Evidence for resonant structures in e^+e^-→π^+π^-h_c  

作　　者：苑长征 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics C》2014年第4期1-4,共4页中国物理C（英文版）

基　　金：Supported by Ministry of Science and Technology of China(2009CB825203);National Natural Science Foundation of China(NSFC)(10825524,10935008,11235011)

摘　　要：： The cross sections of e＋e-→π＋π-hc at center-of-mass energies from 3.90 to 4.42 GeV were measured by the BESIII and the CLEO-c experiments. Resonant structures are evident in the e＋e-→π＋π-hc line shape. The fit to the line shape results in a narrow structure at a mass of （4216±18） MeV/c2 and a width of （39±2） MeV, and a possible wide structure of mass （4293±9） MeV/c2 and width （222=k67） MeV. Here, the errors are combined statistical and systematic errors. This may indicate that the Y（4260） state observed in e＋e-→π＋π-J/ψ has a fine structure in it.The cross sections of e＋e-→π＋π-hc at center-of-mass energies from 3.90 to 4.42 GeV were measured by the BESIII and the CLEO-c experiments. Resonant structures are evident in the e＋e-→π＋π-hc line shape. The fit to the line shape results in a narrow structure at a mass of （4216±18） MeV/c2 and a width of （39±2） MeV, and a possible wide structure of mass （4293±9） MeV/c2 and width （222=k67） MeV. Here, the errors are combined statistical and systematic errors. This may indicate that the Y（4260） state observed in e＋e-→π＋π-J/ψ has a fine structure in it.

关 键 词：CHARMONIUM chramoniumlike states e＋e- annihilation EXOTICS HYBRIDS 

分 类 号：O572.2[理学—粒子物理与原子核物理]