The non-ordinary Regge behavior of the $$K^*_0(800)$$ K 0 ∗ ( 800 ) or $$\kappa $$ κ -meson versus the ordinary $$K^*_0(1430)$$ K 0 ∗ ( 1430 )

Peláez, J. R.; Rodas, A.

doi:10.1140/epjc/s10052-017-4994-3

Cited by 16 publications

(11 citation statements)

References 53 publications

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“…For additional recent works on this state, see Refs. [47,48], and references therein. This similarity is interesting also in view of an important difference between the two systems: the decay of 320 a scalar kaon into two pseudoscalars is a s-wave (Γ ∼ k) while that of a vector charmonium into two pseudoscalars is a p-wave (Γ ∼ k 3 ).…”

Section: Pole Positionsmentioning

confidence: 99%

Line-shape and poles of the ψ(3770)

Coito

Giacosa

2019

Nuclear Physics A

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We study the non-Breit-Wigner line-shape of the ψ(3770) resonance, predominantly a 1 3 D 1c c state, using an unitarized effective Lagrangian approach, including the one-loop effects of the nearby thresholds D + D − and D 0D0 . A fit of the theoretical result to the total cross-section e + e − → DD is performed, leading to a good description of data (χ 2 /d.o.f. ∼ 1.03). The partial cross sections e + e − → D 0D0 and e + e − → D + D − turn out to be separately in good agreement with the experiment. We find a pole at 3777−i12 MeV, that is within the Particle Data Group (PDG) mass and width estimation for this state. Quite remarkably, we find an additional, dynamically generated, companion pole at 3741 − i19 MeV, which is responsible for the deformation on the lower energy side of the line-shape. The width for the leptonic decay ψ(3770) → e + e − is 112 eV, hence smaller than the PDG fit of 262 ± 18 eV, yet in agreement with a recent experimental study. 45 monium seed state, which gets dressed by "clouds" of D + D − and D 0D0 mesons.Our aim is to study the deformation seen on the left side of the resonance in Ref.[9] with mesonic loops combined with the nearby thresholds. To this end, we use an effective relativistic Lagrangian approach in which a single vector state ψ ≡ ψ(3770) is coupled to channels D + D − and D 0D0 , as well as to lepton 50 pairs. The propagator of ψ is calculated at the resummed one-loop level and fulfills unitarization requirements. Then, we perform a fit of the four parameters of our approach, i.e. the effective couplings of ψ to DD and of ψ to leptons, the mass of ψ, and a cutoff responsible for the finite dimension of the ψ meson, to the experimental cross-section of the reaction e + e − → DD in Refs. [7] and 55[5], in the energy region up to 100 MeV above the D 0D0 threshold. We assume that the ψ(3770) resonance dominates in this energy range. We obtain a very good description of the data, which in turn allows us to determine in a novel and independent way the mass, width, and branching ratios of the ψ(3770).Moreover, we study in detail, to our knowledge for the first time, the poles of 60 this state. In fact, a pole was found in Ref. [16], using Fano resonances, at about 3778 − i14 MeV, though in lesser detail. Quite remarkably, we find two poles for this resonance, one which roughly corresponds to the peak of the resonance, the seed pole, and one additional dynamically generated pole, responsible for the enhancement left from the peak, which emerges due to the strong coupling function, turns out to be rather small, possibly due to the fact that the ψ(3770)

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Section: Pole Positionsmentioning

confidence: 99%

Line-shape and poles of the ψ(3770)

Coito

Giacosa

2019

Nuclear Physics A

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“…These results are also in agreement with what is expected from algebraic [17,18] (α = 1.07 ± 0.02 GeV −2 ) and relativistic [20] (α 1 GeV −2 ) quark models, despite the fact that they miss dynamics [64] that are present in the actual Regge trajectories. The 1 2 ± trajectories should have (6) 5.84 (7) the same slope [1], hence once we have a robust determination from the 1 2 + (+) we can use it to benchmark and assess the parameters extracted from other trajectories. trajectory.…”

Section: A Fits and Error Analysismentioning

confidence: 99%

“…According to Regge theory, resonances appear as poles in the angular momentum plane. The pole location, which changes as a function of the resonance mass and defines the so-called Regge trajectory, can be used to study the microscopic mechanisms responsible for resonance formation [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Regge phenomenology of theNandΔpoles

et al. 2019

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We use Regge phenomenology to study the structure of the poles of the N * and ∆ * spectrum. We employ the available pole extractions from partial wave analysis of meson scattering and photoproduction data. We assess the importance of the imaginary part of the poles (widths) to obtain a consistent determination of the parameters of the Regge trajectory. We compare the several pole extractions and show how Regge phenomenology can be used to gain insight in the internal structure of baryons. We find that the majority of the states in the parent Regge trajectories are compatible with a mostly compact three-quark state picture.

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“…Besides, scenario II is also supported by a lattice calculation [43] and the recent Regge trajectory calculation [44]. Hence, we prefer to use the Gegenbauer moments B 1 ¼ −0.57 AE 0.13 at the 1 GeV scale in scenario II obtained using the QCD sum rule method [37,38].…”

Section: Frameworkmentioning

confidence: 99%

S -wave Kπ contributions to the hadronic charmonium B decays in the perturbative QCD approach

Rui

Wang

2018

Phys. Rev. D

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We extend our recent works on the two-pion S-wave resonance contributions to the kaon-pion ones in the B meson hadronic charmonium decay modes based on the perturbative QCD approach. The S-wave Kπ timelike form factor in its distribution amplitudes is described by the LASS parametrization, which consists of the K Ã 0 ð1430Þ resonant state together with an effective range nonresonant component. The predictions for the decays B → J/ψKπ in this work agree well with the experimental results from the BABAR and Belle collaborations. We also discuss theoretical uncertainties, indicating that the results of this work, which can be tested by the LHCb and Belle-II experiments, are reasonably accurate.

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The non-ordinary Regge behavior of the $$K^_0(800)$$ K 0 ∗ ( 800 ) or $$\kappa $$ κ -meson versus the ordinary $$K^_0(1430)$$ K 0 ∗ ( 1430 )

Cited by 16 publications

References 53 publications

Line-shape and poles of the ψ(3770)

Line-shape and poles of the ψ(3770)

Regge phenomenology of theNandΔpoles

S -wave Kπ contributions to the hadronic charmonium B decays in the perturbative QCD approach

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The non-ordinary Regge behavior of the $$K^*_0(800)$$ K 0 ∗ ( 800 ) or $$\kappa $$ κ -meson versus the ordinary $$K^*_0(1430)$$ K 0 ∗ ( 1430 )

Cited by 16 publications

References 53 publications

Line-shape and poles of the ψ(3770)

Line-shape and poles of the ψ(3770)

Regge phenomenology of theN*andΔ*poles

S -wave Kπ contributions to the hadronic charmonium B decays in the perturbative QCD approach

Contact Info

Product

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The non-ordinary Regge behavior of the $$K^_0(800)$$ K 0 ∗ ( 800 ) or $$\kappa $$ κ -meson versus the ordinary $$K^_0(1430)$$ K 0 ∗ ( 1430 )

Regge phenomenology of theNandΔpoles