Masses of doubly and triply charmed baryons
Masses of doubly and triply charmed baryons
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DOI：
10.1103/physrevd.92.076008
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发表时间：
2015-03
影响因子：
5
通讯作者：
K. Wei;Bing Chen;Xin-Heng Guo
中科院分区：
文献类型：
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作者：
K. Wei;Bing Chen;Xin-Heng Guo
到目前为止，第一个被报道的双魅力重子�+(3520)仍然是一个谜。它是由Selex Collaboration发现并确认的，但没有得到LHCb、Babar、Belle、Focus或任何其他合作伙伴的确认。本文首先利用Regge唯象，将基态(L=0)双魅力重子∗+cc的质量表示为已建立的轻重子和单魅力重子质量的函数。插入最近的实验数据，给出了∗+cc的质量为3809±36 MeV，它与任何不可观测的参数无关。然后，利用二次质量关系，计算了基态三重魅力重子++和双魅力重子�(∗)++cc，�(∗)+cc和+(�+的质量为3520+4140 MeV，与�+(3520)的质量一致)的质量。同位旋分裂M�++M�+=0.4±0.3 MeV。然后，估算了受轨道激发(L=1，2，3)的双重和三重魅力重子的质量。与许多其他方法提取的结果相比，结果是合理的。我们建议从理论和实验上更多地研究双重和三重魅力重子，不仅是为了重子谱的丰度，也是为了从数值上检验在自然界中是否实现了线性质量关系或二次质量关系。我们的预言对于发现未被观测到的双重和三重魅力重子态以及这些态的J-P指认是有用的。
Until now, the first reported doubly charmed baryon � +(3520) is still a puzzle. It was discovered and confirmed by SELEX collaboration, but not confirmed by LHCb, BABAR, BELLE, FOCUS, or any other collaboration. In the present paper, by employing Regge phenomenology, we first express the mass of the ground state (L=0) doubly charmed baryon ∗+ cc as a function of masses of the well established light baryons and singly charmed baryons. Inserting the recent experimental data, the mass of ∗+ cc is given to be 3809±36 MeV, which is independent of any unobservable parameters. Then, with the quadratic mass relations, we calculate the masses of the ground state triply charmed baryon ++ and doubly charmed baryons � (∗)++ cc , � (∗)+ cc , and + (the mass of � + is determined as 3520 +4140 MeV, which agrees with the mass of � + (3520)). The isospin splitting M � ++ M � + = 0.4 ± 0.3 MeV. After that, masses of the orbitally excited (L=1,2,3) doubly and triply charmed baryons are estimated. The results are reasonable comparing with those extracted in many other approaches. We suggest more efforts to study doubly and triply charmed baryons both theoretically and experimentally, not only for the abundance of baryon spectra, but also for numerically examining whether the linear mass relations or the quadratic mass relations are realized in nature. Our predictions are useful for the discovery of unobserved doubly and triply charmed baryon states and the J P assignment of these states.