Searching for observable effects induced by anomalous triangle singularities

Liu, Xiaohai; Oka, M.; Zhao, Qiang

doi:10.1016/j.physletb.2015.12.027

Cited by 125 publications

(149 citation statements)

References 54 publications

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“…The same ideas were shared by Ref. [25], where manifestation of the anomalous triangle singularity were analyzed in various processes, including a 1 ð1260Þ → f 0 ð980Þπ decay.…”

Section: Introductionmentioning

confidence: 79%

New a1(1420) state: Structure, mass, and width

2018

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The structure, spectroscopic parameters and width of the resonance with quantum numbers J PC ¼ 1 þþ discovered by the COMPASS Collaboration and classified as the a 1 ð1420Þ meson are examined in the context of QCD sum rule method. In the calculations the axial-vector meson a 1 ð1420Þ is treated as a fourquark state with the diquark-antidiquark structure. The mass and current coupling of a 1 ð1420Þ are evaluated using QCD two-point sum rule approach. Its observed decay mode a 1 ð1420Þ → f 0 ð980Þπ, and kinematically allowed ones, namely a 1 → K ÃAE K ∓ , a 1 → K Ã0K0 and a 1 →K Ã0 K 0 channels are studied employing QCD sum rules on the light-cone. Our prediction for the mass of the a 1 ð1420Þ state m a 1 ¼ 1416

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“…The same ideas were shared by Ref. [25], where manifestation of the anomalous triangle singularity were analyzed in various processes, including a 1 ð1260Þ → f 0 ð980Þπ decay.…”

Section: Introductionmentioning

confidence: 79%

New a1(1420) state: Structure, mass, and width

2018

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“…[401] was adopted, where the possible χ cJ p and Λ * cD ( * ) threshold enhancements due to the triangle singularities were considered.…”

Section: Kinematical Effectmentioning

confidence: 99%

“…The initial single pion emission mechanism was applied to interpret the charged Z b and Z c structures [452,491]. The triangle singularities were employed to understand the Z b , Z c and P c structures [450,397,399,401,398].…”

Section: Non-resonant Schemesmentioning

confidence: 99%

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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“…The detailed discussions on the ATS region can be found in recent re-analyses [2]. In realistic calculations, the spectrum function can be calculated with the implementation of Cutkosky rule [3]:…”

Section: Anomalous Triangle Singularitymentioning

confidence: 99%

“…rescattering by exchanging a K orK satisfies the ATS condition perfectly, and even allow a broad ATS kinematic region, i.e. a range of the initial masses, to be within the physical region [2]. To be more specific, if the initial state X has a mass within the range of 1.385∼1.442 GeV, strong threshold enhancement will appear around the KK threshold in the π + π − invariant mass spectrum as shown in Fig.…”

Section: Anomalous Triangle Singularitymentioning

confidence: 99%