Precision Study of η′→γπ+π− Decay Dynamics

BESIII Collaboration, M. Ablikim, M. N. Achasov, S. Ahmed, X.C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, Z. Haddadi, N. Kalantar-Nayestanaki, M. Kavatsyuk, H. Löhner, J. Messchendorp, M. Tiemens

    Onderzoeksoutput: ArticleAcademicpeer review

    47 Citaten (Scopus)
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    Samenvatting

    Using a low background data sample of 9.7×105  J/ψ→γη′, η′→γπ+π− events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of η′→γπ+π− are studied with both model-dependent and model-independent approaches. The contributions of ω and the ρ(770)−ω interference are observed for the first time in the decays η′→γπ+π− in both approaches. Additionally, a contribution from the box anomaly or the ρ(1450) resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach.
    Originele taal-2English
    Artikelnummer242003
    Aantal pagina's8
    TijdschriftPhysical Review Letters
    Volume120
    Nummer van het tijdschrift24
    DOI's
    StatusPublished - 2018

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