Folks:
Here are the agenda and phone meeting coordinates for our meeting this Thursday.
Please note under item #2 that each working group should circulate 1 slide in
advance.
Thanks,
Michael and Chip
========================================================
We will have our weekly EF Convener's phone call on Thursday, June 6.
Energy Frontier Conveners' meeting
June 6: 11:00 PDT / 2:00 EDT
Contact information:
You call: domestic... (877) 287-0283
international...(303) 433-0165
participant code: 290-043
We will start the meeting promptly and end promptly after 1 hour.
Agenda
0. The Education and Outreach group will organize a Physics Slam in Minnesota. Any
volunteers? Please suggest younger members of your group who would be great at this.
1. Seattle meeting: How many from your group will attend? How much more
publicity is needed?
2. Your working group's status by Seattle:
-> Please make 1 slide reporting
a. What work can you reliably predict will be reported at Seattle?
b. What work will not be completed by Seattle but will be completed before
Minnesota?
and email it to the snowmass-ef mailing list. We will go over the lists on
Thursday and then update them each week.
Chip and Michael anticipate that there is much work that will not come in until
after Seattle. This is especially true for work that will be done within
ATLAS and CMS for their white papers. We will need to provide frameworks
for our reports and then hang the new information at the appropriate place
on the framework when it is available.
3. Begin discussion of our conclusions for Seattle. In our opinion, the most
uncertain aspect of what we will present is the physics case for the HL-LHC,
ie. LHC from 300 fb-1 to 3000 fb-1. We list some elements of this case below.
Chip and Michael would like to discuss: (a) what items should be added to this list
(b) to what extent will you be prepared to discuss these items in detail at Seattle?
We will discuss other aspects of our "4 questions" in subsequent weeks.
Thank you,
Chip and Michael
=============================================================
Elements of the case for 3000 fb-1:
This is just a first draft; thanks to Ashutosh for correpondence
1. Higgs:
Higgs mass from gamma gamma and ZZ*
general expectations for Higgs branching ratios
Very accurate, low systematics measurements, e.g.
Gamma(gamma gamma)/Gamma(ZZ*)
Rare SM branching fractions (mu mu, Z gamma)
Exotic branching fractions (invisible, e mu, mu tau, … )
2. W, Z physics:
Light Higgs "resolves" the unitarity problem, but still there
can be W,Z resonances in the TeV region. These are searched for
in vector boson scattering and studies of 3-vector couplings
3. Precision measurement:
Are there special strategies for mW, mt, alphas that can take advantage of
very high statistics by selecting special classes of events?
Improvement in parton distributions, especially in gluon and antiquark
distributions
4. New particle searches:
The ancient wisdom is: a factor of 10 in luminosity gives a factor of 2
in energy . But this fails to be true when the current limits are
already accessing the tails of parton distributions.
Certain searches can take full advantage of the improvement in
luminosity:
electroweakino searches in SUSY
searches for Drell-Yan resonances
searches for t tbar resonances, and for di-top or 4-top final states
searches involving long-lived lepton partners
heavy Higgs decay to Higgs(125), with one Higgs tagged in gamma gamma
We should make a general picture of LHC searches that highlights these
opportunities.
Some people would argue that no discovery at LHC with 3000 fb-1 excludes
"naturalness". Do we have an attitude toward this question?
5. Followup to discovery:
The opportunity for new particle discovery at LHC 300 fb-1 is high. What
measurements will then be needed?
rare leptonic and multilepton decay paths
tests of flavor-degenerate spectrum or flavor-changing decays
what is the full mass spectrum of the decay products of new particles?
=============================================================================
-------------------------------------------------------------------------------------------
Michael E. Peskin [log in to unmask]
HEP Theory Group, MS 81 -------
SLAC National Accelerator Lab. phone: 1-(650)-926-3250
2575 Sand Hill Road fax: 1-(650)-926-2525
Menlo Park, CA 94025 USA www.slac.stanford.edu/~mpeskin/
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