problems with initialising Pythia

From: Robert Loke (loke@ifh.de)
Date: Fri Jan 22 1999 - 11:30:31 MET


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.);

(...)
}

=================================

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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