I suggest that muon collider be included on the list of options being 
studied.

Ron


On 6/27/13 1:39 PM, Peskin, Michael E. wrote:
> New Particles, Forces, and Dimensions
>
> 0) Direct exploration at the energy frontier has historically been one of the most fruitful path to discovery of new fundamental physical phenomena, and remains strongly motivated today. Furthermore, the unique strength of the energy frontier is the ability to go beyond discover and experimentally establish new laws of nature. The recent discovery of the Higgs is an example of this.
>
> 1) With the discovery of the Higgs, particle physics is entering a new era: we now have a complete theory that can be consistently extrapolated to scales beyond which we can directly probe experimentally. However, there are many important questions and big ideas that motivate new physics beyond the standard model that can be probed in the energy frontier.
>
> Questions:
>
> What is the dark matter?
> Are fundamental parameters finely tuned?
> Are there new fundamental forces in nature?
> What is the origin of quark, lepton, and neutrino masses and mixing?
> Are "elementary" particles really composite?
>
> Big Ideas:
>
> Supersymmetry
> Extra dimensions
> Unification of forces
> Multiverse
>
> All of these can be probed to various degrees by experiments at the energy frontier.
>
> 2) We will address the reach of the high luminosity LHC in experimentally addressing these fundamental questions and ideas. The results of preliminary studies suggest that it will allow us to more thoroughly explore the TeV scale, especially for signals that are hidden by large standard model backgrounds or systematics that can be addressed with additional data. In addition, the case for future colliders will be strongly impacted by the results of this experiment. We will make an assessment about the importance of this experiment for continued progress in the energy frontier.
>
> 3) Further progress in understanding the fundamental interactions of nature will almost certainly require future energy frontier facilities. Options that have been studied are ILC, high-energy electron machine (e.g. CLIC), and high-energy hadron machines (e.g. VLHC). The possibility of new physics discovery at these machines is well motivated by the current experimental and theoretical situation. Discovery or non-discovery of new physics at the high-luminosity LHC and dark matter searches can inform the motivation for these future facilities in various ways. The main report will discuss a number of examples of this type.
>
> We will send a list of these examples later in the week. I will be presenting for our group in the Sunday plenary session at Seattle. Feedback is of course welcome.
>
> Markus Luty
>
>
> -------------------------------------------------------------------------------------------
>    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

########################################################################
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