HERA MC workshop: Working Groups

DESY workshop on Monte Carlo Generators for HERA Physics

Working Groups

Last update: June 5, 1998 http://www.desy.de/~heramc/wg.html

WG 10: QCD cascades
Conveners: Leif Lönnblad (Lund), Nick Brook (Glasgow)

evolution equations for photon and proton:

DGLAP, CCFM, BFKL
factorisation schemes and scales (kt**2,Q2,...)
semi analytic solutions
angular ordering, pt ordering, coherence effects
treatment of heavy flavours
parametrisations of parton densities, kt unintegrated gluon densitiy
usage of parton densities for inclusive quantities, hadr. final states, heavy flavours, ....

implementation of QCD cascades in hadron level MC's:

color dipole (CDM - ARIADNE)
linked dipole chain (LDC)
forward - backward evolution of parton showers (PS)
initial state PS based on DGLAP evolution
final state PS
matching PS with matrix elements
reatment of heavy flavours
fixed pt cutoff or Sudakov suppression for matrix elements
kt ordering and factorisation of initial and final state PS (standard MC versus LDC)
implementation of NLO PS in MCs

WG 20: Fixed higher order programs for DIS and photoproduction
Conveners: Dirk Graudenz (Villingen), Marc Weber (Heidelberg), Jose Repond (Argonne)

validity of fixed order pQCD (negative weights)
NLO and hadronisation
NLO and QCD cascades (PS)

WG 30: Transition from photoproduction to DIS
Conveners: Jiri Chyla (Prague), Gerhard Schuler (CERN), Jon Butterworth (UC London)

generation of total cross section and all channels
hard pQCD processes
concept of resolved virtual gamma's
usage of virtual photon parton densities in MCs
relevance of photon photon data from LEP for HERA

WG 40: Non-perturbative QCD
Conveners: Gunnar Ingelman (Uppsala/DESY), Dave Milstead (DESY)

perturbative mechanism
soft underlying event
clusters and strings
soft colour interactions
photon and proton remnant properties

WG 50: Diffraction
Conveners: Jochen Bartels (Hamburg), Halina Abramowicz (Tel Aviv), Krzysztof Piotrzkowski (Cracow), Robert Roosen (Brussels)

models
evolution equations
higher twist
VM's from hadronization
proton dissociation
treatment of subleading Regge trajectories in MCs
soft color interactions
concept of fracture functions and MCs

WG 60: Heavy flavors
Conveners: Beate Naroska (Hamburg), Chang Kim (Ohio), Yorgos Tsipolitis (ETH Zuerich)

J/psi in NLO and colour octed processes
open charm/ open bottom production

WG 70: QED radiative effects
Conveners: Hubert Spiesberger (Bielefeld), Laurent Favart (Brussels), Stefan Schlenstedt (DESY Zeuthen)

DIS and photon proton interactions
QED Compton in NLOs
Lepton pair

WG 80: Exotics
Conveners: Emmanuelle Perez (Saclay), Masahiro Kuze (KEK)

W production
SUSY
Leptoquarks
Instantons
light Higgs

WG 90: Tools for comparing HERA data with MCs: HZTOOL and technical issues
Conveners: Tancredi Carli (MPI Munich), Nick Brook (Glasgow)

random number generators -- duty cycle
integration routines -- precision
modularity/transportability
standard interface for partons
tuning
single/double precision variables
weighting procedures for experiments
rewriting in c++
copyright issues

List of participants for startup meeting (ps file)

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