Search for the Weak Decay η′ → k^± π^∓ and Precise Measurement of the Branching Fraction ℬ(J/ψ → φη′)

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Search for the Weak Decay η′ → k^± π^∓ and Precise Measurement of the Branching Fraction ℬ(J/ψ → φη′)

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Title: Search for the Weak Decay η′ → k^± π^∓ and Precise Measurement of the Branching Fraction ℬ(J/ψ → φη′)
Author(s):
Ablikim, M.;
Achasov, M. N.;
Ai, X. C.;
Albayrak, O.;
Albrecht, M.;
Ambrose, D. J.;
Amoroso, A.;
Lou, Xinchou (UT Dallas);
BESIII Collaboration
Item Type: article
Keywords: Show Keywords
Abstract: We present the first search for the rare decay of η′ into K^± π^∓ in J/ψ → φη′, using a sample of 1.3 ×10⁹ J/ψ events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90% confidence level for the ratio ℬ(η′ → K^± π^∓) / ℬ(η′ → γπ⁺π⁻) is determined to be 1.3 × 10⁻⁴. In addition, we report the measurement of the branching fraction of J/ψ → φη′ to be [5.10 ± 0.03(stat) ± 0.32(syst)] × 10⁻⁴, which agrees with previous results from BESII.
Publisher: American Physical Society
ISSN: 1550-7998 (ISSN)
Persistent Link: http://dx.doi.org/10.1103/PhysRevD.93.072008
http://hdl.handle.net/10735.1/5598
Bibliographic Citation: Ablikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2016. "Search for the weak decay η′ →k^± π^∓ and precise measurement of the branching fraction ℬ(J /ψ → φη′)." Physical Review D - Particles, Fields, Gravitation and Cosmology 93(7), doi:10.1103/PhysRevD.93.072008.
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