--- /dev/null
+#include "isajet/pilot.h"
+ SUBROUTINE SSHHX
+C-----------------------------------------------------------------------
+C Calculates the decays Hi -> Hj + X.
+C
+C Includes vertex corrections for triple Higgs couplings due
+C to top and stop quarks effects.
+C See Kunszt and Zwirner CERN-TH.6150/91 for all but hh-hc-hc
+C correction which is in our Higgs-->SUSY paper:
+C Baer et. al. FSU-HEP-920630 or UH-511-749-92.
+C
+C The hh-hl-hl vertex correction now includes both
+C top & bottom and stop and sbottom squark
+C (non-degenerate with mixing) effects.
+C A-terms and mu=-2m1 are also included.
+C
+C
+C Bisset's HIGPRO
+C-----------------------------------------------------------------------
+#if defined(CERNLIB_IMPNONE)
+ IMPLICIT NONE
+#endif
+#include "isajet/sspar.inc"
+#include "isajet/sssm.inc"
+#include "isajet/sstype.inc"
+C
+ DOUBLE PRECISION PI,SR2,G2,GP2,BETA,ALPHA,SW2,CW2,LGTST,CBMA
+ $,SBMA,LAMB1,DWID,DELLPP,MH,M1,M2,LAMB,TEMP,DTEMPL,DTEMPR
+ $,DELHLL,DELHPP,DELHCC,CAB2,SAB2
+ DOUBLE PRECISION SSDLAM
+ REAL WID,ASMT,MTMT,MTQ,SUALFS,HIGFRZ
+ DOUBLE PRECISION SSMQCD
+C
+ PI=4.*ATAN(1.D0)
+ SR2=SQRT(2.D0)
+ G2=4.0*PI*ALFAEM/SN2THW
+ GP2=4*PI*ALFAEM/(1-SN2THW)
+ HIGFRZ=SQRT(AMTLSS*AMTRSS)
+ ASMT=SUALFS(AMTP**2,.36,AMTP,3)
+ MTMT=AMTP/(1.+4*ASMT/3./PI+(16.11-1.04*(5.-6.63/AMTP))*
+ $(ASMT/PI)**2)
+ MTQ=SSMQCD(DBLE(MTMT),DBLE(HIGFRZ))
+
+ BETA=ATAN(1.0/RV2V1)
+ ALPHA=ALFAH
+ SW2=SN2THW
+ CW2=1.-SN2THW
+C
+ LGTST=(1+(AMTLSS/MTQ)**2)*(1+(AMTRSS/MTQ)**2)
+ LGTST=LOG(LGTST)
+ SBMA=SIN(BETA-ALPHA)
+ CBMA=COS(BETA-ALPHA)
+ CAB2=(DCOS(ALPHA+BETA))**2
+ SAB2=1.0-CAB2
+C
+C hl0 -> ha0 + ha0
+C
+ IF(AMHL.GT.2*AMHA) THEN
+ LAMB1=AMHL**2-4.0*AMHA**2
+ DWID=SBMA*COS(2.0*BETA)
+C Now add hl-hp-hp vertex correction
+ DELLPP=3.0*G2*CW2*(MTQ**4)*COS(ALPHA)
+ DELLPP=DELLPP*(COS(BETA)**2)/(16.0*(PI**2))
+ DELLPP=DELLPP/((AMW**4)*(SIN(BETA))**3)
+ DELLPP=DELLPP*LGTST
+ DWID=(DWID+DELLPP)**2
+ DWID=DWID*G2*(AMZ**2)/(128.0*PI*CW2*(AMHL**2))
+ DWID=DWID*SQRT(LAMB1)
+ WID=DWID
+ CALL SSSAVE(ISHL,WID,ISHA,ISHA,0,0,0)
+ ENDIF
+C
+C hh -> ha + z
+C
+ IF(AMHH.GT.AMHA+AMZ) THEN
+ MH=AMHH
+ M1=AMHA
+ M2=AMZ
+ LAMB=SSDLAM(MH**2,M1**2,M2**2)
+ DWID=SQRT(G2*CW2)+SQRT(GP2*SW2)
+ DWID=DWID**2*SAB2*SQRT(LAMB)
+ DWID=DWID/(64.0*PI*(AMZ**2)*(AMHH**3))
+ DWID=DWID*LAMB
+ WID=DWID
+ CALL SSSAVE(ISHH,WID,ISHA,IDZ,0,0,0)
+ ENDIF
+C
+C hh -> hl + hl
+C
+ IF(AMHH.GT.2*AMHL) THEN
+ LAMB1=AMHH**2-4.0*AMHL**2
+ TEMP=CBMA*COS(2.0*ALPHA)
+ TEMP=TEMP+2.0*SBMA*SIN(2.0*ALPHA)
+C
+C Now add hh-hl-hl vertex correction
+C
+C The following 8 lines calculate the radiative
+C hh-hl-hl vertex correction including only
+C effects from tops and stop squarks.
