Abstract Questions about detecting the CP-violating decay process of J/ψ→ K^0K^-0→ KsKs are discussed. Possible background and material regeneration effects are analyzed. The discussion can be directly extended to ...Abstract Questions about detecting the CP-violating decay process of J/ψ→ K^0K^-0→ KsKs are discussed. Possible background and material regeneration effects are analyzed. The discussion can be directly extended to other vector quarkonium decays, like γ, ψ(2S) and Ф → KsKs.展开更多
Based on the branching fractions of J/ψ→VP from different experiments, we investigate the properties of the coupling constants of J/ψ→ VP decays using a model-dependent approach. We find that the octet coupling co...Based on the branching fractions of J/ψ→VP from different experiments, we investigate the properties of the coupling constants of J/ψ→ VP decays using a model-dependent approach. We find that the octet coupling constant, gs, of strong interaction is about twice larger than that of the singlet coupling constant g1; the electromag- netic breaking parameters g_E^i are larger than the mass breaking parameters g_M^i, moreover, the three parameters of the electromagnetic effect are about equal, but the three parameters of the mass effect are obviously different and their uncertainties are also large; and the phase angle between strong and electromagnetic interactions is in the range of 700-80°. It deepens our understanding of the coupling constant of J/ψ→VP decays.展开更多
Based on the branching fractions of J/ψ(ψ(2S))→ VP from different collaborations, pseudoscalar mixing is extensively discussed with a well established phenomenological model. The mixing angle is determined to b...Based on the branching fractions of J/ψ(ψ(2S))→ VP from different collaborations, pseudoscalar mixing is extensively discussed with a well established phenomenological model. The mixing angle is determined to be -14° by fitting to the new world average if only quark content is considered. After taking into account the gluonic content in η and η' simultaneously, the investigation shows that η favors only consisting of light quarks, while the gluonic content of η' is Z2η', = 0.30±0.24.展开更多
While indirect and direct C P violation(CPV) has been established in the decays of strange and beauty mesons, no CPV has yet been found for baryons. There are different paths to finding C P asymmetry in the decays o...While indirect and direct C P violation(CPV) has been established in the decays of strange and beauty mesons, no CPV has yet been found for baryons. There are different paths to finding C P asymmetry in the decays of strange baryons; they are all highly non-trivial. The Hyper CP Collaboration has probed CPV in the decays of singleΞ and Λ [1]. We discuss future lessons from e~+e^-collisions at BESⅢ/BEPCⅡ: probing decays of pairs of strange baryons, namely Λ, Σ and . Realistic goals are to learn about non-perturbative QCD. One can hope to find CPV in the decays of strange baryons; one can also dream of finding the impact of New Dynamics. We point out that an important new era will start with the BESIII/BEPCII data accumulated by the end of 2018. This also supports new ideas to trigger J/ψ→■Λ at the LHCb collaboration.展开更多
We reported the observation of Y(2175) in Фfo(980) mass spectrum in J/ψ → ηФfo(980) with fo(980) →π+π^- and the observation of a broad 1^-- resonance of K^+K^- mass in J/ψ→ K^+K^-π^0. The results...We reported the observation of Y(2175) in Фfo(980) mass spectrum in J/ψ → ηФfo(980) with fo(980) →π+π^- and the observation of a broad 1^-- resonance of K^+K^- mass in J/ψ→ K^+K^-π^0. The results from the partial wave analyses of J/ψ→γπ^+π^- and γπ^0π^0, as well as J/ψ →pK^-∧. are also presented.展开更多
基金Supported by National Natural Science Foundation of China, Knowledge Innovation Project of CAS (U-530, U-612 (IHEP))
文摘Abstract Questions about detecting the CP-violating decay process of J/ψ→ K^0K^-0→ KsKs are discussed. Possible background and material regeneration effects are analyzed. The discussion can be directly extended to other vector quarkonium decays, like γ, ψ(2S) and Ф → KsKs.
基金Supported by the National Natural Science Foundation of China (10979008)Program for Science and Technology Innovation Talents in Universities of He’nan Province (2012HASTIT030)the Natural Science Foundation of He’nan Province (102300410210)
文摘Based on the branching fractions of J/ψ→VP from different experiments, we investigate the properties of the coupling constants of J/ψ→ VP decays using a model-dependent approach. We find that the octet coupling constant, gs, of strong interaction is about twice larger than that of the singlet coupling constant g1; the electromag- netic breaking parameters g_E^i are larger than the mass breaking parameters g_M^i, moreover, the three parameters of the electromagnetic effect are about equal, but the three parameters of the mass effect are obviously different and their uncertainties are also large; and the phase angle between strong and electromagnetic interactions is in the range of 700-80°. It deepens our understanding of the coupling constant of J/ψ→VP decays.
基金Supported by National Natural Science Foundation of China (10979012)
文摘Based on the branching fractions of J/ψ(ψ(2S))→ VP from different collaborations, pseudoscalar mixing is extensively discussed with a well established phenomenological model. The mixing angle is determined to be -14° by fitting to the new world average if only quark content is considered. After taking into account the gluonic content in η and η' simultaneously, the investigation shows that η favors only consisting of light quarks, while the gluonic content of η' is Z2η', = 0.30±0.24.
基金Supported by National Science Foundation(PHY-1520966)National Natural Science Foundation of China(11335009,11125525)+3 种基金Joint Large-Scale Scientific Facility Funds of the NSFC and CAS(U1532257)the National Key Basic Research Program of China(2015CB856700)Key Research Program of Frontier Sciences,CAS,(QYZDJ-SSW-SLH003)XWK’s work is also supported by MOST(Taiwan)(104-2112-M-001-022)
文摘While indirect and direct C P violation(CPV) has been established in the decays of strange and beauty mesons, no CPV has yet been found for baryons. There are different paths to finding C P asymmetry in the decays of strange baryons; they are all highly non-trivial. The Hyper CP Collaboration has probed CPV in the decays of singleΞ and Λ [1]. We discuss future lessons from e~+e^-collisions at BESⅢ/BEPCⅡ: probing decays of pairs of strange baryons, namely Λ, Σ and . Realistic goals are to learn about non-perturbative QCD. One can hope to find CPV in the decays of strange baryons; one can also dream of finding the impact of New Dynamics. We point out that an important new era will start with the BESIII/BEPCII data accumulated by the end of 2018. This also supports new ideas to trigger J/ψ→■Λ at the LHCb collaboration.
基金National Natural Science Foundation of China(10491300,10225524,10225525,10425523,10625524,10521003)
文摘We reported the observation of Y(2175) in Фfo(980) mass spectrum in J/ψ → ηФfo(980) with fo(980) →π+π^- and the observation of a broad 1^-- resonance of K^+K^- mass in J/ψ→ K^+K^-π^0. The results from the partial wave analyses of J/ψ→γπ^+π^- and γπ^0π^0, as well as J/ψ →pK^-∧. are also presented.