[u/mrichter/AliRoot.git] / JETAN / ua1_jet_finder.F

c
c => Original copy from /star/emc/shester/cl/pams/emc/jet/jet_finer_ua1.F
c
c:>------------------------------------------------------------------
C:ROUTINE:      subroutine jet_finder_ua1
C:DESCRIPTION:  UA1 jet algorithm from LUND JETSET
C:RETURN VALUE: ierror=1 on error
c:>------------------------------------------------------------------
      subroutine ua1_jet_finder(
     +        ncell, ncell_tot, etc, etac, phic,
     +        min_move, max_move, mode, prec_bg, ierror)
      implicit none ! 5-oct-2001

      real C_PI
      real C_2PI 
      real etaCellSize 
      real phiCellSize 
      real arg
      INTEGER NMAX,JMAX
      parameter(NMAX=60000,JMAX=100) ! 10-oct-2201
      integer ncell, ierror, mode, ncell_tot
      real etc(NMAX),etac(NMAX),phic(NMAX)
      real cone_rad, et_seed, ej_min, et_min
      real min_move, max_move, prec_bg
      integer flag(NMAX),index(NMAX)
      integer n_iter,i,j,k,l,nc
      real et_sum,et_ave,et_sum_old
      real et,eta,phi,eta0,phi0,etab,phib,ets,etas,phis
      real deta,dphi,r_int
!
      real occupationAll, occupationInJet  ! 3-oct-2001 by PAI 
      integer maxTowerInJet                ! 5-oct-2001 by PAI
      save    maxTowerInJet                ! This is obligatory
      integer idPerfomance
      data    idPerfomance /119/
      save    idPerfomance
!  print parameter - 27-sep-2001 by PAI
      integer kpri
      data    kpri /0/
      integer njet, ncellj
      real    etj, etaj, phij, etavg
*    Results
      COMMON /UA1JETS/ NJET, ETJ(100), ETAJ(100,2), PHIJ(100,2), 
     +     NCELLJ(100), ETAVG
*    Cell Geometry
      COMMON /UA1CELL/ etaCellSize, phiCellSize
*    Parameters
      COMMON /UA1PARA/ cone_rad, et_seed, ej_min, et_min

      C_PI  = 3.1415926
      C_2PI = 2.*C_PI

      if(kpri.eq.0) then
        kpri = 1
! for add. correction of jet energy if ocupation in jet not 100% !!
! may differ from real number because grid 
        maxTowerInJet=
     +       int((C_PI*cone_rad*cone_rad)/(etaCellSize*phiCellSize)+0.5)
        print 1, ncell_tot
     +       ,cone_rad, et_seed, ej_min, et_min
     +       ,min_move, max_move, mode, prec_bg
     +       ,maxTowerInJet
 1    format(/
     +    '    == jet_finder_UA1 ==  '/
     +    ' ncell_tot                   ', i5/
     +    ' cone rad                    ', f5.2/
     +    ' et_seed                     ', f5.2,' GeV/C'/
     +    ' ej_min                      ', f5.2,' GeV/C'/
     +    ' et_min(tower after bg sub.) ', f5.2,' GeV/C'/
     +    ' min_cone_move               ', f5.3/
     +    ' max_cone_move               ', f5.3/
     +    ' Mode for BG subtraction     ', i5/
     +    ' prec_bg                     ', f5.4/
     +    ' -- PAI"s addition --'/
     +    ' maxTowerInJet               ', i5/
     +    ' -- '/
     +    )
        if(NMAX .lt. ncell_tot) then
          print 2, NMAX, ncell_tot
 2    format('<E> you must increase memory -> NMAX ',i6
     +      ,' ncell_tot ', i6)
        endif 
      endif
      occupationAll = float(ncell) / float(ncell_tot)
! print parameter - 27-sep-2001 by PAI
      ierror =0
      n_iter =0
c*-sort cells by Et decending order, store the order in index
      call sortzv(etc,index,ncell,-1,1,0)   
c*-sum up total energy of all cells
      if(mode .eq. 1) then
         n_iter=1
         et_sum=0.0
         do i=1, ncell
            et_sum=et_sum+etc(i)
         enddo
         et_sum_old=et_sum
         et_ave=et_sum/float(ncell_tot)
      else
         et_ave=0.0
      endif
      print *,'Iter ', n_iter, ' et_ave ', et_ave, ' #cells ', ncell 
c*-Watch out!!! For mode=1, it can jump back to here for next iteration!!!
 999  continue
c*-kill cells (flag=2) with Et below ET_MIN after background subtraction
cfca      call vzero(flag,ncell)
      do i=1, ncell
         flag(i)=0
         if(etc(i)-et_ave .le. et_min) flag(i)=2
      enddo
      njet = 0
c*-Initiator cell is the one with highest Et of not yet used ones
      i=1
      j=index(i)
      if(i.eq.1. and. etc(j).lt.et_seed) then
        if(mode.eq.0 .or. (mode.eq.1 .and. n_iter.eq.1)) then
          print *,' no cell with Et higher than et_seed ->', etc(j)       
          return
        endif
      endif 
      do while(etc(j) .ge. et_seed)
         if(flag(j) .eq. 0) then
C         write(6,*) j, etc(j), et_seed, etac(j), phic(j), flag(j) 
         
