Agenda
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(1) Paul Hodgson         Untagged Events: LEP 2 data vs. PHOJET
(2) Olaf Krasel          Muon Tagged Charm
(3) Andreea Taune        Electron Tagged Charm
(4) Gerrit Prange        Double Tagged Events - a first look
(5) Mark Lehto           Jets in Single Tagged Events
(6) Alex Finch           Report from LEP-Wide Group
(7) Armin Boehrer        A first look at Lambda_c
(8) Ngac An Bang         Particle fractions in gamma gamma

(9 = AOB) Everyone       What will be submitted to conferences?
                         Especially: DIS2000 (May)
                         /PHOTON2000 (August)

                         Armin Boehrer + Alex Finch

 Minutes
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(1) Paul showed several plots which will form part of an Aleph note in 
    the near future. This is an update to an earlier note by A.Finch
    comparing PHOJET and Aleph untagged gamma gamma data. As before the
    overall comparison is very good, but detailed comparison in
    individual detectors show up problems which appear to be related to
    detector simulation problems. Particular problems are seen in LCAL
    and SiCAL. 

(2) Olaf showed an essentially final result of using muon tagging to
    measure the charm cross section. The final result is highly
    dependant on the choice of Monte Carlo program (PYTHIA or PHOJET) to
    estimate the charm and non-charm muon selection
    efficiencies. However by using a chi-squared test to choose the best
    combination of models (PYTHIA for charm, PHOJET for non charm) Olaf
    obtains a measurement of the cross section which is consistent with
    the recent result from L3. Both are on the high side compared to
    theory.

(3) Andreea presented for the first time her analysis using electron
    tagging to measure the charm cross section. She showed that details
    of such things as the number of VDET hits on a track and the
    longitudinal shower profile are not well modelled by the Monte
    Carlo. Putting that worry to one side for now she obtains a cross
    section following the same procedure as Olaf which is consistent
    with his result.

(4) Gerrit showed his analysis of events with two tagged electrons,
    using Sical and/or LCAL for the tagging. The data is compared to
    PHOJET and PHOT02, where the QPM u+d quark component only was
    simulated. Neither model provides a good description of the data. He
    has looked into using a kinematical fit to improve the energy
    resolution on the final state hadronic mass.

(5) Mark continues to work with Bjorn Poetter to develop JETvip into a
    useful program that can predict the jet cross sections in tagged
    events. It had been hoped that Bjoern would be able to attend but
    unfortunately this was not possible. We hope to arrange a meeting in
    the near future.

(6) Alex reported that the LEP-Wide group continues to consider a common
    problem in both the Total cross section and Structure function
    measurements, namely the choice of unfolding program. We have had
    talks from the authors of the major programs in use, and hope that
    Klaus or Glen will be able to give us a talk about Aleph's
    2-dimensional method soon. 

    He also reminded everyone that the author of PHOJET (Ralph Engel) 
    will be visiting Lancaster during February and repeated the hope
    that this would lead to a new improved PHOJET being released (!)

(7) Armin showed evidence of Lambda_c production in gamma gamma events
    in Aleph. No measurement of this has been published.

(8) Bang showed a study of using dE/dx to identify pi/K/p fractions in
    the data. He showed disturbingly large differences between the data
    and the simulations, and was encouraged to discuss these with other
    Aleph experts who may shed some light on them.

(9) AOB
    It was agreed that Olaf's work could be ready for a preliminary
    presentation at the Winter conferences. He is encouraged to write a
    Conference Note AS SOON AS POSSIBLE. A likely date for a Thursday
    meeting presentation is 10th March.

    Alex Finch