报告题目：Dilepton production in relativistic energies
　　报告人：Prof. Gyorgy Wolf　　Wigner Research Center for Physics
　　时间安排：2016年12月15日15:00
　　地点：中国科学院近代物理研究所5号楼1008会议室
　　报告摘要:
　　We calculate electron-positron pair production in relativistic energies in heavy ion and pion-nucleon and pion-nucleus collisions. We derive the elementary cross sections in an effective field theory approach. Parameters of the model are fitted to pion photoproduction data. We show that the model describes HADES date well, and show that at FAIR and NICA energies the phi meson is a very interesting observable. In \pi-nucleus reactions we investigate especially the effect of the interference term of the \rho and \omega mesons on the dilepton spectra. These results are meant to give predictions for the planned experiments at the HADES spectrometer in GSI, Darmstadt and in JPARC.