+C
+C DTEMPL=3.0*LOG(1.0+(AMTLSS/MTQ)**2)
+C DTEMPL=DTEMPL-2.0*AMTLSS**2/(AMTLSS**2+MTQ**2)
+C DTEMPR=3.0*LOG(1.0+(AMTRSS/MTQ)**2)
+C DTEMPR=DTEMPR-2.0*AMTRSS**2/(AMTRSS**2+MTQ**2)
+C DELHLL=3.0*G2*CW2*(MTQ**4)*SIN(ALPHA)
+C DELHLL=DELHLL*(COS(ALPHA)**2)/(PI**2)
+C DELHLL=DELHLL/(16.0*(AMW**4)*(SIN(BETA))**3)
+C DELHLL=DELHLL*(DTEMPL+DTEMPR)
+C
+C The subroutine SSHL calculates the radiative
+C hh-hl-hl vertex correction including both
+C top & bottom and stop and sbottom squark
+C (non-degenerate with mixing) effects.
+C A-terms and mu=-2m1 are also included.
+C
+ CALL SSDHLL(DELHLL)
+C
+C Note: the variable TEMP in the line below
+C this is the Lagrangian term (as noted on
+C page 27 of Prof. Tata's personal Lagrangian
+C term notes. Thus DELHLL must also be the
+C Lagrangian entry - not the potential entry.
+C The subroutine SSHLL IS set up to yield the
+C the Lagrangian entry. (We must be very careful
+C about the relative sign between TEMP and DELHLL.)
+C
+ DWID=G2*(AMZ**2)*(TEMP+DELHLL)**2
+ DWID=DWID/(128.0*PI*CW2*(AMHH**2))
+ DWID=DWID*SQRT(LAMB1)
+ WID=DWID
+ CALL SSSAVE(ISHH,WID,ISHL,ISHL,0,0,0)
+ ENDIF
+C
+C hh -> ha + ha
+C
+ IF(AMHH.GT.2*AMHA) THEN
+ LAMB1=AMHH**2-4.0*AMHA**2
+ DWID=CBMA*COS(2*BETA)
+C Now add hh-hp-hp vertex correction
+ DELHPP=3.0*G2*CW2*(MTQ**4)*SIN(ALPHA)
+ DELHPP=DELHPP*(COS(BETA)**2)/(16.0*(PI**2))
+ DELHPP=DELHPP/((AMW**4)*(SIN(BETA))**3)
+ DELHPP=DELHPP*LGTST
+ DWID=G2*(AMZ**2)*(DWID+DELHPP)**2
+ DWID=DWID/(128.0*PI*CW2*(AMHH**2))
+ DWID=DWID*SQRT(LAMB1)
+ WID=DWID
+ CALL SSSAVE(ISHH,WID,ISHA,ISHA,0,0,0)
+ ENDIF
+C
+C hh -> hc+ + hc-
+C
+ IF(AMHH.GT.2*AMHC) THEN
+ LAMB1=1.0-4.0*(AMHC**2)/(AMHH**2)
+ DWID=CBMA*COS(2.0*BETA)/(2.0*CW2)
+ DWID=COS(BETA+ALPHA)-DWID
+C Now add hh-hc-hc vertex correction
+ DELHCC=3.0*G2*MTQ**4*SIN(ALPHA)
+ DELHCC=DELHCC/( SIN(BETA)*(DTAN(BETA))**2 )
+ DELHCC=DELHCC/(32.0*PI**2*AMW**4)
+ DELHCC=DELHCC*LGTST
+ DWID=G2*AMW**2*(-DWID+DELHCC)**2
+ DWID=DWID*SQRT(LAMB1)/(16.0*PI*AMHH)
+ WID=DWID
+ CALL SSSAVE(ISHH,WID,ISHC,-ISHC,0,0,0)
+ ENDIF
+C
+C ha -> hl + z
+C
+ IF(AMHA.GT.AMHL+AMZ) THEN
+ MH=AMHA
+ M1=AMHL
+ M2=AMZ
+ LAMB=SSDLAM(MH**2,M1**2,M2**2)
+ DWID=SQRT(G2*CW2)+SQRT(GP2*SW2)
+ DWID=DWID**2*CAB2*SQRT(LAMB)
+ DWID=DWID/(64.0*PI*(AMZ**2)*(AMHA**3))
+ DWID=DWID*LAMB
+ WID=DWID
+ CALL SSSAVE(ISHA,WID,ISHL,IDZ,0,0,0)
+ ENDIF
+C
+C hc+ -> w+ + hl
+C
+ IF(AMHC.GT.AMW+AMHL) THEN
+ MH=AMHC
+ M1=AMW
+ M2=AMHL
+ LAMB=SSDLAM(MH**2,M1**2,M2**2)
+ DWID=G2*CAB2*SQRT(LAMB)
+ DWID=DWID/( 64.0*PI*(AMW**2)*(AMHC**3) )
+ DWID=DWID*LAMB
+ WID=DWID
+ CALL SSSAVE(ISHC,WID,ISHL,IDW,0,0,0)
+ ENDIF
+C
+ RETURN
+ END
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