Radiative decays of heavy quarkonia in an extended vector-dominance model

Intemann, Gerald W.

doi:10.1103/physrevd.27.2755

Cited by 22 publications

(13 citation statements)

References 13 publications

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“…It should be also noted that phenomenological models can have compatible predictions. In an extended vector-dominance model one indeed finds the branching ratio from 5.3 × 10 −7 to 2.5 × 10 −6 [9], but this model has no direct relation to QCD as the fundamental theory of strong interaction.…”

mentioning

confidence: 98%

Reexamining radiative decays of1−−quarkonium intoη′and η

2002

Phys. Rev. D

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Recently CLEO has studied the radiative decay of Υ into η ′ and an upper limit for the decay has been determined. Confronting with this upper limit, most of theoretical predictions for the decay fails. After briefly reviewing these predictions we re-examine the decay by separating nonperturbative effect related to the quarkonium and that related to η ′ or η, in which the later is parameterized by distribution amplitudes of gluons in η ′ . With this factorization approach we obtain theoretical predictions which are in agreement with experiment. Uncertainties in our predictions are discussed. The possibly largest uncertainties are from relativistic corrections for J/Ψ and the value of the charm quark mass. We argue that the effect of these uncertainties can be reduced by using quarkonium masses instead of using quark masses. An example of the reduction is shown with an attempt to explain the violation of the famous 14% rule in radiative decays of charmonia.

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confidence: 98%

Reexamining radiative decays of1−−quarkonium intoη′and η

2002

Phys. Rev. D

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“…This process is important for testing various phenomenological mechanisms, including Vector Meson Dominance [32,33,34], η c − η mixing [35,36], two gluon couplings to qq states [33], and final state radiation by light quarks [32]. The value of R J/ψ = B(J/ψ→γη) B(J/ψ→γη ) is predicted in first order perturbation theory [32], and R ψ =…”

Section: ψ → γPmentioning

confidence: 99%

Recent Results from BES3

Harris¹

2011

Proceedings of XLIX International Winter Meeting on Nuclear Physics — PoS(Bormio 2011)

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The BEPCII collider operates in the tau-charm center of mass energy region from 2 GeV to 4.6 GeV with a design luminosity of 1 × 10 33 cm −2 s −1 . Samples of 106 M ψ events and 225 M J/ψ events were recorded by the BESIII detector in the summer of 2009. Results based on these samples are described, including h c studies, measurements of χ cJ decays, confirmations of the BESII X(1660) and X(1835) resonances, f 0 (980) − a 0 (980) mixing signals, and ψ → γP(P = π 0 , η, η ) . Also described are the BESIII beam energy measurement system, which will be important for an improved tau mass measurement, and the future BESIII program.

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“…Baier and Grozin [9] showed that for light vector mesons (such as J/ψ) there might be an additional "anomaly" diagram that contributes significantly to the radiative decays. Noting that VDM has no direct relation to QCD as the fundamental theory of strong interactions, and referring to [7], Ma tries to address the problem by using factorization at tree level with NRQCD matrix elements to describe the heavy vector meson portion multiplied by a set of twist-2 and twist-3 gluonic distribution amplitudes [10].…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have tried to explain the lack of signals in radiative Υ(1S) decays into pseudoscalar mesons, using a variety of models which produce branching fraction predictions of 10 −6 to 10 −4 . Employing the Vector Meson Dominance Model (VDM), Intemann [7] predicts the branching fractions for the heavy vector meson radiative decay into light pseudoscalar mesons. Using the mixing mechanism of η, η ′ with the as-yet-unobserved pseudoscalar resonance η b , Chao [8] first calculated the mixing angle λ ηη b in order to estimate the radiative branching fractions.…”

Section: Introductionmentioning

confidence: 99%

Search for radiative decays ofΥ(1S)intoηandη′

Athar¹,

Patel²,

Potlia³

et al. 2007

Phys. Rev. D

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We report on a search for the radiative decay of Υ(1S) to the pseudoscalar mesons η and η ′ in (21.2 ± 0.2) × 10 6 Υ(1S) decays collected with the CLEO III detector at the Cornell Electron Storage Ring (CESR). The η meson was reconstructed in the three modes η → γγ, η → π + π − π 0 or η → π 0 π 0 π 0 . The η ′ meson was reconstructed in the mode η ′ → π + π − η with η decaying through any of the above three modes, and also η ′ → γρ 0 , whereFive out of the seven sub-modes are found to be virtually background-free. In four of them we find no signal candidates and in one (there are two good signal candidates, which is insufficient evidence to claim a signal. The other two sub-modes (η → γγ and η ′ → γρ 0 ) are background limited, and show no excess of events in their signal regions. We combine the results from different channels and obtain upper limits at the 90% C.L. which are B(Υ(1S) → γη) < 1.0 × 10 −6 and B(Υ(1S) → γη ′ ) < 1.9 × 10 −6 . Our limits are an order of magnitude tighter than the previous ones and below the predictions made by some theoretical models.2

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Radiative decays of heavy quarkonia in an extended vector-dominance model

Cited by 22 publications

References 13 publications

Reexamining radiative decays of1−−quarkonium intoη′and η

Reexamining radiative decays of1−−quarkonium intoη′and η

Recent Results from BES3

Search for radiative decays ofΥ(1S)intoηandη′

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