Using a data sample of 1.31×109 J/ψ events accumulated with the BESIII detector, the decay J/ψ→p¯pϕ is studied via two decay modes, ϕ→K0SK0L and ϕ→K+K−. The branching fraction of J/ψ→p¯pϕ is measured to be B(J/ψ→p¯pϕ)=[5.23±0.06(stat)±0.33(syst)]×10−5, which agrees well with a previously published measurement, but with a significantly improved precision. No evident enhancement near the p¯p mass threshold, denoted as X(p¯p), is observed, and the upper limit on the branching fraction of J/ψ→X(p¯p)ϕ→p¯pϕ is determined to be B(J/ψ→X(p¯p)ϕ→p¯pϕ)<2.1×10−7 at the 90% confidence level.
Study of J /ψ →p p φ at BESIII STUDY of J /ψ →p p -φ at BESIII 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
Using a data sample of 1.31×109 J/ψ events accumulated with the BESIII detector, the decay J/ψ→p¯pϕ is studied via two decay modes, ϕ→K0SK0L and ϕ→K+K−. The branching fraction of J/ψ→p¯pϕ is measured to be B(J/ψ→p¯pϕ)=[5.23±0.06(stat)±0.33(syst)]×10−5, which agrees well with a previously published measurement, but with a significantly improved precision. No evident enhancement near the p¯p mass threshold, denoted as X(p¯p), is observed, and the upper limit on the branching fraction of J/ψ→X(p¯p)ϕ→p¯pϕ is determined to be B(J/ψ→X(p¯p)ϕ→p¯pϕ)<2.1×10−7 at the 90% confidence level.File in questo prodotto:
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