科研之友
微信
新浪微博
Facebook
分享链接
摘要
The strong decays of Xi baryons up to N = 2 shell are studied in a chiral quark model. The strong decay properties of these well-established ground decuplet baryons are reasonably described. We find that (i) Xi(1690) and Xi(1820) could be assigned to the spin-parity J(P) = 1/2(-) state vertical bar 70, (2)8, 1, 1, 1/2(-) i and the spin-parity J(P) = 3/2(-) state vertical bar 70, (2)8, 1, 1, 3/2(-) , respectively. Slight configuration mixing might exist in these two negative parity states. (ii) Xi(1950) might correspond to several different Xi resonances. The broad states (Gamma similar to 100 MeV) observed in the Xi pi channel could be classified as the pure J(P) = 5/2(-) octet state vertical bar 70, (4)8, 1, 1, 5/2(-) or the mixed state vertical bar Xi 1/2(-)(3) with J(P) = 1/2(-). The Xi resonances with moderate width (Gamma similar to 60 MeV) observed in the Xi pi channel might correspond to the J(P) = 1/2(+) excitation vertical bar 56, (4)10, 2, 2, 1/2(+). The second orbital excitation vertical bar 56, (4)10, 2, 2, 3/2(+) and the mixed state vertical bar Xi 1/2(-)(1) might be candidates for the narrow width state observed in the Lambda(K) over bar channel; however, their spin-parity numbers are incompatible with the moment analysis of the data. (iii) Xi(2030) could not be assigned to either any spin-parity J(P) = 7/2(+) states or any pure J(P) = 5/2(+) configurations. It seems to favor the vertical bar 70, (2)8, 2, 2, 3/2(+) assignment; however, its spin conflicts with the moment analysis of the data. To find more Xi resonances, the observations in the Xi(1530)pi and Sigma(1385)(K) over bar channels are necessary.
- 出版日期2013-5-2
- 单位湖南师范大学
