Robert Loke wrote: > > Hi Rooters, > > I've got a problem in intializing Pythia: > > ======== source code =========== > TROOT PythRoot("PythRoot","running pythia"); > > int main(){ > > //inits > int NofEvents = 100; > TPythia pythia; > TObjArray* particlelist; > > TFile ofile("pythia.root","RECREATE"); > > pythia.SetMSEL(1); > pythia.SetPMAS(6,1,175.0); > > pythia.Initialize("FIXT","p","p",820.); > > (...) > } > Hi Robert, When I run your example with the standard Root and the following interactive session dynamically linking with the Pythia libraries, I obtain a correct result, see below. I use an old version of Pythia (5.7) because I was told that there are problems with version 6. Rene Brun root [0] gSystem.Load("libEG") (int)0 root [1] gSystem.Load("$PYTHIA/libPythia") (int)0 root [2] gSystem.Load("libEGPythia") (int)0 root [3] TPythia pythia; root [4] pythia.SetMSEL(1); root [5] pythia.SetPMAS(6,1,175.0); root [6] pythia.Initialize("FIXT","p","p",820.); 1 ****************************************************************************** ****************************************************************************** ** ** ** ** ** PPP Y Y TTTTT H H III A JJJJ EEEE TTTTT SSS EEEE TTTTT ** ** P P Y Y T H H I A A J E T S E T ** ** PPP Y T HHHHH I AAAAA J EEE T SSS EEE T ** ** P Y T H H I A A J J E T S E T ** ** P Y T H H III A A JJ EEEE T SSS EEEE T ** ** ** ** ** ** *......* Welcome to the Lund Monte Carlo! ** ** *:::!!:::::::::::* ** ** *::::::!!::::::::::::::* This is PYTHIA version 5.707 ** ** *::::::::!!::::::::::::::::* Last date of change: 20 Oct 1994 ** ** *:::::::::!!:::::::::::::::::* ** ** *:::::::::!!:::::::::::::::::* This is JETSET version 7.401 ** ** *::::::::!!::::::::::::::::*! Last date of change: 11 Feb 1994 ** ** *::::::!!::::::::::::::* !! ** ** !! *:::!!:::::::::::* !! ** ** !! !* -><- * !! Main author: ** ** !! !! !! Torbjorn Sjostrand ** ** !! !! !! Theory Division, CERN, ** ** !! !! CH-1211 Geneva 23, ** ** !! ep !! Switzerland ** ** !! !! phone +41 - 22 - 767 28 20 ** ** !! pp !! E-mail TORSJO@CERNVM.CERN.CH ** ** !! e+e- !! ** ** !! !! Copyright Torbjorn Sjostrand ** ** !! and CERN, Geneva 1993 ** ** ** ** ** ** When you cite these programs, priority should always be given to the ** ** latest published description. ** ** Currently this is, for JETSET ** ** T. Sjostrand and M. Bengtsson, Computer Physics Commun. 43 (1987) 367, ** ** and for PYTHIA ** ** H.-U. Bengtsson and T. Sjostrand, Computer Physics Commun. 46 (1987) 43. ** ** The most recent long description (unpublished) is: ** ** T. Sjostrand, CERN-TH.7112/93 (1993). ** ** Also remember that the programs, to a large extent, represent original ** ** physics research. Other publications of special relevance to your ** ** studies may therefore deserve separate mention. ** ** ** ** ** ****************************************************************************** ****************************************************************************** Warning: JETSET subversion too old for PYTHIA 1****************** PYINIT: initialization of PYTHIA routines ***************** ============================================================================== I I I PYTHIA will be initialized for p on p fixed target I I at 820.000 GeV/c lab-momentum I I I I corresponding to 39.250 GeV center-of-mass energy I I I ============================================================================== ******** PYMAXI: summary of differential cross-section maximum search ******** ========================================================== I I I I ISUB Subprocess name I Maximum value I I I I ========================================================== I I I I 95 Low-pT scattering I 2.4146E+01 I I 96 Semihard QCD 2 -> 2 I 2.7197E+01 I I I I ========================================================== ********************** PYINIT: initialization completed ********************** > ================================= > > The ouput produced is: > > ****************************************************************************** > ****************************************************************************** > ** ** > ** ** > ** *......* Welcome to the Lund Monte Carlo! ** > ** *:::!!:::::::::::* ** > ** *::::::!!::::::::::::::* PPP Y Y TTTTT H H III A ** > ** *::::::::!!::::::::::::::::* P P Y Y T H H I A A ** > ** *:::::::::!!:::::::::::::::::* PPP Y T HHHHH I AAAAA ** > ** *:::::::::!!:::::::::::::::::* P Y T H H I A A ** > ** *::::::::!!::::::::::::::::*! P Y T H H III A A ** > ** *::::::!!::::::::::::::* !! ** > ** !! *:::!!:::::::::::* !! This is PYTHIA version 6.115 ** > ** !! !* -><- * !! Last date of change: 27 Jan 1998 ** > ** !! !! !! ** > ** !! !! !! ** > ** !! !! ** > ** !! ep !! Disclaimer: this program comes ** > ** !! !! without any guarantees. Beware ** > ** !! pp !! of errors and use common sense ** > ** !! e+e- !! when interpreting results. ** > ** !! !! ** > ** !! Copyright T. Sjostrand (1997) ** > ** ** > ** An archive of program versions and documentation is found on the web: ** > ** http://www.thep.lu.se/tf2/staff/torbjorn/Pythia.html ** > ** ** > ** When you cite this program, currently the official reference is ** > ** T. Sjostrand, Computer Physics Commun. 82 (1994) 74. ** > ** The supersymmetry extensions are described in ** > ** S. Mrenna, Computer Physics Commun. 101 (1997) 232 ** > ** Also remember that the program, to a large extent, represents original ** > ** physics research. Other publications of special relevance to your ** > ** studies may therefore deserve separate mention. ** > ** ** > ** Main author: Torbjorn Sjostrand; Department of Theoretical Physics 2, ** > ** Lund University, Solvegatan 14A, S-223 62 Lund, Sweden; ** > ** phone: + 46 - 46 - 222 48 16; e-mail: torbjorn@thep.lu.se ** > ** SUSY author: Stephen Mrenna, Argonne National Laboratory, ** > ** 9700 South Cass Avenue, Argonne, IL 60439, USA; ** > ** phone: + 1 - 630 - 252 - 7615; e-mail: mrenna@hep.anl.gov ** > ** ** > ** ** > ****************************************************************************** > ****************************************************************************** > 1****************** PYINIT: initialization of PYTHIA routines ***************** > > ============================================================================== > I I > I PYTHIA will be initialized for p on p fixed target I > I at -1.997 GeV/c lab-momentum I > I I > I corresponding to 2.429 GeV center-of-mass energy I > I I > ============================================================================== > Error: too low CM energy, 2.429 GeV for event generation. > Execution stopped! > ------------------------------------------------------------------------------- > ------------------------------------------------------------------------------- > > I compared with the AtlFast-docu on the root-HP, but didn't find the > difference up to the initialize-call... > > So: what's going wrong? > > I'm running root, version 2.20/06 on LINUX. > > Any help is welcome... > > Thanks, Robert > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > + Robert Loke + > + Humboldt University Berlin + > + Invalidenstr. 110 + > + 10115 Berlin + > + Germany + > + + > + e-mail : loke@ifh.de + > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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