            et =etc(j)-et_ave
            eta=etac(j)
            phi=phic(j)
            eta0=eta
            phi0=phi
            etab=eta
            phib=phi
            ets =0.0
            etas=0.0
            phis=0.0
c*-weighted eta and phi. 
            do k = 1, ncell
               l = index(k)
               if(flag(l).eq.0) then
                  deta = etac(l)-eta
c*-Is the cell is in the cone?
                  if(abs(deta).le.cone_rad)then
                     dphi=phic(l)-phi
                     do while(dphi .gt. C_PI)
                        dphi=dphi-C_2PI
                     enddo
                     do while(dphi .le. -C_PI)
                        dphi=dphi+C_2PI
                     enddo
                     if(abs(dphi).le.cone_rad) then
                        r_int=sqrt(deta**2+dphi**2)
                        if(r_int.le.cone_rad)then
c*-calculate offset from initiate cell
                           deta=etac(l)-eta0
                           dphi=phic(l)-phi0
                           do while(dphi .gt. C_PI)
                              dphi=dphi-C_2PI
                           enddo
                           do while(dphi .lt. -C_PI)
                              dphi=dphi+C_2PI
                           enddo
                           et=etc(l)-et_ave
                           etas=etas+abs(et)*deta
                           phis=phis+abs(et)*dphi
                           ets =ets +et
c*-New weighted eta and phi including this cell
                           eta=eta0+etas/ets
                           phi=phi0+phis/ets                          
c*-If cone does not move much from previous cone, just go next step
                           r_int=sqrt((eta-etab)**2+(phi-phib)**2)
                           if(r_int .le. min_move) then
                              goto 159
                           endif
c*-Cone should not move more than MAX_CONE_MOVE from initiator cell
                           r_int=sqrt((etas/ets)**2+(phis/ets)**2)              
                           if(r_int .ge. max_move) then
                              eta=etab
                              phi=phib
                              goto 159
                           endif
c*-Store this loop information
                           etab=eta
                           phib=phi
                        endif
                     endif
                  endif
               endif
            enddo
 159        continue 
            
c*-sum up unused cells within required distance of given eta/phi
            nc=0
            ets=0.0
            etas=0.0
            phis=0.0
            do k=1,ncell
               l=index(k)
               if(flag(l) .eq. 0) then
                  deta=etac(l)-eta
                  if(abs(deta).le.cone_rad)then
                     dphi=phic(l)-phi
                     do while(dphi .gt. C_PI)
                        dphi=dphi-C_2PI
                     enddo
                     do while(dphi .le. -C_PI)
                        dphi=dphi+C_2PI
                     enddo
                     if(abs(dphi).le.cone_rad) then
                        r_int=sqrt(deta**2+dphi**2)
                        if(r_int.le.cone_rad)then
                           flag(l)=-1
                           et  =etc(l)-et_ave
                           ets =ets +et
                           etas=etas+et*deta
                           phis=phis+et*dphi
                           nc  = nc + 1
                        endif
                     endif
                  endif
               endif
            enddo  ! do k=1,ncell
!  5-oct-2001 by PAI - remove 20-feb-2002 by PAI
! 20-feb-2002 - it is work if you apply cut on eT before jet finder !!!
!            if(maxTowerInJet .gt. nc) then
!              ets = ets - et_ave*(maxTowerInJet - nc) 
!            endif
! 5-oct-2001 by PAI
            
