CERN Program Library Long Writeup W5013 - CERNLIB ...

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2 Method • Upon entry to GDECAY a binary search is made in a list of parent particles. This list is stored in the JPART structure and currently contains the particles defined in GPART [CONS300]. If the current particle cannot be found in the list, control is returned without any decay generation. Up to six decay modes and their corresponding branching ratios are then extracted from the JPART data banks (see [CONS310]). • A decay channel is selected according to the branching ratios. If the sum of the branching ratios for a particle is not equal 100%, it is possible that no decay is selected. • Depending on whether the two- or three-body decay is selected, either GDECA2 or GDECA3 is called to generate the four-momenta of the decay products with isotropic angular distribution in the center-ofmass system. • The momentum vectors of the decay products are transformed into the laboratory system and rotated back into the GEANT coordinate frame. The kinematics of the products is stored in the common /GCKING/. • When a particle decays and no branching ratio is defined, then GDECAY calls the user routine GUDCAY. PHYS400 – 2 294
Geant 3.16 GEANT User’s Guide PHYS410 Origin : M. Hansroul Submitted: 01.09.76 Revision : Revised: 16.12.93 Documentation : 1 Subroutines Rotations and Lorentz transformation CALL GLOREN (BETA,PA,PB*) GLOREN transforms the momentum and the energy from one Lorentz frame (A) to another (B). It uses the following input and output: BETA(4) PA(4) PB(4) (REAL) velocity components in light units of frame B in frame A, BETA(1...3) = ⃗ β, BETA(4)= (1 − β 2 ) −1/2 = γ; (REAL) momentum components in the frame (A); (REAL) momentum components in the frame (B). GLOREN is called from the routine GDECAY. The momentum ⃗p A and energy E A in reference frame A are transformed into the momentum ⃗p B and energy E B in reference frame B which translates with velocity ⃗ β with respect to A: E B = γ(E A − β ⃗ · ⃗p A ) ( ) ⃗p B = ⃗p A + γβ ⃗ γβ ⃗ · ⃗pA γ +1 − E A CALL GDROT (P*,COSTH,SINTH,COSPH,SINPH) GDROT rotates a vector from one reference system to another. P(3) COSTH SINTH COSPH SINPH (REAL) vector to rotate, overwritten on output; (REAL) cosine of the polar angle; (REAL) sine of the polar angle; (REAL) cosine of the azimuthal angle; (REAL) sine of the azimuthal angle; GDROT is called from several routines to rotate a particle from in the center-of-mass system to the GEANT (laboratory) system. The following rotation matrix is used: ⎛ ⎜ ⎝ cos θ cos φ − sin φ sin θ cos φ cos θ sin φ cos φ sin θ sin φ − sin θ 0 cosθ ⎞ ⎛ ⎟ ⎠ = ⎜ ⎝ cos φ − sin φ 0 sin φ cos φ 0 } 0 0 {{ 1 } R φ ⎞ ⎛ ⎞ cos θ 0 sinθ ⎟ ⎜ ⎠ ⎝ 0 1 0 ⎟ ⎠ } − sin θ 0 {{ cosθ } R θ R θ is a counterclockwise rotation around axis y by an angle θ, and R φ is a counterclockwise rotation around axis z ′ (rotated by an angle θ from the initial position) by an angle φ. 295 PHYS410 – 1
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CERN Program Library Long Writeup W
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Chapter 1: Catalog of Geant section
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IOPA500 KINE001 KINE100 KINE199 KIN
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Geant 3.21 GEANT User’s Guide AAA
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The routines made available for GEA
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outines, then you can type the foll
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AAAA Bibliography [1] H.J. Klein an
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2 Event simulation framework The fr
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• after each tracking step along
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GUDIGI GUOUT GTRIGC UGLAST GLAST GU
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Particles JPART Materials JMATE/JTM
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3 Summary of GEANT data records 3.1
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3.4 User applications KEY N I VAR S
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Geant 3.16 GEANT User’s Guide BAS
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SUBROUTINE UGEOM + (’TGT ’,2,
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LQ(JHEAD-1) user link IQ(JHEAD+1) I
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VALUE = GARNDM (DUMMY) DUMMY (REAL)
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Geant 3.16 GEANT User’s Guide CON
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1 Energy binning IDECAD Bin number
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Particle No. Mass(GeV) Charge Life
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¯Ω + ¯Ξ 0 π + 23.60 ¯ΛK + 67
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Geant 3.16 GEANT User’s Guide DRA
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The main drawing routines are: GDRA
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Another feature which is available
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z y x C CHARACTER*4 CHNAMS(5) INTEG
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CALL GDRAWC(’OPAL’,2,0.,10.,10.
