The decay ρ0→π0π0γ and the role of σ-meson

Gökalp, A.; Yılmaz, O.

doi:10.1016/s0370-2693(01)00311-2

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…The integrated branching ratio obtained, B ! 0 0 LMVMD 4:2 10 ÿ5 , is in perfect agreement with the new experimental results [12,13] (confirming the older measurement [14]) and previous analyses [22,27,29,30,61]. The scalar part alone amounts to B !…”

Section: E ! 0supporting

confidence: 89%

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Scalar and vector meson exchange inV→P0P0γdecays

Escribano

2006

Phys. Rev. D

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The scalar contributions to the radiative decays of light vector mesons into a pair of neutral pseudoscalars, V ! P 0 P 0 , are studied within the framework of the linear sigma model. This model has the advantage of incorporating not only the scalar resonances in an explicit way but also the constraints required by chiral symmetry. The experimental data on ! 0 0 , ! 0 , ! 0 0 , and ! ! 0 0 are satisfactorily accommodated in our framework. Theoretical predictions for ! K 0 K 0 , ! 0 , ! ! 0 , and the ratio ! f 0 =a 0 are also given.

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Section: E ! 0supporting

confidence: 89%

“…A third model that makes use of the characteristics of the two former formalisms is developed in Refs. [21][22][23][24][25][26][27]. The previous three models include the scalar resonances ad hoc, i.e.…”

Section: Introductionmentioning

confidence: 99%

Scalar and vector meson exchange inV→P0P0γdecays

Escribano

2006

Phys. Rev. D

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“…The initial calculation of the σ meson contribution using direct ρσγ coupling [13,14] however overestimates the measured Γ(ρ → π 0 π 0 γ) by two orders of magnitude. This unrealistic result is later ascribed [15,16] to the large and momentum-independent ρσγ coupling (g ρσγ ≈ 2.2 ∼ 3.2) determined from the analyses of ρ meson photoproduction near threshold [17,18] or by QCD sum rules [19,20].…”

Section: Introductionmentioning

confidence: 91%

“…2 Note that the vertex (14) can also be applied to the f 2 → γγ decay. If we apply the vector meson dominance once more to the relation (16), we have f f γγ = 0 and g f γγ = e 2 1/f 2…”

Section: B Intermediate Tensor Mesonmentioning

confidence: 99%

Higher meson resonances inρ→π0π0γ
Oh
¹
,
Kim
²

2003
Phys. Rev. D
10
3
2
0
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The role of higher meson resonances with spin 1 and 2 is investigated quantitatively in the decay processes of ρ → π 0 π 0 γ and ω → π 0 π 0 γ. Among the higher resonances, we find that the f 2 (1270) tensor meson can give a nontrivial contribution especially to the ω → π 0 π 0 γ decay process. When the f 2 contribution is combined with the processes involving the vector and scalar meson intermediate states, a good agreement with the recent measurements is achieved for both decays. The effect of the f 2 (1270) is found to be sizable at the intermediate photon energies and may be verified by precise measurements of the recoil photon spectrum of the ω → π 0 π 0 γ decay. The dependence of the decay widths on various models for the ρ-ω mixing in the literature is also investigated.

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“…In practice, the product of the coupling constants g ρσγ g σN N of this tree-diagram is adjusted to fit the cross section data of ρ photoproduction at low energies. If we use g 2 σN N /4π ∼ 8 from Bonn potential [23], we then find that the resulting g ρσγ will yield a decay width of ρ 0 → σγ an order of magnitude larger than the value extracted from the recent experimental decay width of ρ 0 → π 0 π 0 γ [24][25][26]. Thus the dynamical interpretation of the commonly used σ meson exchange model for ρ meson photoproduction must be further examined theoretically.…”

Section: Introductionmentioning

confidence: 93%

ρmeson photoproduction at low energies

Lee

2004

Phys. Rev. C

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The σ-exchange and f 2 -exchange mechanisms for ρ meson photoproduction are re-examined. Then the commonly employed σ-exchange amplitude is revised by using the recent information from the analyses on the ρ → π 0 π 0 γ decay and the σN N coupling constant from Bonn potential. Instead of relying on the Pomeron-f proportionality assumption, the f 2 meson exchange amplitude is established from an effective Lagrangian which is constructed from the tensor structure of the f 2 meson. Phenomenological information together with tensor meson dominance and vector meson dominance assumptions are used to estimate the f 2 coupling constants. As a first step to improve the current theoretical models, we have also explored the effects due to the un-correlated 2π exchange amplitude with πN intermediate state. This leading-order 2π exchange amplitude can be calculated using the coupling constants determined from the study of pion photoproduction and the empirical width of ρ → ππ decay. In comparing with the existing differential cross section data, we find that a model with the constructed 2π, σ, and f 2 exchanges is comparable to the commonly used σ exchange model in which the σ coupling parameters are simply adjusted to fit the experimental data. We suggest that experimental verifications of the predicted single and double spin asymmetries in the small |t| (< 2 GeV 2 ) region will be useful for distinguishing the two models and improving our understanding of the non-resonant amplitude of ρ photoproduction. Possible further improvements of the model are discussed.

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The decay ρ0→π0π0γ and the role of σ-meson

Cited by 12 publications

References 17 publications

Scalar and vector meson exchange inV→P0P0γdecays

Scalar and vector meson exchange inV→P0P0γdecays

Higher meson resonances inρ→π0π0γ
Oh
¹
,
Kim
²

2003
Phys. Rev. D
10
3
2
0
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ρmeson photoproduction at low energies

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The decay ρ0→π0π0γ and the role of σ-meson

Cited by 12 publications

References 17 publications

Scalar and vector meson exchange inV→P0P0γdecays

Scalar and vector meson exchange inV→P0P0γdecays

Higher meson resonances inρ→π0π0γOh1, Kim2 2003Phys. Rev. D10320View full textAdd to dashboardCite

ρmeson photoproduction at low energies

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About

Higher meson resonances inρ→π0π0γ
Oh
¹
,
Kim
²

2003
Phys. Rev. D
10
3
2
0
View full text Add to dashboard Cite