通过J/Ψ→p p ,p N ,N N 衰变 ,研究了Roper共振态的混杂态结构对衰变角分布和分支比的影响 .计算结果表明 ,如果Roper共振态为纯混杂态 ,那么J/Ψ→p N ,N N 的角分布几乎相等 ,而J/Ψ衰变到混杂态的衰变宽度还不到J/Ψ→p p的 1% ...通过J/Ψ→p p ,p N ,N N 衰变 ,研究了Roper共振态的混杂态结构对衰变角分布和分支比的影响 .计算结果表明 ,如果Roper共振态为纯混杂态 ,那么J/Ψ→p N ,N N 的角分布几乎相等 ,而J/Ψ衰变到混杂态的衰变宽度还不到J/Ψ→p p的 1% ,给出了Γ(J/Ψ→N p ) /Γ(J/Ψ→p p)和Γ(J/Ψ→N N ) /Γ(J/Ψ→ p p)随混合参数的变化关系 ,并讨论了在J/Ψ衰变中研究Roper混杂态结构的可能性 .展开更多
The behaviour of dilaton-gluon coupling （DGC） potential is investigated by studying charmonium spectra, annihilation rates and E1 transition rates systematically. We find that in the non-relativistic quantum chromod...The behaviour of dilaton-gluon coupling （DGC） potential is investigated by studying charmonium spectra, annihilation rates and E1 transition rates systematically. We find that in the non-relativistic quantum chromodynamics approximation, the charmonium properties can be described by the DGC potential.展开更多
It is crucial to determine the spin and parity （jR） of Zc（3900）＋ for understanding its structure. We perform a helicity amplitude analysis on Zc（3900）＋ in the process e＋e- →π＋π-J/φ＊ with the hypotheses ...It is crucial to determine the spin and parity （jR） of Zc（3900）＋ for understanding its structure. We perform a helicity amplitude analysis on Zc（3900）＋ in the process e＋e- →π＋π-J/φ＊ with the hypotheses JP = 0-, 1＋, 1-, 2＋ and 2-. To estimate the significance of JP = 1＋ over other hypotheses, we perform a Monte Carlo simulation study, and we also discuss the prospect of measuring the spin parity in the future experiment with a large data sample.展开更多
Using J/ψ decays collected with the BES Ⅲ detector, Lundcharm model parameters are optimized with J/ψlight hadron decays. The dependence of the response function on model parameters is approximated up to the quadra...Using J/ψ decays collected with the BES Ⅲ detector, Lundcharm model parameters are optimized with J/ψlight hadron decays. The dependence of the response function on model parameters is approximated up to the quadratic term, and the model parameters are optimized by simultaneously fitting J/ψ inclusive charged track distributions and event shapes. The Monte Carlo simulations show that optimal parameters yield satisfactory MC distributions as compared to both the J/ψ and ψ（2S） data distributions. These optimal values are suggested for the Lundcharm model to produce J/ψ and ψ（2S） decays to light hadrons.展开更多
Based on the naive quark model, we calculate angular distributions for heavy quarkonium decays into pN＊ （1440）, decuplet baryon pairs, and octet-decuplet baryon pairs. The general formulae of angular distributions ...Based on the naive quark model, we calculate angular distributions for heavy quarkonium decays into pN＊ （1440）, decuplet baryon pairs, and octet-decuplet baryon pairs. The general formulae of angular distributions are given explicitly. Quark mass effects on the violation of the helicity conservation and the prospect to look for them in J/ψ hadronic decays are discussed.展开更多
文摘通过J/Ψ→p p ,p N ,N N 衰变 ,研究了Roper共振态的混杂态结构对衰变角分布和分支比的影响 .计算结果表明 ,如果Roper共振态为纯混杂态 ,那么J/Ψ→p N ,N N 的角分布几乎相等 ,而J/Ψ衰变到混杂态的衰变宽度还不到J/Ψ→p p的 1% ,给出了Γ(J/Ψ→N p ) /Γ(J/Ψ→p p)和Γ(J/Ψ→N N ) /Γ(J/Ψ→ p p)随混合参数的变化关系 ,并讨论了在J/Ψ衰变中研究Roper混杂态结构的可能性 .
基金Supported partially by the National Natural Science Foundation of China under Grants Nos 10447130 and 10375074.
文摘The behaviour of dilaton-gluon coupling （DGC） potential is investigated by studying charmonium spectra, annihilation rates and E1 transition rates systematically. We find that in the non-relativistic quantum chromodynamics approximation, the charmonium properties can be described by the DGC potential.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11175146 and 11375205the Netherlands Project CEP under Grant No 530-4CDP03
文摘It is crucial to determine the spin and parity （jR） of Zc（3900）＋ for understanding its structure. We perform a helicity amplitude analysis on Zc（3900）＋ in the process e＋e- →π＋π-J/φ＊ with the hypotheses JP = 0-, 1＋, 1-, 2＋ and 2-. To estimate the significance of JP = 1＋ over other hypotheses, we perform a Monte Carlo simulation study, and we also discuss the prospect of measuring the spin parity in the future experiment with a large data sample.
基金Supported by the National Natural Science Foundation of China under Grand Nos 11079038, 11235011, 11375205, and 11175146.
文摘Using J/ψ decays collected with the BES Ⅲ detector, Lundcharm model parameters are optimized with J/ψlight hadron decays. The dependence of the response function on model parameters is approximated up to the quadratic term, and the model parameters are optimized by simultaneously fitting J/ψ inclusive charged track distributions and event shapes. The Monte Carlo simulations show that optimal parameters yield satisfactory MC distributions as compared to both the J/ψ and ψ（2S） data distributions. These optimal values are suggested for the Lundcharm model to produce J/ψ and ψ（2S） decays to light hadrons.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10491303 and 10521003, the Knowledge Innovation Project of Chinese Academy of Sciences under Contract No U-612 （IHEP）.
文摘Based on the naive quark model, we calculate angular distributions for heavy quarkonium decays into pN＊ （1440）, decuplet baryon pairs, and octet-decuplet baryon pairs. The general formulae of angular distributions are given explicitly. Quark mass effects on the violation of the helicity conservation and the prospect to look for them in J/ψ hadronic decays are discussed.
