Strong and radiative decays of excited vector mesons and predictions for a new 
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 resonance

Piotrowska, Milena; Reisinger, Christian; Giacosa, Francesco

doi:10.1103/physrevd.96.054033

Cited by 37 publications

(41 citation statements)

References 92 publications

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“…Except t quark, the other quarks can form mesons, baryons ,and other hadrons. As an important part of hadron, the meson family is phenomenologically studied by many works [1][2][3][4][5][6][7][8][9]. When checking the experimental status of mesons [10], we notice an interesting phenomenon, the whole meson family with J PC = 5 ++ (with qq component, here q defines u, d, or s quark) is still missing, yet the other families for a and f meson (such as a 0 , a 1 , a 2 , a 3 , a 4 , and a 6 ) have been reported by Particle Data Group(PDG) [10].…”

Section: Introductionmentioning

confidence: 99%

Prediction for 5++ mesons

Pang

Wang

2019

Phys. Rev. D

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In this paper, we study the spectrum and decay behavior of 5 ++ meson family which is still missing in experiment. By the modified Godfrey-Isgur model with a color screening effect, we obtain the mass spectrum of a 5 , f 5 and f ′ 5 mesons. And we predict their two-body strong decays by means of a phenomenology quark pair creation model. This study is crucial to establish J PC = 5 ++ meson family and it is also helpful to search for these states in the future.

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Section: Introductionmentioning

confidence: 99%

Prediction for 5++ mesons

Pang

Wang

2019

Phys. Rev. D

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“…Estimations for the ψ(3770) production via pp annihilation are made in [23,24,25], which may possibly be measured at the PANDA experiment [26]. 40 Mass estimations for the ψ(3770) have also been made on the lattice [27,28].…”

Section: Introductionmentioning

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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“…The P μ 's have J PC ¼ 1 þ− and may be the b 1 ð1235Þ, K 1;B , h 1 ð1170Þ, and h 1 ð1380Þ; in the quark model, they have 2Sþ1 L J ¼ 1 P 1 . The S μ 's, with J PC ¼ 1 −− , may be the ρð1700Þ, K Ã ð1680Þ, ωð1650Þ, and an excited ϕð?Þ [49]; in the quark model, they have…”

Section: Heterochiral Vectorsmentioning

confidence: 99%

How the axial anomaly controls flavor mixing among mesons

2018

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It is well known that, because of the axial anomaly in QCD, mesons with J P ¼ 0 − are close to SUð3Þ V eigenstates; the η 0 ð958Þ meson is largely a singlet, and the η meson an octet. In contrast, states with J P ¼ 1 − are flavor diagonal; e.g., the ϕð1020Þ is almost puress. Using effective Lagrangians, we show how this generalizes to states with higher spin, assuming that they can be classified according to the unbroken chiral symmetry of G fl ¼ SUð3Þ L × SUð3Þ R . We construct effective Lagrangians from terms invariant under G fl and introduce the concept of hetero-and homochiral multiplets. Because of the axial anomaly, only terms invariant under the Zð3Þ A subgroup of the axial Uð1Þ A enter. For heterochiral multiplets, which begin with that including the η and η 0 ð958Þ, there are Zð3Þ A invariant terms with low mass dimension which cause states to mix according to SUð3Þ V flavor. For homochiral multiplets, which begin with that including the ϕð1020Þ, there are no Zð3Þ A invariant terms with low mass dimension, and so states are diagonal in flavor.In this way, we predict the flavor mixing for the heterochiral multiplet with spin 1 as well as for hetero-and homochiral multiplets with spin 2 and spin 3.

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Strong and radiative decays of excited vector mesons and predictions for a new ϕ(1930) resonance

Abstract: We study the phenomenology of two nonets of excited vector mesons, {ρ

Cited by 37 publications

References 92 publications

Prediction for 5++ mesons

Prediction for 5++ mesons

Line-shape and poles of the ψ(3770)

How the axial anomaly controls flavor mixing among mesons

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