Triangle singularity enhancing isospin violation in B~0_s→ J/ψπ~0f_0(980) |
| |
引用本文: | 梁伟红,S.Sakai,谢聚军,E.Oset.Triangle singularity enhancing isospin violation in B~0_s→ J/ψπ~0f_0(980)[J].中国物理C(英文版),2018(4). |
| |
作者姓名: | 梁伟红 S.Sakai 谢聚军 E.Oset |
| |
摘 要: | We perform calculations for theB~0_s→J/ψπ~0f_0(980) andB~0_s→J/ψπ~0a_0(980) reactions, showing that the first is isospin-suppressed while the second is isospin-allowed. The reaction proceeds via a triangle mechanism, with B~0_s→J/ψK* Kˉ+c.c., followed by the decay K*→Kπ and a further fusion of K Kˉ into the f0(980) or a0(980). We show that the mechanism develops a singularity around the π~0f_0(980) or πa_0(980) invariant mass of 1420 Me V, where the π~0f_0 and π~0a_0 decay modes are magnified and also the ratio of π~0f_0 to π~0a_0 production. Using experimental information for theB~0_s→J/ψK* Kˉ+c.c. decay, we are able to obtain absolute values for the reactions studied which fall into the experimentally accessible range. The reactions proposed and the observables evaluated, when contrasted with actual experiments, should be very valuable to obtain information on the nature of the low lying scalar mesons.
|
本文献已被 CNKI 等数据库收录! |
|