Models On the Z C (3900) And Z C (4025)mentioning

confidence: 80%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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Section: Other Molecular Models On the Z C (3900) And Z C (4025)mentioning

confidence: 80%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…The transmission has found application in helicopter transmissions [1] and other important aviation transmission device widely. Some domestic and foreign experts [2][3][4][5][6] have done the related research work in the principle of gear engagement, tooth surface contact strength, tooth root bending strength, tooth profile machining and profile modification. Due to the gear transmission system includes parameters of gear backlashes [7], time-varying mesh stiffness [8], mesh damping [9], transmission errors [10], tooth surface friction [11], the system is a strongly nonlinear system and the vibration properties of the gear system will directly affect the stability and reliability of the system [12].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Vibration Analysis of Helical Face-Gear Transmission System with Multi-Factor

et al. 2016

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Abstract.A systematic analysis of the dynamics of a helical face-gear system with 8 degree of freedom is performed in this study under complex excitation. The nonlinear dynamic system is solved by the Runge-Kutta method. The bifurcation and dynamic load characteristics of the system is identified from a series of diagrams. The effect of multi-factor on bifurcation diagrams is also analysed. The results real that with the increase of dimensionless frequency, the system undergoes the process of periodic, chaotic and periodic motions. The amplitude of the dynamic load gradually increases in a certain range and begins to decrease at a certain value. A higher mesh damping coefficient or a higher input torque or a lower gear backlash can reduce the vibration or eliminate chaotic responses.

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“…Until now, their inner structures have not been well determined by theory. In the literature possible interpretations include molecular states [6,7,8,9,10,11], tetraquark states [12,13,14,15,16], and enhancement structures [17,18], etc.…”

Section: Introductionmentioning

confidence: 99%

“…Utilizing the QCD Sum Rules, people have successfully estimated the mass of Z c (3900) and Z c (4025) with DD * and D * D * currents respectively [6,11]. These successes intrigue enormous interests of theorists.…”

Section: Introductionmentioning

confidence: 99%

Molecular states with hidden charm and strange in QCD Sum Rules

Qiao¹,

Tang²

2014

EPL

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This work uses the QCD Sum Rules to study the masses of the D sD * s and D * sD * s molecular states with quantum numbers J P C = 1 +− . Interpolating currents with definite C-parity are employed, and the contributions up to dimension eight in the Operator Product Expansion (OPE) are taken into account. The results indicate that two hidden strange charmonium-like states may exist in the energy ranges of 3.83 ∼ 4.13 GeV and 4.22 ∼ 4.54 GeV, respectively. The hidden strange charmonium-like states predicted in this work may be accessible in future experiments, e.g. BESIII, BelleII and SuperB. Possible decay modes, which may be useful in further research, are predicted.

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Could Z c (4025) be a J P =1+ $D^{}\bar{D}^{}$ molecular state?

Cited by 65 publications

References 33 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Nonlinear Vibration Analysis of Helical Face-Gear Transmission System with Multi-Factor

Molecular states with hidden charm and strange in QCD Sum Rules

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