Fermilab
                        31-Jan-2001

present: Mayda, Steve, Sally Dawson, Jane Nachtman, Maria, Adam,
Joanne, Tom, and Michael (minutes)

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Sally Dawson -- top section
                ===========
Some topics involving new physics will be moved to the "exotics"
session, and those involving Higgs will be moved to Higgs.
The WW, Exotics and Top section are already coordinating their
talks to avoid overlap and gain some complementarity.  Sally will
start looking for speakers.

Steve Mrenna -- SUSY
                ====
We went rapidly through the SUSY outline that Steve and Carlos
sent.  Here the e-gamma and even e-e- options might be very
interesting.  There is a lot of room for research in this area.
Steve/Carlos will begin looking for speakers.

Steve had been very busy with the workshop at Davis.  One of the
interesting results that came out at the workshop comes from Maria,
concerning the general 2HDM.  The sign of the coupling can change
relative to the SM, and be manifested in the interference of
amplitudes.  In particular, there could be an impact on the gamma-
gamma partial width.  Charged Higgs could play an interesting role
here.    We will certainly look forward to hearing all about this
in Maria's talk at our workshop!

Maria mentioned that there was also some interesting work
from the Japanese concerning H,A interference.

Jane Nachtman -- Monitoring and Detector Issues
                 ==============================
Jane has started to work on a list of priorities and topics which
she obtained from Mayda:
  Monitoring
     1. electron polarization, after scattering.  Amit Lath
     2. luminosity measurement: needs a 4lepton MC
     3. beam positioning
     4. photon energy spectrum.  Contact Ulrick Mikkelsen
  Detector Issues: useful input from Jeff Gronberg
     1. main issue is the increased radiation in the IR region
        wrt an e+e- collider
     2. triggering
     3. `new' backgrounds, such as hadronic interactions of photons.
        Jane and Maria Krawczyk will discuss this.
     4. Adam: the beampipe will be rather different
     5. Can we polarize the positron beam?

Mayda -- SLC
         ===
There was a serious bug in PANDORA, which Peskin fixed last week.
As a result, the cross section for single-W production is smaller
by a factor of a thousand.  This destroys any hope of doing W-width
measurement, etc., at SLC in e-gamma collider mode.

So the physics focus turns now to hadronic interactions of photons.
Maria is aware of several interesting topics, such as heavy flavor
and exclusive processes, which could be pursued if the energy
were substantially *reduced*.  Stan Brodsky might be very interested
in this option.

In light of this change of focus, the SLC option most likely will
become part of the QCD & Photon Structure session.

Michael -- Higgs
           =====
There is now a list of topics and names, and people have been contacted.
Stefan Soldner-Rembold is very interested, and we hope to get Muehlleitner,
too.  Several people recognized and emphasized that the study of the
heavier Higgs boson states could well be the exclusive domain of a
photon collider, as they can generically (in MSSM and in 2HDM) have
suppressed couplings to Z's and W's.  The study of all three neutral
Higgs bosons would be vitally important for unraveling CP violation
in the Higgs sector.  Sally or Laura Reina will come and talk about
the top Yukawa coupling.

Tom and Joanne -- WW and Exotics
                  ==============
Jikia and Gounaris are likely to give talks on anomalous couplings.
The production of W's, top and light quarks is likely to be merged
into one talk.  There will be a talk on large extra dimensions and
graviton resonances, which Tom will give.
 
 

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next meeting:
  Wednesday, Feb 7, at noon.