present:
Mayda Velasco
Jeff Gronberg
Sahal Jacoob
Stefan Soeldner-Rembolt
Heather Logan
David Asner
Steve Mrenna
Michel Schmitt

======================================================================
Mayda -- Status of gamma-Z and ZZ Channels
         ---------------------------------

Mayda presented the status of the h -> gamma-Z and ZZ channels.

She has working code from Thomas Hahn to calculate the cross
sections for the backgrounds (ie continuum) gamma-Z and ZZ
final states.  Steve and Sahal are working on the gamma+ffbar
and 4-fermion processes: they will be using the full matrix
element but no non-perturbative enhancements.  (Note that the
gamma-ffbar final state has been proposed for beam calibration
and monitoring.)

Consider h->ZZ.  The cross section times BR is about 1.5 fb, which
means there would be about 440 events in a CLICHE-year.  For the
gamma-Z final state, however, the yield would be only 16 events.
Fortunately, based on the cross sections from Hahn's program, the
ZZ and gamma-Z backgrounds are probably very small -- smaller
than 0.01 fb !!  This comes in part because they are sharply
peaked in the forward direction (especially gamma-Z).

Question: does PANDORA handle two off-shell bosons correctly?
(This is not trivial.)

A quick comparison of Sahal's and Steve's cross sections with
Carimalo et al., shows up major discrepancies.  Steve, working
with his laptop in the meeting, discovered that the muons mass
is hard-coded to be zero in their version of MADGRAPH.

In the future, Heather will combine the information from all
the gamma-gamma channels to obtain constraints on MSSM parameters.
The time scale for all this is 3-4 weeks...
======================================================================
Sahal -- LINX Studies of e-gamma scattering
         ==================================

Sahal took some code from Steve and started applying it to
the expected LINX situation.  He was studying how the
distributions for e-gamma scattering depend on the photon
and electron polarization.  He finds some significant changes
in shapes which potentially could be used to measure the
polarization.  This extends the work of Takahashi who was
looking into this earlier.

======================================================================
The next meeting is scheduled for June 7 (Friday).
This will be a video conference.