LHCb gets closer to discovering the second doubly charmed baryon

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 25-26
• 页数: 2页
• 语种: 英文

摘要

Recently the LHCb Collaboration [1] published the results of a search for the doubly charmed baryon (E)+cc No significant signal is seen in the mass range from 3.4 to 3.8 GeV.To put this result in context,the (E)++CC baryon was seen by LHCb in decay modes (Λ)cK-π+π+ [2] (2017) and (E)+cπ+ [3] (2018).The weighted average of the (E)++cc mass is 3621.24 ± 0.65 (stat.) ± 0.31 (syst.) MeV [3]. The (E)+c+c and (E)+cc have the quark content ccu and ccd,respectively.Under the isospin symmetry of the strong interactions they form an isodoublet,like the proton and the neutron.Isospin breaking in hadron masses is a very small effect [4].