CDECK  ID>, HWDRM3.

*CMZ :-        -20/07/99  10:56:12  by  Peter Richardson

*-- Author :    Peter Richardson

C-----------------------------------------------------------------------

      FUNCTION HWDRM3(X,MA,MB,MC,MD,MR1,MR2,GAM1,GAM2,A1,A2,B1,B2)

C-----------------------------------------------------------------------

C     Function to compute the light/heavy interference part of a 3-body

C     R-parity decay

C-----------------------------------------------------------------------

      IMPLICIT NONE

      DOUBLE PRECISION X,MA,MB,MC,MD,A1,A2,B1,B2,HWDRM3,MR1,MR2,GAM1

     &                 ,GAM2

C

      HWDRM3  = 2*(X - MA**2 - MB**2)*(2*(A2*B1 + A1*B2)*MC*MD +

     &    (A1*A2 + B1*B2)*(-X + MC**2 + MD**2))*

     &  (GAM1*GAM2*MR1*MR2 + (X - MR1**2)*(X - MR2**2))/

     &  (((X-MR1**2)**2+GAM1**2*MR1**2)*((X-MR2**2)**2+GAM2**2*MR2**2))

      END