e − e + ¯ q q hadrons ( π ± , K ± , p, Λ 0 etc.) Figure 8.1: Hadronization Figure 8.2: A re-enactment of a single e $^{+}$e − collision detected at CERN 108 meaning that for every 10,000 collisions, it is seen fourteen times. Over the same number of collisions, we would have seen 918,000 π $^{0}$s. The creation of the ¯ qq pair in figure 8.1 immediately after the e $^{+}$e − Y X Z 200 . cm.  Cen t re o f sc reen i s ( 0 . 0000 , 0 . 0000 , 0 . 0000) 50 GeV 20 10 5  Run : even t 4093 : 1000 Da t e 930527 T ime 20716  Ebeam 45 . 658 Ev i s 99 . 9 Emi ss - 8 . 6 Vt x ( - 0 . 07 , 0 . 06 , - 0 . 80 )  Bz=4 . 350 Th r us t =0 . 9873 Ap l an=0 . 0017 Ob l a t =0 . 0248 Sphe r =0 . 0073 Ct r k (N= 39 Sump= 73 . 3 ) Eca l (N= 25 SumE= 32 . 6 ) Hca l (N=22 SumE= 22 . 6 ) Muon (N= 0 ) Sec Vt x (N= 3 ) Fde t (N= 0 SumE= 0 . 0 )