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CALL GSATT(’HB’,’FILL’,3) C
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CALL GDRAW(’CAVE’,40.,40.,0.,10
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Figure 16: Example of use of GDSPEC
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CALL GDOPEN(3) CALL GDRAWC(’ALEF
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6 NKVIEW IVIEW JDRAW NKVIEW JV = IB
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SHAD EDGE when HIDE is ON, selects
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x1xxxx 1xxxxx add the text EVENT NR
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DRAW Bibliography [1] R.Bock et al.
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2 Volumes with contents A volume ca
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0 1 2 1 0 1 0 1 2 3 4 5 6 7 Figure
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2 Divisions along arbitrary axis As
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9.BL2 half-length along x of the si
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1.DZ half-length along the z axis;
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ECAL BOX specifications 18/11/93 EC
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ECAL SPHE specifications 18/11/93 E
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Geant 3.16 GEANT User’s Guide GEO
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• if the CHONLY flag is set to MA
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y y x x y y y y z z x x z z y y x x
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Dynamic ordering The list of neighb
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GEOM Bibliography [1] French Standa
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Geant 3.16 GEANT User’s Guide HIT
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ITRA NUMBV HITS NHITS (INTEGER) is
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HITS Bibliography 175 HITS510 - 3
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0 if only IER] structures read in o
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NTRACK ITRA JKINE NTRACK JK 1 2 3 4
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Geant 3.16 GEANT User’s Guide PHY
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Below are listed the data record ke
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Computation of total crosssection o
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7. Update the number of interaction
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1= generation of secondaries enable
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DEEMAX The formula used by GEANT is
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GPHYSI Initialisation of physics pr
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• the mean number of tries is not
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as function of the variable u = Eθ
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GEANT 3.16 GEANT User’s Guide PHY
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2 Method If the energy of the radia
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Much of the difficulty in approxima
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SUBROUTINE GUSTEP +SEQ,GCKING,GCVOL
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CALL GRKUTA (CHARGE,STEP,VECT,VOUT*
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Clicking then on the right button o
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YMED R “ Center Y coordinate ”
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HIDE is ON, the detector can be exp
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following levels (red arrows) and o
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Draw a polyline of ’npoint’ poi
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a dynamical 3-D analysis of the sim
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1. position the cursor at (uz0,vz0)
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CHUSET C “User set identifier”
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Set current attribute. 4.8 SSETVA [
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CALL GDCOL(-abs(icol)) 4.12 LWID lw
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5 GEANT/GEOMETRY Geometry commands.
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Print matrixes’ specifications. 5
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8.5 CDIR [ chpath chopt ] CHPATH C
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9 GEANT/FZ ZEBRA/FZ commands 9.1 FZ
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Check the structure of one or more
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FACTL R “Scale factor for SL” D
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12.14 PAIR [ ipair ] IPAIR C “Fla
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PPCUTM R “Cut for e+e- pairs by m
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LSTAT_7 C “user word” LSTAT_8 C
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This common contains the threshold
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ITR3D track being scanned (used tog
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* PARAMETER (MAXJMP=30) COMMON/GCJU
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GYMAX GZMIN GZMAX GXXXX GYYYY GZZZZ
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C COMMON/GCVOL2/NLEVE2,NAMES2(15),N
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C ESHELL - Shells potentials in eV
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Geant 3.11 GEANT User’s Guide ZZZ
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GFKINE KINE001, KINE100, KINE199 GF
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GPSTAT GEOM700 GPTMED CONS001, CONS
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ZZZZ Bibliography [1] T.Sjöstrand
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CDRSGA, 297 CGMULO, 221 CHANGEWK, 3
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