c*-reject cluster below minimum Ej_min
c* protection (am)

c            arg = 0.
c            if (ets .ne. 0.) then
c               if (abs(etas/ets) .lt. 23.719) then
c                  arg = ets * cosh(etas/ets)
c               else
c                  arg = 1.e10
c               endif
c            endif
            
            if(ets .lt. ej_min) then
               do k=1,ncell
                  if(flag(k).le.0) flag(k)=0
               enddo
            else
c*-eles, store flags and jet variables
               do k=1,ncell
                  if(flag(k).eq.-1) flag(k)=1
               enddo
               etas=eta+etas/ets
               phi=phi+phis/ets
               do while(phi .ge. C_2PI)
                  phi=phi-C_2PI
               enddo
               do while(phi .lt. 0.0)
                  phi=phi+C_2PI
               enddo
               njet=njet+1
               etj(njet) =ets
               etaj(njet,1)=eta0
               phij(njet,1)=phi0
               etaj(njet,2)=etas
               phij(njet,2)=phi
               ncellj(njet)=nc
               etavg = et_ave
            endif 
         endif
         i=i+1
         j=index(i)        
      enddo
      
c*-recalculate energy sum excluding used cells.
      if(mode.eq.1)then
         et_sum=0.0
         nc=0       ! #cells in jets
         do i=1,ncell
            if(flag(i).ne.1) then  ! 1 if cell in jet
               et_sum=et_sum+etc(i)
            else
               nc=nc+1
            endif
         enddo
c*-if background level changes more than prec_bg, go next iteration!!!
c*-after 10 iteration, stop working and finish
         if( (et_sum .gt. 0.) 
     +        .and. (abs(et_sum-et_sum_old)/et_sum.gt.prec_bg 
     +        .and. n_iter.le.10)
     +        .or. n_iter.eq.1) then ! minimum 2 iteration - 10-oct-2001 by pai
            et_ave=et_sum/float(ncell_tot-nc)
            n_iter=n_iter+1
            et_sum_old = et_sum
            print *,'End of iteration : et_ave ', et_ave, ' nc ', nc
     + , ' Jet energy ', ets     
            goto 999
c*-Watch out!!! Here is a big jump!!! 
         endif
         occupationInJet = float(ncell) / float(ncell_tot)
         write(*,*) njet,' jet found in ',n_iter,
     +     ' iteration(s) : EtSum, EtAve =',
     +     et_sum,et_sum/float(ncell_tot-nc)
     + , ' ncell_tot ', ncell_tot, ' #cell in jet ', nc
     + , ' occupationAll ', occupationAll
     + , ' occupationInJet ', occupationInJet
      endif
      
