η, $ \eta{^\prime}$ → πl+l- in a chiral unitary approach

Borasoy, B.; Nißler, Robert

doi:10.1140/epja/i2007-10396-3

Cited by 44 publications

(42 citation statements)

References 29 publications

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“…The electron-positron invariant mass distribution provides information about the intrinsic structure of the η ′ meson and the momentum dependence of the transition form factor. Recently, BESIII reported the measurement of η ′ → π + π − e + e − [3], which is found to be dominated by η ′ →ρe + e − , in agreement with theoretical predictions [2,4].…”

Section: Introductionsupporting

confidence: 74%

Observation ofη′→ωe+e−

Ablikim¹,

Ачасов²,

Ai³

et al. 2015

Phys. Rev. D

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Based on a sample of η ′ mesons produced in the radiative decay J/ψ → γη ′ in 1.31 × 10 9 J/ψ events collected with the BESIII detector, the decay η ′ → ωe + e − is observed for the first time, with a statistical significance of 8σ. The branching fraction is measured to be B(η ′ → ωe + e − ) = (1.97 ± 0.34(stat) ± 0.17(syst)) × 10 −4 , which is in agreement with theoretical predictions. The branching fraction of η ′ → ωγ is also measured to be (2.55 ± 0.03(stat) ± 0.16(syst)) × 10 −2 , which is the most precise measurement to date, and the relative branching fractionis determined to be (7.71 ± 1.34(stat) ± 0.54(syst)) × 10 −3 .

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Section: Introductionsupporting

confidence: 74%

Observation ofη′→ωe+e−

Ablikim¹,

Ачасов²,

Ai³

et al. 2015

Phys. Rev. D

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“…The e + e − invariant mass distribution will provide us useful information on the internal structure of the η meson and the momentum dependence of the transition form factor. In 2013, BESIII reported the measurement of η → π + π − e + e − [9], which is found to be dominated by η → ρe + e − , and the results are in agreement with the theoretical predictions [35,36]. More recently, the branching fraction B(η → ωe + e − ) = [1.97±0.34±0.17]×10 −4 was reported for the first time via J/ψ radiative decays [13], and is also consistent with the theoretical predictions [35,37].…”

Section: η/η →γπsupporting

confidence: 66%

Event generators for ${{\eta }}/{{{\eta }}}^{^{\prime} }$ decays at BESIII

et al. 2018

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The light unflavoured meson η/η decays are valuable for testing non-perturbative quantum chromodynamics and exploring new physics beyond the Standard Model. This paper describes a series of event generators, including η/η → γl, which have been developed for investigating η/η decay dynamics. For most of these generators, their usability has been validated in BESIII analyses for determining the detection efficiency, and background studies. The consistency between data and Monte Carlo shows that these generators work well in the BESIII simulation, and will also be useful for ongoing BESIII analyses and other experiments for studying η/η physics.

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“…4. These decays probe the structure of the η meson [25] and test the theoretical predictions of the branching ratio [39][40][41][42]. Moreover, the π + π − e + e − final state could reveal CP violation beyond the prediction of the Standard Model by measuring the angular asymmetry A φ between pions and electrons decay planes [43].…”

Section: Perspectives From E + E − Interactions With Kloe-2 Datamentioning

confidence: 77%