The observations of fully-charm tetraquark states in the LHCb,CMS,and ATLAS experiments suggested the existence of hadronic molecules of two-charmonium states,which may also imply bound states in the threecharmonium s...The observations of fully-charm tetraquark states in the LHCb,CMS,and ATLAS experiments suggested the existence of hadronic molecules of two-charmonium states,which may also imply bound states in the threecharmonium systems.In this work,we study the possible bound states in the triple-ηcand triple-J/ψsystems with J^(PC)=0^(-+)and 1^(--),respectively.In quantum chromodynamics sum rules,we calculate the two-point correlation functions and spectral functions up to the dimension-four gluon condensate.We use the iterative dispersion relation approach to deal with the five-loop banana integrals,which significantly improves computational efficiency.Our results show that the masses of triple-ηcand triple-J/ψstates lie below the corresponding mass thresholds,supporting the existence of such three-body bound states.展开更多
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 production of J/ψ mesons in p+p and p+Pb collisions is studied in the framework of color-glass condensate together with a simple color evaporation model.Considering the nuclear effects with the Glauber–Gribov ap...The production of J/ψ mesons in p+p and p+Pb collisions is studied in the framework of color-glass condensate together with a simple color evaporation model.Considering the nuclear effects with the Glauber–Gribov approach,we calculate the cross section and the nuclear modification factor of forward J/ψ production in p+Pb collisions at s^(1/2) 5:02 TeV.Then,the backward J/ψ production in p+Pb collisions at s^(1/2) 8:16 Te V is also analyzed.In our calculation,the phenomenology KLRAd S/CFT model and the rc BK approach,which are valid at a small x,are used to calculate the three-point function.It is shown that the theoretical results fit well with the experimental data from ALICE and LHCb.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12175318)the Natural Science Foundation of Guangdong Province of China(Grant No.2023A1515011704)。
文摘The observations of fully-charm tetraquark states in the LHCb,CMS,and ATLAS experiments suggested the existence of hadronic molecules of two-charmonium states,which may also imply bound states in the threecharmonium systems.In this work,we study the possible bound states in the triple-ηcand triple-J/ψsystems with J^(PC)=0^(-+)and 1^(--),respectively.In quantum chromodynamics sum rules,we calculate the two-point correlation functions and spectral functions up to the dimension-four gluon condensate.We use the iterative dispersion relation approach to deal with the five-loop banana integrals,which significantly improves computational efficiency.Our results show that the masses of triple-ηcand triple-J/ψstates lie below the corresponding mass thresholds,supporting the existence of such three-body bound states.
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 by the Natural Science Foundation of Hebei Province(A2012210043)
文摘The production of J/ψ mesons in p+p and p+Pb collisions is studied in the framework of color-glass condensate together with a simple color evaporation model.Considering the nuclear effects with the Glauber–Gribov approach,we calculate the cross section and the nuclear modification factor of forward J/ψ production in p+Pb collisions at s^(1/2) 5:02 TeV.Then,the backward J/ψ production in p+Pb collisions at s^(1/2) 8:16 Te V is also analyzed.In our calculation,the phenomenology KLRAd S/CFT model and the rc BK approach,which are valid at a small x,are used to calculate the three-point function.It is shown that the theoretical results fit well with the experimental data from ALICE and LHCb.