      if(njet.gt.100)then
         write(*,*)'UA1:Problem:More than 100 jets found!'
         ierror = 1
      elseif(njet.eq.0)then
         write(*,*)'UA1:Done:No jet found!'
      else
         write(*,*)
     +'UA1:Done:Found ',njet,' jet(s)'         
      end if
      return
      end
Commit	Line	Data
99e5fe42	1	c
	2	c => Original copy from /star/emc/shester/cl/pams/emc/jet/jet_finer_ua1.F
	3	c
	4	c:>------------------------------------------------------------------
	5	C:ROUTINE: subroutine jet_finder_ua1
	6	C:DESCRIPTION: UA1 jet algorithm from LUND JETSET
	7	C:RETURN VALUE: ierror=1 on error
	8	c:>------------------------------------------------------------------
	9	subroutine ua1_jet_finder(
	10	+ ncell, ncell_tot, etc, etac, phic,
	11	+ min_move, max_move, mode, prec_bg, ierror)
	12	implicit none ! 5-oct-2001
	13
	14	real C_PI
	15	real C_2PI
	16	real etaCellSize
	17	real phiCellSize
	18	real arg
	19	INTEGER NMAX,JMAX
	20	parameter(NMAX=60000,JMAX=100) ! 10-oct-2201
	21	integer ncell, ierror, mode, ncell_tot
	22	real etc(NMAX),etac(NMAX),phic(NMAX)
	23	real cone_rad, et_seed, ej_min, et_min
	24	real min_move, max_move, prec_bg
	25	integer flag(NMAX),index(NMAX)
	26	integer n_iter,i,j,k,l,nc
	27	real et_sum,et_ave,et_sum_old
	28	real et,eta,phi,eta0,phi0,etab,phib,ets,etas,phis
	29	real deta,dphi,r_int
	30	!
	31	real occupationAll, occupationInJet ! 3-oct-2001 by PAI
	32	integer maxTowerInJet ! 5-oct-2001 by PAI
	33	save maxTowerInJet ! This is obligatory
	34	integer idPerfomance
	35	data idPerfomance /119/
	36	save idPerfomance
	37	! print parameter - 27-sep-2001 by PAI
	38	integer kpri
	39	data kpri /0/
	40	integer njet, ncellj
83a444b1	41	real etj, etaj, phij, etavg
99e5fe42	42	* Results
99e5fe42	43	COMMON /UA1JETS/ NJET, ETJ(100), ETAJ(100,2), PHIJ(100,2),
83a444b1	44	+ NCELLJ(100), ETAVG
99e5fe42	45	* Cell Geometry
	46	COMMON /UA1CELL/ etaCellSize, phiCellSize
	47	* Parameters
	48	COMMON /UA1PARA/ cone_rad, et_seed, ej_min, et_min
	49
	50	C_PI = 3.1415926
	51	C_2PI = 2.*C_PI
	52
	53	if(kpri.eq.0) then
	54	kpri = 1
	55	! for add. correction of jet energy if ocupation in jet not 100% !!
	56	! may differ from real number because grid
	57	maxTowerInJet=
	58	+ int((C_PIcone_radcone_rad)/(etaCellSize*phiCellSize)+0.5)
	59	print 1, ncell_tot
	60	+ ,cone_rad, et_seed, ej_min, et_min
	61	+ ,min_move, max_move, mode, prec_bg
	62	+ ,maxTowerInJet
	63	1 format(/
	64	+ ' == jet_finder_UA1 == '/
	65	+ ' ncell_tot ', i5/
	66	+ ' cone rad ', f5.2/
	67	+ ' et_seed ', f5.2,' GeV/C'/
	68	+ ' ej_min ', f5.2,' GeV/C'/
	69	+ ' et_min(tower after bg sub.) ', f5.2,' GeV/C'/
	70	+ ' min_cone_move ', f5.3/
	71	+ ' max_cone_move ', f5.3/
	72	+ ' Mode for BG subtraction ', i5/
	73	+ ' prec_bg ', f5.4/
	74	+ ' -- PAI"s addition --'/
	75	+ ' maxTowerInJet ', i5/
	76	+ ' -- '/
	77	+ )
	78	if(NMAX .lt. ncell_tot) then
	79	print 2, NMAX, ncell_tot
	80	2 format('<E> you must increase memory -> NMAX ',i6
	81	+ ,' ncell_tot ', i6)
	82	endif
	83	endif
99e5fe42	84	occupationAll = float(ncell) / float(ncell_tot)
