supported in part by the National Natural Science Foundation of China(11835015,11947302,11961141012;11621131001(the Sino-German Collaborative Research Center CRC110"Symmetries and the Emergence of Structure in QCD"));the Chinese Academy of Sciences(XDB34030303and QYZDB-SSW-SYS013);the CAS Center for Excellence in Particle Physics(CCEPP)。
In high energy physics.decay widths and cross sections areamong the most important physical observables.and the computa-tion of each of them contains a phase space integration.Therefore,the phase space integration is ...