Stand-alone library for ESD. Possibility to use only root and lidESD.so for analysis...

[u/mrichter/AliRoot.git] / HIJING / hipyset1_35 / lufowo_hijing.F

* $Id$
    
C*********************************************************************  
    
      SUBROUTINE LUFOWO_HIJING(H10,H20,H30,H40)    
    
C...Purpose: to calculate the first few Fox-Wolfram moments.    
#include "lujets_hijing.inc"
#include "ludat1_hijing.inc"
#include "ludat2_hijing.inc"
    
C...Copy momenta for particles and calculate H0.    
      NP=0  
      H0=0. 
      HD=0. 
      DO 110 I=1,N  
      IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 110  
      IF(MSTU(41).GE.2) THEN    
        KC=LUCOMP_HIJING(K(I,2))   
        IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.  
     &  KC.EQ.18) GOTO 110  
        IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE_HIJING(K(I,2))
     $       .EQ.0)GOTO 110    
      ENDIF 
      IF(N+NP.GE.MSTU(4)-MSTU(32)-5) THEN   
         CALL LUERRM_HIJING(11
     $        ,'(LUFOWO_HIJING:) no more memory left in LUJETS_HIJING')   
        H10=-1. 
        H20=-1. 
        H30=-1. 
        H40=-1. 
        RETURN  
      ENDIF 
      NP=NP+1   
      DO 100 J=1,3  
  100 P(N+NP,J)=P(I,J)  
      P(N+NP,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2) 
      H0=H0+P(N+NP,4)   
      HD=HD+P(N+NP,4)**2    
  110 CONTINUE  
      H0=H0**2  
    
C...Very low multiplicities (0 or 1) not considered.    
      IF(NP.LE.1) THEN  
         CALL LUERRM_HIJING(8
     $        ,'(LUFOWO_HIJING:) too few particles for analysis')   
        H10=-1. 
        H20=-1. 
        H30=-1. 
        H40=-1. 
        RETURN  
      ENDIF 
    
C...Calculate H1 - H4.  
      H10=0.    
      H20=0.    
      H30=0.    
      H40=0.    
      DO 120 I1=N+1,N+NP    
      DO 120 I2=I1+1,N+NP   
      CTHE=(P(I1,1)*P(I2,1)+P(I1,2)*P(I2,2)+P(I1,3)*P(I2,3))/   
     &(P(I1,4)*P(I2,4)) 
      H10=H10+P(I1,4)*P(I2,4)*CTHE  
      H20=H20+P(I1,4)*P(I2,4)*(1.5*CTHE**2-0.5) 
      H30=H30+P(I1,4)*P(I2,4)*(2.5*CTHE**3-1.5*CTHE)    
      H40=H40+P(I1,4)*P(I2,4)*(4.375*CTHE**4-3.75*CTHE**2+0.375)    
  120 CONTINUE  
    
C...Calculate H1/H0 - H4/H0. Output.    
      MSTU(61)=N+1  
      MSTU(62)=NP   
      H10=(HD+2.*H10)/H0    
      H20=(HD+2.*H20)/H0    
      H30=(HD+2.*H30)/H0    
      H40=(HD+2.*H40)/H0    
    
      RETURN    
      END