99e5fe42	85	! print parameter - 27-sep-2001 by PAI
	86	ierror =0
	87	n_iter =0
	88	c*-sort cells by Et decending order, store the order in index
	89	call sortzv(etc,index,ncell,-1,1,0)
	90	c*-sum up total energy of all cells
	91	if(mode .eq. 1) then
	92	n_iter=1
	93	et_sum=0.0
	94	do i=1, ncell
	95	et_sum=et_sum+etc(i)
	96	enddo
	97	et_sum_old=et_sum
	98	et_ave=et_sum/float(ncell_tot)
	99	else
	100	et_ave=0.0
	101	endif
	102	print *,'Iter ', n_iter, ' et_ave ', et_ave, ' #cells ', ncell
	103	c*-Watch out!!! For mode=1, it can jump back to here for next iteration!!!
	104	999 continue
	105	c*-kill cells (flag=2) with Et below ET_MIN after background subtraction
	106	cfca call vzero(flag,ncell)
	107	do i=1, ncell
	108	flag(i)=0
	109	if(etc(i)-et_ave .le. et_min) flag(i)=2
	110	enddo
	111	njet = 0
	112	c*-Initiator cell is the one with highest Et of not yet used ones
	113	i=1
	114	j=index(i)
	115	if(i.eq.1. and. etc(j).lt.et_seed) then
	116	if(mode.eq.0 .or. (mode.eq.1 .and. n_iter.eq.1)) then
99e5fe42	117	print *,' no cell with Et higher than et_seed ->', etc(j)
	118	return
	119	endif
	120	endif
	121	do while(etc(j) .ge. et_seed)
	122	if(flag(j) .eq. 0) then
	123	C write(6,*) j, etc(j), et_seed, etac(j), phic(j), flag(j)
	124
	125	et =etc(j)-et_ave
	126	eta=etac(j)
	127	phi=phic(j)
	128	eta0=eta
	129	phi0=phi
	130	etab=eta
	131	phib=phi
	132	ets =0.0
	133	etas=0.0
	134	phis=0.0
	135	c*-weighted eta and phi.
	136	do k = 1, ncell
	137	l = index(k)
	138	if(flag(l).eq.0) then
	139	deta = etac(l)-eta
	140	c*-Is the cell is in the cone?
	141	if(abs(deta).le.cone_rad)then
	142	dphi=phic(l)-phi
	143	do while(dphi .gt. C_PI)
	144	dphi=dphi-C_2PI
	145	enddo
	146	do while(dphi .le. -C_PI)
	147	dphi=dphi+C_2PI
	148	enddo
	149	if(abs(dphi).le.cone_rad) then
	150	r_int=sqrt(deta2+dphi2)
	151	if(r_int.le.cone_rad)then
	152	c*-calculate offset from initiate cell
	153	deta=etac(l)-eta0
	154	dphi=phic(l)-phi0
	155	do while(dphi .gt. C_PI)
	156	dphi=dphi-C_2PI
	157	enddo
	158	do while(dphi .lt. -C_PI)
	159	dphi=dphi+C_2PI
	160	enddo
	161	et=etc(l)-et_ave
	162	etas=etas+abs(et)*deta
	163	phis=phis+abs(et)*dphi
	164	ets =ets +et
	165	c*-New weighted eta and phi including this cell
	166	eta=eta0+etas/ets
	167	phi=phi0+phis/ets
	168	c*-If cone does not move much from previous cone, just go next step
	169	r_int=sqrt((eta-etab)2+(phi-phib)2)
	170	if(r_int .le. min_move) then
	171	goto 159
	172	endif
	173	c*-Cone should not move more than MAX_CONE_MOVE from initiator cell
	174	r_int=sqrt((etas/ets)2+(phis/ets)2)
	175	if(r_int .ge. max_move) then
	176	eta=etab
	177	phi=phib
	178	goto 159
	179	endif
	180	c*-Store this loop information
181	etab=eta
182	phib=phi
183	endif
184	endif
185	endif
186	endif
187	enddo
188	159 continue
189
190	c*-sum up unused cells within required distance of given eta/phi
191	nc=0
192	ets=0.0
193	etas=0.0
194	phis=0.0
195	do k=1,ncell
196	l=index(k)
197	if(flag(l) .eq. 0) then
198	deta=etac(l)-eta
199	if(abs(deta).le.cone_rad)then
