Λc重子谱疑难
Puzzle of the Λc Spectrum
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摘要: Λ+c重子家族存在一个疑难,也就是重夸克有效理论预言的轨道角动量为L=2的多重态中JP=3/2+的态在实验上是缺失的,而且已发现的Λc(2765)+和Λc(2940)+的JP量子数仍然未知.在本工作中,我们使用双夸克图像计算了重子的质量,研究了Λc(2765)+和Λc(2940)+的可能归类以及仍缺失的具有L=2和JP=3/2+量子数的Λ+c态,进而指出Λc(2880)+的峰结构中实际上已经包含了L=2、JP=3/2+这一缺失态,并建议Λc(2765)+和Λc(2940)+的量子数应分别为2S(1/2+)和2P(1/2-).Abstract: There is a puzzle in the Λc+ family,i.e.,one member with JP =3/2+ is missing in a L =2 multiplet which the heavy quark effective theory predicts,and JP's of Λc(2765)+ and Λc(2940)+ are unknown.Using a light diquark picture to calculate baryon masses,we study possible assignments of two Λc's with unknown JP and the missing Λc+ with 3/2+ for L =2,and we find the most probable possibility that the peak corresponding to Λc(2880)+ actually includes a missing member with spin 3/2+ for L =2 and that quantum numbers of Λc(2765)+ and Λc(2940)+ are 2S(1/2+) and 2P(1/2-),respectively.
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