Λc重子谱疑难(英文)

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Λ_c（2765）+和Λ_c（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Λ_c（2765）+和Λ_c（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Λ_c（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Λ_c（2765）+和Λ_c（2940）+的量子数应分别为2S（1/2+）和2P（1/2-）。There is a puzzle in the Λ_c+ 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 Λ_c(2765)+ and Λ_c(2940)+ are unknown. Using a light diquark picture to calculate baryon masses, we study possible assignments of two Λ_c's with unknown JP and the missing Λ_c+ with 3/2+ for L=2, and we find the most probable possibility that the peak corresponding to Λ_c(2880)+ actually includes a missing member with spin 3/2+ for L=2 and that quantum numbers of Λ_c(2765)+ and Λ_c(2940)+ are 2S(1/2+) and 2P (1/2-), respectively.

Puzzle of the Λc Spectrum

There is a puzzle in the Λ_c⁺ family, i.e., one member with J^P=3/2⁺ is missing in a L=2 multiplet which the heavy quark effective theory predicts, and J^P's of Λ_c(2765)⁺ and Λ_c(2940)⁺ are unknown. Using a light diquark picture to calculate baryon masses, we study possible assignments of two Λ_c's with unknown J^P and the missing Λ_c⁺ with 3/2⁺ for L=2, and we find the most probable possibility that the peak corresponding to Λ_c(2880)⁺ actually includes a missing member with spin 3/2⁺ for L=2 and that quantum numbers of Λ_c(2765)⁺ and Λ_c(2940)⁺ are 2S(1/2⁺) and 2P (1/2^-), respectively.