Topics addressed and meeting deadlines

• Hard diffraction models: Implementation and comparison
  • RAPGAP : q.qbar-pomeron model - implemented and available (H.Jung,..)
  • RIDI : q.qbar.g-pomeron model - implemented, not yet available (A.Solano)
  • RAPGAP : q.qbar.g-pomeron model - in process of implementation (H.Jung,J.Bartels,M.Wuesthoff)

• Diffractive light/heavy vector meson (photon) production at large t
  • J/psi modeling at large t exists (HITVM - P.Thompson, RHODI - N.N.)
  • Light vector meson/photon production (N.N.)

• Leading baryon production in DIS : Tuning LEPTO/ARIADNE Monte Carlo's to forward proton and neutron data (...,G.Ingelman)

• Modeling of proton dissociation : comparison of proton dissociation models
  • DIFFVM,EPSOFT (A.Matroberardino, K.Klimek)
  • HITVM,PHYTIA,PHOJET (N.N.)

• HzTool : To facilitate the confrontatation of models with data an atempt will me made to implement most of the diffractive published data in HzTool. This list can be found in summary talk of the october meeting

• Radiative correction to VM diffractive production : (see WG70)

• Goals for December meeting:
  • Finalise second item + interface to HzTool (A.Solano)
  • Finalise third item + interface to HzTool (H.Jung)
  • interface DIFFVM/EPSOFT to HzTool (A.Matroberardino, K.Klimek)
  • Complete as much as possible HzTool implementation (see table)
  • When forward (p,n) data available in HzTool First make tuning of LEPTO/ARIADNE (.?.)

• Goals for Final meeting : Results of Model comparisons

Dates and agenda for fortcoming meetings

Monday February 1, 9:30-12:30 and 15:00-18:00, Grosser Gästespeiseraum (guest dining room)

	Morning session: 9:30 - 12:30
	Ada Solano (Torino): RIDI MC Status
	Hannes Jung (Lund): Hard pomeron in RAPGAP
	Jenny Williams: Rapgaps and extraction of diffractive pdf
	Riko Wichmann (UCSC): Event shapes in RAPGAP and RIDI
	Afternoon session: 15:00 - 18:00
	Gunnar Ingelman (DESY/Uppsala): Rapidity gaps through string reconnections
	Anders Edin (Uppsala): Pompyt MC news
	Thomas Teubner (DESY): Upsilon photoproduction at HERA in pQCD
	Leszek Adamczyk (Cracow): Proton dissociation in DIFFVM and EPSOFT

Records of past meetings

Fith meeting, 7/12/98, DESY

• Ada Solano (Torino): RIDI MC - Status report
• Mark Wüsthoff (Durham): An overview on diffractive deep inelastic scattering
• Thomas Gehrmann (DESY): Inclusive and Diffractive Scattering in the Semiclassical Approach

Forth meeting, 5/10/98, DESY

• Jochen Bartels (Hamburg): The diffractive qqg final state: results
• Mark Wüsthoff (Durham): Large t gamma q-scattering
• Anna Mastroberardino (Cosenza): The proton fragmentation: DIFFVM
• Thomas Nunnemann (MPIH): Leading baryons and standard Monte Carlos
• Riko Wichmann (UCSC): Event shapes with the LPS

Third meeting, 1/9/98, DESY

• N. Nikolaev (Juelich, Landau Inst.): Intrinsic k_t in diffraction
• E. Levin (Tel Aviv): Survival probabilities of Large rapidity Gap events
• Hannes Jung (Lund): Selected points to be solved

Second meeting, 9/6/98, DESY

• Dmitri Ivanov (Leipzig): Hard diffractive light vector meson production at large |t|
• Johan Rathsman (Uppsala): Soft colour interactions and diffraction

First meeting 29/4/98, DESY

• Lee West (Birmingham) - HITVM Generator.
• Ada Solano (Torino) - RIDI Generator (*).
• Hannes Jung (Lund) - Remarks on RAPGAP.

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