Light nuclei production in Au+Au collisions at √^(s)NN=3 GeV from coalescence model

The nucleon coalescence model is one of the most popular theoretical models for light nuclei production in high-energy heavy-ion collisions.The production of light nuclei d,t,^(3)He,and^(4)He is studied using the transport model JAM with a simplified afterburner coalescence at√^(s)NN=3 GeV Au+Au collisions.We scan the cut-off of phenomenological coalescence parameters,i.e.,the relative spatial distance△R and momentum difference△P,for the formation of light nuclei by nucleon coalescence to reproduce the light nuclei pTspectra measured by the STAR experiment.The results indicate a potential connection between the coalescence parameters and the binding energy as well as the diameter of these light nuclei.

Belle实验γ(5S)数据中新类底偶素态的寻找

Belle实验组利用在(5S)共振峰上采集的大数据样本,对e+e-→π+π-(n S)和π+π-hb(m P)(n=1,2,3,m=1,2)过程进行了研究,在π±γ(n S)和π±hb(m P)的系统中,同时观测到了两个新的带电类底偶素结——Zb(10610)和Zb(10650)。它们衰变到底偶素末态,同时还带有电荷,所以它们的组成成份中至少含有4个夸克。最近,对e+e-→π+π-π0γ(1S)过程也进行了研究,在ωγ(1S)系统中对类X(3872)的底偶素态Xb进行了寻找。