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hiboost.f
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file hiboost.f
1 C
2 C
3 C
4 C
5  SUBROUTINE hiboost
6  IMPLICIT DOUBLE PRECISION(d)
7  common/lujets/n,k(9000,5),p(9000,5),v(9000,5)
8  SAVE /lujets/
9  common/ludat1/mstu(200),paru(200),mstj(200),parj(200)
10  SAVE /ludat1/
11  common/hiparnt/hipr1(100),ihpr2(50),hint1(100),ihnt2(50)
12  SAVE /hiparnt/
13  DO 100 i=1,n
14  dbeta=p(i,3)/p(i,4)
15  IF(abs(dbeta).GE.1.d0) THEN
16  db=hint1(2)
17  IF(db.GT.0.99999999d0) THEN
18 C ********Rescale boost vector if too close to unity.
19  WRITE(6,*) '(HIBOOT:) boost vector too large'
20  db=0.99999999d0
21  ENDIF
22  dga=1d0/sqrt(1d0-db**2)
23  dp3=p(i,3)
24  dp4=p(i,4)
25  p(i,3)=(dp3+db*dp4)*dga
26  p(i,4)=(dp4+db*dp3)*dga
27  go to 100
28  ENDIF
29  y=0.5*dlog((1.d0+dbeta)/(1.d0-dbeta))
30  amt=sqrt(p(i,1)**2+p(i,2)**2+p(i,5)**2)
31  p(i,3)=amt*sinh(y+hint1(3))
32  p(i,4)=amt*cosh(y+hint1(3))
33 100 CONTINUE
34  RETURN
35  END