Study of the process e+e−→ωπ0→π0π0γ in c.m. energy range 920–1380 MeV at CMD-2

Akhmetshin, R.R.; Aulchenko, V.; Banzarov, V.Sh.; Baratt, A.; Барков, Л.М.; Baru, S.E.; Bashtovoy, N.S.; Bondar, A.; Bondarev, D.V.; Bragin, A.V.; Eidelman, S.; Epifanov, D.; Fedotovitch, G.V.; Gabyshev, N.; Gorbachev, D.A.; Grebeniuk, A.A.; Grigoriev, D.N.; Hughes, V. W.; Ignatov, F.V.; Karpov, S. V.; Казанин, В. Ф.; Khazin, B. I.; Koop, I. A.; Krokovny, P.; Kuzmin, A.; Logashenko, I.B.; Lukin, P.; Лысенко, А. П.; Mikhailov, K.; Milstein, A. I.; Nesterenko, I.N.; Okhapkin, V.S.; Otboev, A.V.; Pak, Alexey; Perevedentsev, E. A.; Polunin, A.A.; Попов, А. С.; Redin, S. I.; Roberts, B. L.; Root, N.; Рубан, А.А.; Ryskulov, N.M.; Shamov, A.G.; Shatunov, Yu. M.; Shwartz, B.; Sibidanov, A.; Sidorov, V.; Skrinsky, A.N.; Snopkov, I.G.; Solodov, E. P.; Stepanov, P.Yu.; Thompson, J.; Valishev, Alexander; Yudin, Yu.V.; Zaitsev, A.; Zverev, S.G.

doi:10.1016/s0370-2693(03)00595-1

Cited by 68 publications

(49 citation statements)

References 33 publications

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“…[13]. This value is consistent with the experimental values derived from ω → π 0 γ, ρ → π 0 γ and ω → ρπ → π + π − π 0 decays, and theoretical estimates based on the QCD sum rules [14,15,16].…”

Section: A I = 1 Transitions In Vmd Modelsupporting

confidence: 89%

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Study of isospin violating φ excitation ine⁺e⁻→ ωπ⁰

Zhang

Zhao

2009

J. Phys. G: Nucl. Part. Phys.

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We study the reaction e + e − → ωπ 0 in the vicinity of φ mass region. The isospin-violating φ excitation is accounted for by two major mechanisms. One is electromagnetic (EM) transition and the other is strong isospin violations. For the latter, we consider contributions from the intermediate hadronic meson loops and φ-ρ 0 mixing as the major mechanisms via the t and s-channel transitions, respectively. By fitting the recent KLOE data, we succeed in constraining the model parameters and extracting the φ → ωπ 0 branching ratio. It shows that the branching ratio is sensitive to the φ excitation line shape and background contributions. Some crucial insights into the correlation between isospin violation and Okubo-Zweig-Iizuka (OZI) rule evading transitions are also learned.

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Section: A I = 1 Transitions In Vmd Modelsupporting

confidence: 89%

“…Γ ρ (s) and Γ ρ ′ (s) are energy-dependent total widths for the intermediate ρ and ρ ′ , respectively. They are described by the two major decay modes, π + π − and ωπ 0 [13]:…”

Section: A I = 1 Transitions In Vmd Modelmentioning

confidence: 99%

Study of isospin violating φ excitation ine⁺e⁻→ ωπ⁰

Zhang

Zhao

2009

J. Phys. G: Nucl. Part. Phys.

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“…It is the most accurate measurement of this cross section between 1.4 and 2.0 GeV. SND data agree with the earlier measurements performed at the VEPP-2M collider with the SND [16] and CMD-2 [17] detectors below 1.4 GeV. Significant disagreement with DM2 data [18] is observed in the energy range 1.3-2.0 GeV.…”

Section: Icnfp 2013supporting

confidence: 86%

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Ачасов

Akhmetshin

Anisenkov

et al. 2014

EPJ Web of Conferences

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Abstract. It's good known the difference in 3.5 sigma between the muon (g − 2) experimental result and its calculation in Standard Model. To clarify this intriguing discrepancy the new stage of muon (g − 2) measurement is under preparation at Fermi National Laboratory. On other hand, regular data taking for measurements of hadron cross section production in e + e − annihilations is under way since December 2010 at the electron-positron collider VEPP-2000 with the CMD-3 and SND detectors. The collected data sample corresponds to about 60 inverse picobarns of integrated luminosity per detector in the energy range from 0.32 up to 2 GeV. Preliminary analysis of various hadronic cross sections has been performed. a

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“…The resulting number of events is divided by the ISR luminosity in each mass region, yielding the cross section σðe þ e − → ωπ 0 γ → π þ π − 2π 0 γÞ as a function of the CM energy of the hadronic system listed in Table III and shown in Fig. 13 in comparison to existing data [41][42][43][44]. In this case, possible background processes are removed by the fit function.…”

Section: Intermediate Resonancesmentioning

confidence: 99%

Measurement of the e+e−→π+π−π0π0 cross section using initial

Lees¹,

Poireau²,

Tisserand³

et al. 2017

Phys. Rev. D

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The process e þ e − → π þ π − 2π 0 γ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using 454.3 fb −1 of data collected around a centerof-mass energy of ffiffi ffi s p ¼ 10.58 GeV by the BABAR experiment at SLAC, approximately 150000 signal events are obtained. The corresponding nonradiative cross section is measured with a relative uncertainty of 3.6% in the energy region around 1.5 GeV, surpassing all existing measurements in precision. Using this new result, the channel's contribution to the leading order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is calculated as ðg π þ π − 2π 0 μ − 2Þ=2 ¼ ð17.9 AE 0.1 stat AE 0.6 syst Þ × 10 −10 in the energy range 0.85 GeV < E CM < 1.8 GeV. In the same energy range, the impact on the running of the fine-structure constant at the Z 0 -pole is determined as Δα π þ π − 2π 0 ðM 2 Z Þ ¼ ð4.44 AE 0.02 stat AE 0.14 syst Þ × 10 −4 . Furthermore, intermediate resonances are studied and especially the cross section of the process e þ e − → ωπ 0 → π þ π − 2π 0 is measured.

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Study of the process e+e−→ωπ0→π0π0γ in c.m. energy range 920–1380 MeV at CMD-2

Cited by 68 publications

References 33 publications

Study of isospin violating φ excitation ine⁺e⁻→ ωπ⁰

Study of isospin violating φ excitation ine⁺e⁻→ ωπ⁰

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

Measurement of the e+e−→π+π−π0π0 cross section using initial

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Study of the process e+e−→ωπ0→π0π0γ in c.m. energy range 920–1380 MeV at CMD-2

Cited by 68 publications

References 33 publications

Study of isospin violating φ excitation ine+e−→ ωπ0

Study of isospin violating φ excitation ine+e−→ ωπ0

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e+e−collider

Measurement of the e+e−→π+π−π0π0 cross section using initial

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Study of isospin violating φ excitation ine⁺e⁻→ ωπ⁰

Study of isospin violating φ excitation ine⁺e⁻→ ωπ⁰

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider