HERA MC WG40 `Non-perturbative QCD'

DESY workshop on Monte Carlo Generators for HERA Physics

Working group 40: Non-perturbative QCD

http://www.desy.de/~ingelman/wg40 last updated February 22, 1999

Conveners: Sergei Chekanov (Argonne), Gunnar Ingelman (DESY/Uppsala), Dave Milstead (DESY)
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Members: Alessandro Bertolin (Padova), Adi Bornheim (Bonn), Tancredi Carli (MPI Munich), Sergei Chekanov (Argonne), Jiri Chyla (Prague), James A. Crittenden (Bonn), Benoit Delcourt (Orsay), Tony Doyle (Glasgow), Anders Edin (Uppsala), Peter Fagerstroem (Toronto), Johannes Gerigk (MPI Munich), Günter Grindhammer (MPI Munich), Gösta Gustafson (Lund), Holger Ihssen (DESY), Gunnar Ingelman (DESY/Uppsala), Hannes Jung (Lund), Bernd Kniehl (MPI Munich), Alexander Kupco (Prague), Leif Lonnblad (Lund), Dave Milstead (DESY), Jan Okrasinski (Pennsylvania), Frederique Pelucchi (DESY), Johan Rathsman (Uppsala), Andreas Ringwald (DESY), Fridger Schrempp (DESY), Mike Seymour (RAL), Michael Sievers (???), S??? Todorova-Nova (Strassbourg), Daniel Traynor (QMW), Markus Wobisch Aachen()

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Agenda/presentations at meetings: see workshop home page

Aim: To investigate various aspects of non-perturbative QCD in Monte Carlo event generators. This concerns hadronization, proton and photon remnants, possible underlying event, models for soft interactions, QCD instantons etc. There are both fundamental questions (what is the correct/best description of the physics?) and practical ones (does the models/implementations work in comparison to data?).

The start-up meeting in April 1998 identified the following relevant topics:

Strings vs Clusters - Are there any variables to pick out strengths and weaknesses of these two approaches ?
Strangeness, baryon production - how much faith should we have in JETSET/HERWIG in predicting the finer aspects of hadronization ?
Fragmentation of charm - What is the best approach to deriving universal fragmentation functions ?
Treatment of fragmenting proton and photon remnant systems - What influence do the different MC prescriptions have on everyday observables ?
Soft Underlying Events - Is there a consistent approach to using SUE in experiments and MC's ?
Soft Colour Interactions -SCI vs Regge approach, how can we see differences?
The Modelling of QCD instantons at HERA - Can we develop reliable search strategies based on hadronic final state signatures ?
Future Measurements - Now that H1 and ZEUS are becoming high statistics experiments, what further detailed measurements can be made to test the various approaches.