Radiative decay of theΞ(1620)in a hadronic molecule picture  

作　　者：Yin Huang Feng Yang HongQiang Zhu 黄银;杨峰;朱洪强(School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China;College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China [2]College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China

出　　处：《Chinese Physics C》2021年第7期142-150,共9页中国物理C（英文版）

基　　金：Supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (KJQN201800510);the Opened Fund of the State Key Laboratory on Integrated Optoelectronics (IOSKL2017KF19).;support from the Development and Exchange Platform for the Theoretic Physics of Southwest Jiaotong University (11947404, 12047576);the Fundamental Research Funds for the Central Universities (2682020CX70);the National Natural Science Foundation of China (12005177)

摘　　要：Last year,the Ξ(1620) state,which is cataloged in the Particle Data Group(PDG) with only one star,was reported again in the Ξ-π+final state by the Belle Collaboration.Its properties,such as the spectroscopy and decay width,cannot be simply explained in the context of conventional constituent quark models.This inspires an active discussion on the structure of this resonance.In this paper,we study the radiative decays of the newly observed Ξ(1620) assuming that it is a meson-baryon molecular state of AK and with spin-parity JP=1/2-developed in our previous study.The partial decay widths of the AK-ΣK molecular state into Ξγ and Ξπγ final states through hadronic loops are evaluated using effective Lagrangians.The partial widths for Ξ(1620)^(0)→γΞ is evaluated to be approximately 118.76-174.21 keV,which may be accessible for the LHCb experiment.If Ξ(1620) is aΛK-∑K molecule,the radiative transition strength Ξ(1620)^(0)→γKA is considerably small and the decay width is of the order of 0.01 eV.Future experimental measurements of these processes can be useful to test the molecule interpretations of the Ξ(1620).

关 键 词：meson-baryon molecular state decay widths radiative decays 

分 类 号：O572.3[理学—粒子物理与原子核物理]