Observation of the conversion decay φ→π0e+e− at CMD-2

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.; Eidelman, S.; Fedotovitch, G.V.; Gabyshev, N.; Grebeniuk, A.A.; Grigoriev, D.N.; Hughes, V. W.; Ignatov, F.V.; Ivanov, P.M.; Karpov, S. V.; Казанин, В. Ф.; Khazin, B. I.; Koop, I. A.; Krokovny, P.; Kurdadze, L.M.; Kuzmin, A.; Lechner, M.; Logashenko, I.B.; Lukin, P.; Mikhailov, K.; Nesterenko, I.N.; Okhapkin, V.S.; Otboev, A.V.; Perevedentsev, E. A.; Попов, А. С.; 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.; Thompson, J.; Титов, В.М.; Valishev, Alexander; Yudin, Yu.V.; Zverev, S.G.

doi:10.1016/s0370-2693(00)01357-5

Cited by 12 publications

(11 citation statements)

References 14 publications

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“…At present, the existing data on φ → π 0 e + e − come from SND [8] and CMD-2 [9] experiments which were able to extract only the value of the Branching Ratio (BR). The F φ π 0 (q 2 ) TFF hence, was never measured so far.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the ϕ → π 0 e + e − transition form factor with the KLOE detector

Anastasi¹,

Babusci²,

Bencivenni³

et al. 2016

Physics Letters B

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A measurement of the vector to pseudoscalar conversion decay φ → π 0 e + e − with the KLOE experiment is presented. A sample of ∼ 9500 signal events was selected from a data set of 1.7 fb −1 of e + e − collisions at √ s ∼ m φ collected at the DAΦNE e + e − collider. These events were used to perform the first measurement of the transition form factor |F φπ 0 (q 2 )| and a new measurement of the branching ratio of the decay: BR (φ → π 0 e + e − ) = ( 1.35 ± 0.05 +0.05 −0.10 ) × 10 −5 . The result improves significantly on previous measurements and is in agreement with theoretical predictions.

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Section: Introductionmentioning

confidence: 99%

Measurement of the ϕ → π 0 e + e − transition form factor with the KLOE detector

Anastasi¹,

Babusci²,

Bencivenni³

et al. 2016

Physics Letters B

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“…However, this very range is of main interest for a study of the transition form factor. Therefore, for the latter a special set of selection criteria including a technique of e/π separation [9,17] was applied to suppress the main background from 3π events.…”

Section: Discussionmentioning

confidence: 99%

“…Since the previously used selection criteria leave events with small q 2 only and the detection efficiency strongly depends on M inv (e + e − ), the cuts on total momentum, angle between the total momentum of tracks and photons, M inv (e + e − γ 1 ) were omitted and the cut on ∆ψ was increased up to 2.5 radians. To suppress background mainly originating from ω → π + π − π 0 , the kinematic fit requiring energy-momentum conservation and the procedure of e/π separation based on the energy deposition of charged particles in calorimeters [9,17] were additionally used.…”

Section: Study Of the ωπ Transition Form Factormentioning

confidence: 99%

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Study of the ρ and ω meson decays into a pseudoscalar meson and e+e− pair with the CMD-2 detector

et al. 2005

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“…In this note, we focus our study on the decay channel φ → ηe + e − , with η → 3π 0 . The only existing data on φ → ηe + e − come from the SND [4] and CMD-2 [5] experiments. Their BR( φ → ηe + e − ) measurements are (1.19±0.31)×10 −4 and (1.14±0.16)×10 −4 respectively.…”

Section: Introductionmentioning

confidence: 99%

Meson transition form factors at KLOE/KLOE-2

Sarra

2014

EPJ Web of Conferences

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Abstract.In this work we present a study of the Dalitz decay φ → ηe + e − , with η → π 0 π 0 π 0 , performed using 1.7 fb −1 of e + e − collisions collected at KLOE in the 2004-2005 data taking period.The resulting branching fraction is: BR( φ → ηe + e − ) = (1.059 ± 0.007(stat.) ± 0.038(norm.)) × 10 −4 . We have also studied the invariant mass of the dilepton system, extracting the slope of the transition form factor: b φη = (1.17 ± 0.10) GeV −2 . The φ → π 0 e + e − rare decay is also being studied using the same data sample. The branching ratio will be measured, with a consistent reduction of the actual total uncertainty. The double off shell π 0 Transition Form Factor will also be measured for the first time in the time-like region, with the momentum transfer given by the e + e − invariant mass.

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Observation of the conversion decay φ→π0e+e− at CMD-2

Abstract: Using 15.1 pb −1 of data collected by CMD-2 in the φ-meson energy range, the branching ratio of the conversion decay φ → π 0 e + e − has been measured for the first time:B(φ → π 0 e + e − ) = (1.22 ± 0.34 ± 0.21) · 10 −5 .

Cited by 12 publications

References 14 publications

Measurement of the ϕ → π 0 e + e − transition form factor with the KLOE detector

Measurement of the ϕ → π 0 e + e − transition form factor with the KLOE detector

Study of the ρ and ω meson decays into a pseudoscalar meson and e+e− pair with the CMD-2 detector

Meson transition form factors at KLOE/KLOE-2

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