Evidence for the decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">→</mml:mo><mml:mi mathvariant="normal">ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>2</mml:mn><mml:mi mathvariant="normal">S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mi mathvariant="normal">γ</mml:mi></mml:math>

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doi:10.1016/j.nuclphysb.2014.06.011

Cited by 127 publications

(75 citation statements)

References 50 publications

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“…He found no other J PC , no charged modes, and no DD molecules exist in this model. Under this molecule picture, Swanson calculated the ratio of B(X(3872) → ψ γ) with respect to B(X(3872) → J/ψγ) to be 4 × 10 −3 [197,219], which largely deviated from the experimental data 3.4 ± 1.4 [89] and 2.46 ± 0.64 ± 0.29 [92]. He derived the ratio of B(X(3872) → γJ/ψ) with respect to B(X(3872) → J/ψπ + π − ) to be around 10 −2 [197,219], while the experimental value is 0.14 ± 0.05 [75] and 0.33 ± 0.12 [89].…”

Section: Molecular Schemementioning

confidence: 80%

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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.

show abstract

Section: Molecular Schemementioning

confidence: 80%

“…However, both the BaBar and LHCb experiments observed this decay mode, and this branching fraction was measured to be (3.4 ± 1.4) [89] and (2.46 ± 0.64 ± 0.29) [92], respectively.…”

Section: The Charmonium-like Xyz Statesmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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show abstract

“…The existence of this cc(2P) pole has been predicted by quark models but has not been observed because it strongly couples to the open charm channels. We would like to point out that the fluctuation at around 3900-4000 MeV in the final ψ(2S )γ mass spectrum (but not seen in the final J/ψγ mass spectrum) measured by LHCb [7] may correspond to this enhancement. If that is the case, it will give us a novel method to reveal heavy quarkonia embedded in the continuum.…”

Section: Resultsmentioning

confidence: 94%

Radiative Decays of the X(3872) in the Charmonium-Molecule Hybrid Picture

Takeuchi¹,

Takizawa²,

Shimizu³

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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The radiative decay from the X(3872) is investigated by employing a charmonium-molecule hybrid model, which explains many of the other observed features of X(3872). The X(3872) is treated as a resonance and it is assumed that the decay occurs from the charmonium components. The invariant mass spectra of the final J/ψγ and ψ(2S )γ decay can be calculated by this approach. The ratio of the branching fractions of the X(3872) radiative decays, R γ = Br(X(3872) → ψ(2S )γ) / Br(X(3872) → J/ψγ) is calculated by integrating the mass spectrum. It is found that the bound state approach is valid for this ratio. It is also found that an enhancement appears at around E∼3950-4000 MeV in the ψ(2S )γ spectrum but not in the J/ψγ spectrum. This corresponds to the missing cc(2P) pole which was predicted by quark models but has not been observed due to the coupling to the DD states. We would like to point out that the fluctuation seen in the experimental ψ(2S )γ spectrum reported by LHCb may correspond to this cc(2P) pole.

show abstract

“…The observation of the X(3872) revealed that the meson spectroscopy is far more complicated than the naive expectation of the quark model. Later the X(3872) has been observed to decay to several other final states: J/ψγ [9], ψ ′ γ [10], J/ψπ + π − π 0 [11] and D 0D * 0 [12,13]. Also it has been observed in the decay B 0 → X(3872)K + π − (X(3872) → J/ψπ + π − ) by Belle, where B 0 → X(3872)K * (892) 0 is not dominant [14], and in the process e + e − → γX(3872) for the first time with a statistical significance of 6.3σ by BESIII using data samples at center-of-mass energies from 4.009 to 4.420 GeV [15].…”

Section: The X Statesmentioning

confidence: 99%