Dear Colleagues,
We will have our weekly EF Convener's phone call tomorrow, Thursday, May 9.
Energy Frontier Conveners' meeting
May 9: 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 items:
1. Discuss the new block layout draft for the Seattle meeting (attached). Are any further changes needed?
2. We would like to finalize the list of questions from EF to the other Frontiers. This assignment is really overdue.
Please find the current list below -- we have added a number of items. But you can add more, especially relevant
to Instrumentation and Computing.
3. Uli Heinz sent us a list of questions from the Instrumentation Frontier. We would like to begin a discussion of
these. Here are the most important questions. Uli also wanted quantitative discussion of performance vs.
benchmark goals. But, for the moment, we will stay at the qualitative level. If you have nontrivial answers
to any of these questions, please contribute:
Can you identify benchmark physics goals that push the technology of current detectors?
What is the performance that you are assuming for simulations? Which aspects of detector performance
are most problemmatical to reach these goals?
What improvements in the detector would be transformational for the physics reach?
How important is fast time stamping of the signals from the detector? For which detector parts would this
be most important?
How important is the forward region?
How important is high b-tagging efficiency at low pT/at high pT?
What are the requirements for triggers? In particular: how important are tau triggers, missing ET triggers
and missing ET resolution? How important are inclusive lepton trigger thresholds ?
=======================================================================
Pump-priming questions to other frontiers
EF-IF: Describe the increase in sensitivity to new particles in loops as a function of time for the g-2, mu-e conversion, tau -> ell gamma, and EDM experiments. There should be separate estimates for SUSY models, in which the flavor-changing effects come from loops, and from models in which the flavor-change comes from a tree-level effective operator. This will facilitate plotting this evolution along with the evolution in sensitivity predicted for direct searches for new particles at the LHC?
EF-IF: Improvements in the muon g-2 meausurement need to be accompanied with improvements in the Standard Model prediction for the term involving the hadronic vacuum polarization. What are the prospects for improvement of the current estimate? To reach the parts per billion level in the error, the contribution from light-by-light scattering must also be improved with input from low-energy data. How can this be done?
EF-IF: The best current limits on the electron EDM come from experiments using polar molecules such as YbF in which atomic physics effects enhance the influence of an electron EDM. How can we check or calibrate the atomic physics calculations that go into the interpretation of these experiments?
EF-IF: With a grand unification scale at 10^{16} GeV as predicted by SUSY-GUTs, the lifetime of the proton to K nu is naively expected to be below 10^33 yr. What are we testing as we push the limits to 10^35 yr ? What are the crucial parameters of GUTs that allow the proton lifetime to be longer? Is the sensitivity to these parameters quartic, as for m_GUT, or only quadratic ? Is the expectation for the proton lifetime increased if superpartner masses are heavier than expected, and what is the relation between these quantities?
EF-IF: Imagine that one measures the CP violating phase in the neutrino sector to be 85 degrees (for example). What does this imply for the matter-anti-matter asymmetry due to
leptogenesis. What is the next measurement that one should make to clarify this relation?
EF-InstF: High luminosity running at a hadron collider will depend on efficient triggering in a difficult environment. Isolation requirements will likely be compromised, and, as a result, triggering on leptons may need to depend heavily on tracking. What are the most promising enabling technologies for electron/photon/tau triggers in an environment, considering luminosities up to 10^{35} cm^{-2}s^{-1}? What are likely R&D paths to realizing these technologies?
EF-Computing: To what extent is high-energy physics still generating the world's largest randomly-accessed databases? Can we claim to be a world leader in data science? Along what dimensions?
EF-CF: If dark matter has no SM interactions stronger than gravitational, are there any prospects for discovering its particle nature?
EF-CF: If dark matter is detected through non-collider experiments, what can we learn about its properties? (e.g., can we learn its spin?) Would we be able to learn whether it interacts with SM matter only through the "Higgs portal"?
EF-CF: Suppose there is a 10 GeV WIMP or 100 GeV WIMP with direct detection just below current limits. This is the best case for understanding the particle nature of the dark matter. What is the full set of measurements that we are likely to make on such a particle from Cosmic Frontier probes alone?
EF-CF: If there is more than one type of dark matter particle, how can we discover this in Cosmic Frontier experiments? Can we measure the dark matter fraction from different sources?
EF-CF: In indirect detection of dark matter, it is notoriously difficult to rule out all hypotheses that a signal is of astrophysical origin. But perhaps other knowledge from particle physics can help. Would it be helpful, for example, to know the mass of a dark matter candidate? What accuracy is needed? Can direct detection provide sufficient accuracy in the dark matter particle mass?
-------------------------------------------------------------------------------------------
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/
---------------------------------------------------------------------------------------------
########################################################################
Use REPLY-ALL to reply to list
To unsubscribe from the SNOWMASS-EF list, click the following link:
https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=SNOWMASS-EF&A=1
|
