Pythia6

General Chat
1

Dear rooters,

let me ask you two question on PYTHIA6 events generation:

  1. I have problems with running of p(beam)+p (fixed target) interaction with low beam momenta:
    ====================================
    I PYTHIA will be initialized for p on p fixed target
    I at 10.629 GeV/c lab-momentum
    I corresponding to 4.667 GeV center-of-mass energy
    =====================================
    Error: too low CM energy, 4.667 GeV for event generation.

I use root 4.03/02 and pythia6.319.

I read on root posts dated by 1999 (or 2000) that pythia6 has some bugs while version 5 does not… Is it still the case?

  1. Second thing is that current root make EGPythia6 interface assuming
    pythia6_common_block_address_
    while in the example which builds the library libPythia6.so this common block is called:
    pythia6_common_address

this make not possible to use Pythia6 (however the fix is obvious :slight_smile:. This is just FYI).

Any help on question 1) will be appreciated. Thanks, Dmitry

2

Hi,

I’ve tried it with Pythia5 and Pythia6, with a simple Fortran program to initialize the event generator – therefore, no Root involved.

There seems to be a cut-off CMS energy of 10GeV. This has nothing to do with Root.

Perhaps you might want to use other Monte Carlo programs for your work. I don’t know the workings of Pythia but I guess it is designed for using high (relativistic) collisions, and 5GeV for protons might be in the frontier.

3

Thank you for your answer,
sorry for some delay in my reply - I was out of city.

Dmitry