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Complementary to the conventional experimental studies on N* from πN and γ(*)N reactions, the e+e-, pp and pp collisions can give novel insights into these N* resonances. While the e+e- collisions through production and decay of vector charmonium ψ provide a nice isospin filter for a simultaneously study of N*, △*, ∧*, ∑* and 2*, the pp collisions should be the best place for producing those △*++ with large coupling to p+p though pp →nA*++ reaction, and the pp collisions should be the best place for looking for those N* with large coupling to σN. 相似文献
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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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北京正负电子对撞机上的BES实验为系统地进行重子谱研究提供了一个很好的舞台,由于很多待研究的衰变道末态为多个小动量的粒子,给探测和分析带来困难.本工作以通过衰变道J/ψ→[I]^*∧K^-研究激发态为例,比较了不同模型的蒙特卡罗模拟,并结合实验数据,分析了该类型重子谱研究的探测限及产生子和探测器模拟对结果的影响。 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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夸克偶素双光子衰变的相对论效应 总被引:1,自引:0,他引:1
考虑到各种相对论效应,唯象地研究了0-+和0++夸克偶素的双光子衰变. 相比于通常用的非相对论近似,我们的相对论唯象方法给出了3种分别由介子内夸克相对动量,相对能量,以及它的自旋形式的选取带来的效应. 在cc和ss中我们做了具体的分析 相似文献
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在相对论协变张量分析的理论框架下 ,给出了衰变道J ψ→p pω对应各种可能的中间共振态N 的衰变振幅 ,通过Monte Carlo模拟 ,得到该衰变道中p( p)角分布、pω( pω)不变质量分布及Dalitz图等 . 相似文献