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In this proceeding, we propose to directly measure the a0^0(980)-f0 (980) mixing in J/ψ→φf0(980)→φa0^0(980) and Xc1→π^0a0^0(980) →π^0f0(980) with the upgraded Beijing Electron Positron Collider(BEPCII) with BESIII detector. We show that a narrow peak of about 8 MeV will be produced by the a0^0(980)-f0(980) mixing, and the predominant feature makes it standing out from the background contributions. The predicted branching ratios for these two reactions are both expected to be about O(10^-6), which is unambiguously accessible with 10^9 J/ψ and 3 × 10^8 Xc1 at BESⅢ. 相似文献
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A new particle Σ^ * with J ^P = 1/2^-was predicted by unquenched quark models with its mass around the well established Σ * (1385) with J P = 3/2 + .Here we re-examine some old data of the K^-p → Λπ^-π^ + reaction.Firstly we re-fit the data for kaon beam momenta in the range of 1.0 - 1.8 GeV.Secondly we study the reaction at the energies around Λ*(1520) peak.Both studies show evidence for the existence of Σ*with J^ P = 1/2^-around 1380 MeV.Higher statistic data on relevant reactions are needed to clarify the situation. 相似文献
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