The decay constants of the low lying S-wave B_(c)mesons,i.e.B_(c)(nS) and B_(c)^(*)(nS) with n ≤3,are calculated in the nonrelativistic quark model.The running coupling of the strong interaction is taken into account...The decay constants of the low lying S-wave B_(c)mesons,i.e.B_(c)(nS) and B_(c)^(*)(nS) with n ≤3,are calculated in the nonrelativistic quark model.The running coupling of the strong interaction is taken into account,and the uncertainties due to varying parameters and losing Lorentz covariance are considered carefully.As a byproduct,the decay constants of the low lying S-wave charmonium and bottomium states are given in the appendixes.展开更多
In our previous studies,we analyzed the two-body strong decays of the low-lyingΩbaryon states within a chiral quark model.The results showed that the mass,total width,and two body decayΩ(2012)→■could be well repro...In our previous studies,we analyzed the two-body strong decays of the low-lyingΩbaryon states within a chiral quark model.The results showed that the mass,total width,and two body decayΩ(2012)→■could be well reproduced with the spin-parity J^(P)=3/2^(-)stateΩ^(*)|1P_(3/2^(-))>classified in the quark model.Stimulated by the new observations of the three-body decay processΩ(2012)^(-)→■at Belle,in the present study,we further investigate the three-body strong decayΩ^(*)|1P_(3/2^(-))>→■within the chiral quark model.It is found that theΩ^(*)|1P_(3/2^(-))>has a sizeable decay rate into the three-body final states■.When consideringΩ^(*)|1P_(3/2^(-))>as theΩ(2012)resonance,the predicted ratio■is close to the upper limit 11%measured by the Belle Collaboration in 2019;however,it is too small to be comparable to the recent measurement 0.97±0.24±0.07.In addition,the coupled-channel effects on the bare three-quark stateΩ^(*)|1P_(3/2^(-))>from nearby channels■are studied.Our theoretical results show that the coupled-channel effects onΩ^(*)|1P_(3/2^(-))>are not very large,and the molecular component is no more than 30%.To clarify the nature ofΩ(2012)resonance,precise measurements on the ratio■are needed,and further investigation on the effects of coupled channels is recommended.展开更多
A flavor dependent kernel is constructed based on the rainbow-ladder truncation of the Dyson-Schwinger and Bethe-Salpeter equations in quantum chromodynamics.The quark-antiquark interaction is composed of a flavor dep...A flavor dependent kernel is constructed based on the rainbow-ladder truncation of the Dyson-Schwinger and Bethe-Salpeter equations in quantum chromodynamics.The quark-antiquark interaction is composed of a flavor dependent infrared part and a flavor independent ultraviolet part.Our model gives a successful and unified description of the light,heavy and heavy-light ground state pseudoscalar and vector mesons.Our model shows,for the first time,that the infrared enhanced quark-antiquark interaction is stronger and wider for lighter quarks.展开更多
基金Supported by the National Natural Science Foundation of China (12005060)。
文摘The decay constants of the low lying S-wave B_(c)mesons,i.e.B_(c)(nS) and B_(c)^(*)(nS) with n ≤3,are calculated in the nonrelativistic quark model.The running coupling of the strong interaction is taken into account,and the uncertainties due to varying parameters and losing Lorentz covariance are considered carefully.As a byproduct,the decay constants of the low lying S-wave charmonium and bottomium states are given in the appendixes.
基金Supported by the National Natural Science Foundation of China(12175065,12005060,12075288,11735003,11961141012)supported by the Youth Innovation Promotion Association CAS。
文摘In our previous studies,we analyzed the two-body strong decays of the low-lyingΩbaryon states within a chiral quark model.The results showed that the mass,total width,and two body decayΩ(2012)→■could be well reproduced with the spin-parity J^(P)=3/2^(-)stateΩ^(*)|1P_(3/2^(-))>classified in the quark model.Stimulated by the new observations of the three-body decay processΩ(2012)^(-)→■at Belle,in the present study,we further investigate the three-body strong decayΩ^(*)|1P_(3/2^(-))>→■within the chiral quark model.It is found that theΩ^(*)|1P_(3/2^(-))>has a sizeable decay rate into the three-body final states■.When consideringΩ^(*)|1P_(3/2^(-))>as theΩ(2012)resonance,the predicted ratio■is close to the upper limit 11%measured by the Belle Collaboration in 2019;however,it is too small to be comparable to the recent measurement 0.97±0.24±0.07.In addition,the coupled-channel effects on the bare three-quark stateΩ^(*)|1P_(3/2^(-))>from nearby channels■are studied.Our theoretical results show that the coupled-channel effects onΩ^(*)|1P_(3/2^(-))>are not very large,and the molecular component is no more than 30%.To clarify the nature ofΩ(2012)resonance,precise measurements on the ratio■are needed,and further investigation on the effects of coupled channels is recommended.
基金Work supported by:the Chinese Government’s Thousand Talents Plan for Young Professionals
文摘A flavor dependent kernel is constructed based on the rainbow-ladder truncation of the Dyson-Schwinger and Bethe-Salpeter equations in quantum chromodynamics.The quark-antiquark interaction is composed of a flavor dependent infrared part and a flavor independent ultraviolet part.Our model gives a successful and unified description of the light,heavy and heavy-light ground state pseudoscalar and vector mesons.Our model shows,for the first time,that the infrared enhanced quark-antiquark interaction is stronger and wider for lighter quarks.
