present:
Mayda Velasco
Jeff Gronberg
Sahal Jacoob
Stefan Soeldner-Rembolt
Heather Logan
David Asner
Michel Schmitt
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Mayda -- The Overall Plan
===============
Mayda presented suggestions for how to get the most relevant
work done in time for the LC conference in Korea. There was
much discussion and many suggestions (which I will not try to
reproduce here). A rough consensus can be summarized as follows:
h->bbbar NLO treatment is finished: are
there any important
issues for the light Higgs? We need to establish better
the visibility of the heavier Higgs states in the MSSM,
and back up our claims that linear polarization can be
used to identify the states.
h->WW This channel still
is in progress: QCD backgrounds
remain to be estimated, and these require four-fermion
generators.
h->gaga done. A paper is in the draft stage.
h->leptons Mayda looked into this: muons and taus
are both
impossible.
h->gaZ,ZZ Mayda's estimates say these channels
are promising.
She is waiting for the 4-fermion generator to make
progress. Sahal will work with Steve to get it done.
The gaZ channel, when combined with the gaga channel,
is expected to help tie down the stop sector, especially
if there are CP violations. It might be possible to
extract the total width from h->ZZ by combining with
measurements from an e+e- collider.
gaga->H+H- This looks promising, but no real work
has been done
yet. This is a priority item.
gaga->csH- This may be quite hard, due to the low
cross section.
It could be investigated as part of the H+H- study.
charginos People were pessimistic that a gaga
collider would
be able to compete with e+e-. However, it was pointed
out that the gaga cross section depends only on the
electric charge, and hence is independent of the field
content of the charginos. This may prove useful when
combined with e+e- measurements.
Other points that came up in the discussion:
1- We should send an abstract for ICHEP in Amsterdam.
(Deadline: May 15)
2- Tom Rizzo is very interested in studying possible signals for
extra dimensions at a gamma-gamma collider.
3- Similarly, Joanne Hewitt is interested in investigating signals
for radions (size moduli of extra dimensions).
4- David reports that a design for a 2 or 3 micron laser exists.
5- It was agreed that we should start drafting a contributed document
for Korea, irrespective of whether any of us gives a presentation.
One possibility would be a `draft run plan' which outlines
specifically which physics one would do with, e.g. CLICHE.
The important point is to draft the paper soon, even if
many
details only show up toward the end of the summer.
Upcoming conferences and workshops:
Santa Cruz (Jeff) 27-29 June
ICHEP - Amsterdam 24-31 July
ECFA - Tokyo July
S.Korea (Mayda) late August