Analytical formula for the cross section of hadron production from e^(+)e^(−) collisions around the narrow charmouinum resonances  

作　　者：Ya-Nan Wang Ya-Di Wang Ping Wang 王亚男;王雅迪;王平(North China Electric Power Unversity,Beijing 102206,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]North China Electric Power Unversity,Beijing 102206,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2024年第11期43-51,共9页中国物理C（英文版）

摘　　要：The paper reports an analytical formula for the production cross section of e^(+)e^(−)annihilation to hadrons in the vicinity of a narrow resonance,particularly in theτ-charm region,while considering initial state radiation.Despite some approximations in its derivation,comparison between the analytical formula and direct integration of ISR shows good accuracy,indicating that the analytical formula meets current experimental requirements.Furthermore,this paper presents a comparison of the cross section between the analytical formula and calculations using the ConExc Monte Carlo generator.The efficiency of the analytical formula in significantly reducing computing time makes it a favorable choice for the regression procedure to extract the parameters of narrow charmonium resonances in experiments.

关 键 词：initial state radiation production cross section observed cross section analytic form 

分 类 号：O572.3[理学—粒子物理与原子核物理]