1P波激发态粲介子和底介子的质量劈裂

Mass Splitting of Excited Charmed and Bottom Mesons in 1P Wave

应用线性Regge轨迹和相对论夸克模型,研究了低激发态单重介子谱,并解释了这些激发态的窄质量劈裂源自轻夸克的相对论效应。计算了自旋宇称为J^(+)(J=0,1,2)的单重介子(D,D_(S),B,B_(S))P波的质量,并建议存在0;态的,未被实验发现的B介子和B_(S)介子,其质量分别为5 659 MeV和5 788 MeV。计算表明,D_(s0)(2317)包含70 MeV左右的质量下移而D_(s1)(2460)则没有显著的质量移动。

We apply linear Regge trajectory and relatived quark model to revisit the low-lying excited singly-heavy mesons and explain the narrow mass splitting of these excited states to arise mainly from relativistic effect of the light quarks.The P-wave masses of the singly heavy mesons (D,D_(S),B,B_(S)) with spin-parity J^(+)(J=0,1,2) have been computed,suggesting the unseen states of the mesons B and B_(S)to be the 0^(+)state with mass 5 659 and 5 788 Me V,respectively.Our calculations show that D_(s0)(2 317)contains a mass downshift of around 70 Me V whileD_(s1)(2 460)has no significant mass shift.