2014/12/10 中国科学技术大学大一新生《科学与社会》研讨课 《反物质世界的探索》 Cand P&C Pon positronium CPy=(-1)s+w For =0 (S-wave): S=1 量子数 S=0 量子数 P=-1 P=1 C=-1 C=+1 CP=+1 CP=-1 “Ortho-positronium" “Para-positronium" 邦角 Cand P for a photo In QED -photon has J=S=1. -it can convert into a virtual S-wave ete pair for short times S-wave S=1 量子数 photon has same C&Pquantum numbers as an S=1 positronium =-1 G2-1 CP,=+1 物理学院叶邦角教授主讲 版权所有，严禁传播 62014/12/10 6  1 )1( ++  S  CP + - P =-1 C =-1 CP =+1 S=1 + - P = -1 C =+1 CP =-1 S=0 For ℓ=0 (S-wave): “Ortho-positronium” “Para-positronium” 量子数 量子数 In QED -photon has J=S=1. -it can convert into a virtual S-wave e+e- pair for short times   e+ e- S-wave S=1  photon has same C & P quantum numbers as an S=1 positronium P=-1 C=-1 CP=+1 量子数 中国科学技术大学大一新生《科学与社会》研讨课 《反物质世界的探索》 物理学院叶邦角教授主讲 版权所有， 严禁传播 叶邦角主讲