4 *CMZ :- -26/04/91 11.11.56 by Bryan Webber
6 *-- Author : Bryan Webber
8 C-----------------------------------------------------------------------
10 FUNCTION HWUPCM(EM0,EM1,EM2)
12 C-----------------------------------------------------------------------
14 C C.M. MOMENTUM FOR DECAY MASSES EM0 -> EM1 + EM2
16 C SET TO -1 BELOW THRESHOLD
18 C-----------------------------------------------------------------------
20 DOUBLE PRECISION HWUPCM,EM0,EM1,EM2,EMS,EMD
26 IF (EM0.LT.EMS.OR.EM0.LT.EMD) THEN
30 ELSEIF (EM0.EQ.EMS.OR.EM0.EQ.EMD) THEN
36 HWUPCM=SQRT((EM0+EMD)*(EM0-EMD)*
38 & (EM0+EMS)*(EM0-EMS))*.5/EM0