Study of the φ decays into π0π0γ and ηπ0γ final states

Akhmetshin, R.R.; Anashkin, E.; Arpagaus, M.; Aulchenko, V.; Banzarov, V.Sh.; Барков, Л.М.; Bashtovoy, N.S.; Bondar, A.; Bondarev, D.V.; Bragin, A.V.; Chernyak, D.V.; Dvoretsky, A.S.; Eidelman, S.; Федотович, Г. В.; Gabyshev, N.; Grebeniuk, A.A.; Grigoriev, D.N.; Ivanov, P.M.; Karpov, S. V.; Казанин, В. Ф.; Khazin, B. I.; Koop, I. A.; Krokovny, P.; Kurdadze, L.M.; Kuzmin, A.; Logashenko, I.B.; Lukin, P.; Лысенко, А. П.; Mikhailov, K.; Nesterenko, I.N.; Okhapkin, V.S.; Perevedentsev, E. A.; Panich, E.A.; Popov, A.; Purlatz, T.A.; Root, N.; Рубан, А.А.; Ryskulov, N.M.; Shamov, A.G.; Shatunov, Yu. M.; Shwartz, B.; Sibidanov, A.; Sidorov, V.; Skrinsky, A.N.; Smakhtin, V.; Snopkov, I.G.; Solodov, E. P.; Stepanov, P.Yu.; Суханов, А.; Титов, В.М.; Yudin, Yu.V.; Zverev, S.G.; Thompson, J.

doi:10.1016/s0370-2693(99)00920-x

Cited by 123 publications

(69 citation statements)

References 18 publications

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“…In the last decade the idea that this resonance, as well as the other light scalar resonances, a 0 (980), f 0 (600) or κ(800), are dynamically generated from multiple scattering using the ordinary chiral Lagrangians [15,16,17,18] has shed new light into the problem of the nature of the scalar mesons. From the experimental point of view, both the CM2 collaboration at Novosibirsk [19] and the KLOE collaboration of the φ factory DAΦNE at Frascati [20] reported results on the two pion invariant mass distribution in the φ → π 0 π 0 γ decay. The φ meson is produced from electronpositron collision.…”

Section: Introductionmentioning

confidence: 99%

Asymmetry observables ine+e−→π+π−γin theϕregion within a chiral unitar

2010

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We make a theoretical study of the charge and forward-backward pion asymmetries in the e + e − → π + π − γ process on and off the φ resonance energy. These observables are rather sensitive to the inner details of the theoretical models to describe the reaction. In addition to the standard implementation of the initial state radiation (ISR) and the Bremsstrahlung contribution to the final state radiation (FSR), we use the techniques of the chiral unitary approach to evaluate the contribution from the mechanisms of φ decay into π + π − γ. This contribution involves the implementation of final state interaction from direct chiral loops, the exchange of vector and axial-vector resonances and the final state interaction through the consideration of the meson-meson unitarized amplitudes, which where found important in a previous work describing the φ → ππγ. We find a good reproduction of the experimental data from KLOE for the forward-backward asymmetry, both at the φ peak and away from it. We also make predictions for the angular distributions of the charge asymmetry and show that this observable is very sensitive to the chiral loops involved in φ radiative decay.PACS numbers:

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Section: Introductionmentioning

confidence: 99%

Asymmetry observables ine+e−→π+π−γin theϕregion within a chiral unitar

2010

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“…For the branching ratio they obtain B(φ → π 0 π 0 γ) = (1.22 ± 0.12) × 10 −4 [1] and (0.92 ± 0.10) × 10 −4 [2], for m ππ > 700 MeV in the latter case. More recently, the KLOE Collaboration has measured B(φ → π 0 π 0 γ) = (1.09 ± 0.06) × 10 −4 [3].…”

Section: Experimental Datamentioning

confidence: 92%

“…To appear in the proceedings of the QCD 02 High-Energy Physics International Conference in Quantum Chromodynamics, 2-9th July 2002 Montpellier (France). 10 −5 [2], and B(φ → π 0 ηγ) = (8.51 ± 0.76) × 10 −5 (η → γγ) and (7.96 ± 0.72) × 10 −5 (η → π + π − π 0 ) [5]. Again, in all the cases, the observed mass spectrum shows a significant enhancement at large π 0 η invariant mass that is interpreted as a manifestation of the dominant contribution of the a 0 (980)γ intermediate state.…”

Section: Experimental Datamentioning

confidence: 99%

Scalar meson exchange in V → P0P0γ decays

Escribano

2003

Nuclear Physics B - Proceedings Supplements

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“…For the branching ratio they obtain B(φ → π 0 π 0 γ) = (1.221 ± 0.098 ± 0.061) × 10 −4 [1] and (1.08 ± 0.17 ± 0.09) × 10 −4 [2]. More recently, the KLOE Collaboration has measured B(φ → π 0 π 0 γ) = (1.09 ± 0.03 ± 0.05) × 10 −4 [3].…”

Section: Experimental Datamentioning

confidence: 99%

“…For φ → π 0 ηγ, the branching ratios measured by the SND, CMD-2 and KLOE Collaborations are B(φ → π 0 ηγ) = (8.8 ± 1.4 ± 0.9) × 10 −5 [4], (9.0 ± 2.4 ± 1.0) × 10 −5 [2], and B(φ → π 0 ηγ) = (8.51 ± 0.51 ± 0.57) × 10 −5 (η → γγ) and (7.96 ± 0.60 ± 0.40) × 10 −5 (η → π + π − π 0 ) [5]. Again, in all these cases, the observed mass spectrum shows a significant enhancement at large π 0 η invariant mass that is interpreted as a manifestation of the dominant contribution of the a 0 (980)γ intermediate state.…”

Section: Experimental Datamentioning

confidence: 99%

Scalar meson exchange in θ → P0P0γ decays

Escribano

2004

Nuclear Physics B - Proceedings Supplements

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The scalar meson exchange in φ → P 0 P 0 γ decays is discussed in a chiral invariant framework where the scalar meson poles are incorporated explicitly. φ → π 0 π 0 γ and φ → π 0 ηγ are in agreement with recent experimental data and can be used to extract valuable information on the properties of f0 (980) and a0(980) respectively. φ → K 0K 0 γ is shown not to pose a background problem for testing CP violation at DaΦne. The ratio φ → f0γ/a0γ is also predicted.

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Study of the φ decays into π0π0γ and ηπ0γ final states

Cited by 123 publications

References 18 publications

Asymmetry observables ine+e−→π+π−γin theϕregion within a chiral unitar

Asymmetry observables ine+e−→π+π−γin theϕregion within a chiral unitar

Scalar meson exchange in V → P0P0γ decays

Scalar meson exchange in θ → P0P0γ decays

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