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CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide KINE200<br />

Origin : R.Brun,R.Hemingway Submitted: 01.11.83<br />

Revision : Revised: 15.12.93<br />

Documentation :<br />

Interface to the Lund Monte Carlo<br />

GEANT contains a simple interface to the JETSET Monte Carlo generator [1]. This interface is composed by<br />

an initialisation routine and an event generation routine.<br />

CALL GLUNDI<br />

This is the initialisation routine which should be called before the call to GFFGO,asitdefines the data record<br />

LUND. This routine performs the following actions:<br />

1. sets ECLUND= √ s =92.25 GeV;<br />

2. sets IFLUND= 0;<br />

3. activates initial state radiative effects MSTJ(107)= 1;<br />

4. declares some particles (K 0 s , Σ ± , Ξ ± , Λ 0 , Ω − ) to be stable in JETSET so that GEANT can handle their<br />

tracking and decays:<br />

MDCY(LUCOMP(310) ,1)=0<br />

MDCY(LUCOMP(3222),1)=0<br />

MDCY(LUCOMP(3112),1)=0<br />

MDCY(LUCOMP(3322),1)=0<br />

MDCY(LUCOMP(3312),1)=0<br />

MDCY(LUCOMP(3122),1)=0<br />

MDCY(LUCOMP(3334),1)=0<br />

Variables ECLUND, total energy in the CMS, and IFLUND, quark flavours produced, are used as arguments<br />

for LUEEVT called by GLUND and they can be changed via the LUND data record (see [BASE040]).<br />

CALL GLUND<br />

Generate a e − e + collision via the JETSET MonteCarlo and stores the resulting final state particles for transport<br />

by GEANT. All particles are attached to a vertex in (0.,0.,0.). The K and P arrays containing the full<br />

JETSET event are copied in the user buffer of the generated vertex, with the K variables converted into REAL<br />

numbers. The content of the user buffer is the following:<br />

UBUF(1) 527.0<br />

UBUF(2) N number of particles ⎫<br />

UBUF(3) K(1,1)<br />

UBUF(4) K(1,2)<br />

UBUF(5) K(1,3)<br />

UBUF(6) K(1,4)<br />

UBUF(7) K(1,5)<br />

⎪⎬<br />

UBUF(8) P(1,1)<br />

UBUF(9) P(1,2)<br />

UBUF(10) P(1,3)<br />

UBUF(11) P(1,4)<br />

UBUF(12) P(1,5)<br />

⎪⎭<br />

N times<br />

190 KINE200 – 1

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