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.
Search for the weak decay η′ →k±π and precise measurement of the branching fraction B (J /ψ →φη′) SEARCH for the WEAK DECAY ⋯ M. ABLIKIM et al
AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, Marco Giovanni Maria;DE MORI, FRANCESCA;GRECO, Michela;HU, Jifeng;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;ZOTTI, LAURA;
2016-01-01
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.File in questo prodotto:
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