200	dphi=phic(l)-phi
201	do while(dphi .gt. C_PI)
202	dphi=dphi-C_2PI
203	enddo
204	do while(dphi .le. -C_PI)
205	dphi=dphi+C_2PI
206	enddo
207	if(abs(dphi).le.cone_rad) then
208	r_int=sqrt(deta2+dphi2)
209	if(r_int.le.cone_rad)then
210	flag(l)=-1
211	et =etc(l)-et_ave
212	ets =ets +et
213	etas=etas+et*deta
214	phis=phis+et*dphi
215	nc = nc + 1
216	endif
217	endif
218	endif
219	endif
220	enddo ! do k=1,ncell
221	! 5-oct-2001 by PAI - remove 20-feb-2002 by PAI
222	! 20-feb-2002 - it is work if you apply cut on eT before jet finder !!!
223	! if(maxTowerInJet .gt. nc) then
224	! ets = ets - et_ave*(maxTowerInJet - nc)
225	! endif
226	! 5-oct-2001 by PAI
227
228	c*-reject cluster below minimum Ej_min
229	c* protection (am)
83a444b1	230
	231	c arg = 0.
	232	c if (ets .ne. 0.) then
	233	c if (abs(etas/ets) .lt. 23.719) then
	234	c arg = ets * cosh(etas/ets)
	235	c else
	236	c arg = 1.e10
	237	c endif
	238	c endif
99e5fe42	239
83a444b1	240	if(ets .lt. ej_min) then
99e5fe42	241	do k=1,ncell
	242	if(flag(k).le.0) flag(k)=0
	243	enddo
99e5fe42	244	else
	245	c*-eles, store flags and jet variables
	246	do k=1,ncell
	247	if(flag(k).eq.-1) flag(k)=1
	248	enddo
83a444b1	249	etas=eta+etas/ets
99e5fe42	250	phi=phi+phis/ets
	251	do while(phi .ge. C_2PI)
	252	phi=phi-C_2PI
	253	enddo
	254	do while(phi .lt. 0.0)
	255	phi=phi+C_2PI
	256	enddo
	257	njet=njet+1
	258	etj(njet) =ets
	259	etaj(njet,1)=eta0
	260	phij(njet,1)=phi0
	261	etaj(njet,2)=etas
	262	phij(njet,2)=phi
	263	ncellj(njet)=nc
83a444b1	264	etavg = et_ave
99e5fe42	265	endif
	266	endif
	267	i=i+1
	268	j=index(i)
	269	enddo
	270
	271	c*-recalculate energy sum excluding used cells.
	272	if(mode.eq.1)then
	273	et_sum=0.0
	274	nc=0 ! #cells in jets
	275	do i=1,ncell
	276	if(flag(i).ne.1) then ! 1 if cell in jet
	277	et_sum=et_sum+etc(i)
	278	else
	279	nc=nc+1
	280	endif
	281	enddo
	282	c*-if background level changes more than prec_bg, go next iteration!!!
	283	c*-after 10 iteration, stop working and finish
	284	if( (et_sum .gt. 0.)
	285	+ .and. (abs(et_sum-et_sum_old)/et_sum.gt.prec_bg
	286	+ .and. n_iter.le.10)
	287	+ .or. n_iter.eq.1) then ! minimum 2 iteration - 10-oct-2001 by pai
	288	et_ave=et_sum/float(ncell_tot-nc)
	289	n_iter=n_iter+1
	290	et_sum_old = et_sum
	291	print *,'End of iteration : et_ave ', et_ave, ' nc ', nc
	292	+ , ' Jet energy ', ets
	293	goto 999
	294	c*-Watch out!!! Here is a big jump!!!
	295	endif
	296	occupationInJet = float(ncell) / float(ncell_tot)
99e5fe42	297	write(,) njet,' jet found in ',n_iter,
	298	+ ' iteration(s) : EtSum, EtAve =',
	299	+ et_sum,et_sum/float(ncell_tot-nc)
	300	+ , ' ncell_tot ', ncell_tot, ' #cell in jet ', nc
	301	+ , ' occupationAll ', occupationAll
	302	+ , ' occupationInJet ', occupationInJet
	303	endif
	304
	305	if(njet.gt.100)then
	306	write(,)'UA1:Problem:More than 100 jets found!'
	307	ierror = 1
	308	elseif(njet.eq.0)then
	309	write(,)'UA1:Done:No jet found!'
	310	else
	311	write(,)
	312	+'UA1:Done:Found ',njet,' jet(s)'
	313	end if
	314	return
	315	end
	316
	317
	318