Hi Tom and Michael,

I think in Chip's slides he described these searches as "loophole-free". 
How about a working like,

"Experiments at lepton colliders allow for clear discovery or unequivocal 
exclusion of new particles in searches that complement those at the LHC." 
?

-Heather

On Sat, 17 Aug 2013, Tom LeCompte wrote:

> Hi Michael,
>
> I am not sure Line 119 says what we want it to say: " Experiments at lepton 
> colliders allow unambiguous searches for new particles...".  I don't think 
> you mean the searches themselves are unambiguous (and by extension, that the 
> searches at the LHC are ambiguous).  Maybe you mean that the 
> *interpretations* are unambiguous (or at least clearer) than at hadron 
> colliders.
>
> See you Thursday,
>
> Tom
>
>
> On 8/17/2013 5:35 PM, Peskin, Michael E. wrote:
>> Dear Colleagues,
>> 
>> Chip and I have been presenting at the DPF meeting and trying to catch up 
>> on our sleep.
>> However, the work for Snowmass is not yet done.  We have some important 
>> questions
>> for you.
>> 
>> I attach a draft of the highest-level Executive Summary of Snowmass.   This 
>> is in a very
>> preliminary state; please do not circulate it further.   Chip and I ask in 
>> particular whether
>> you are in agreement with the 3-paragraphs that relate specifically to 
>> Energy Frontier.
>> I attach these at the end of this note.    This document is under revision 
>> now, so please
>> send your reactions as soon as possible.
>> 
>> The executive summary will be the first part of a 30-page Snowmass summary 
>> document.
>> That will include a 4-5 page summary of the results of the Energy Frontier 
>> study.  Chip and I
>> are working on our final revisions of a first draft.  We will circulate 
>> that to this list tomorrow.
>> 
>> The 30-page summary of Energy Frontier is not yet ready to be circulated. 
>> We are sorry for the
>> delay.  However, this document will follow closely the long version of 
>> Chip's talk given on Sunday
>> at Snowmass.  We just need to put this into prose.
>> 
>> We would like to return to our scheduled phone meeting of the EF conveners 
>> this week and
>> next week.  I remind you that time is 11am PDT/ 2pm EDT Thursday, and that 
>> the coordinates are:
>> 
>> August 22: 11:00 PDT / 2:00 EDT
>>      Contact information:
>>
>>   You call:    domestic...     (877) 873-8018
>>                 international...    (636) 651-3182
>>
>>    participant code: 290-043
>> 
>> We will start the meeting promptly and end promptly after 1 hour.
>> 
>> The agenda for this week is discussion of the two summary documents.
>> 
>> I hope that your working group reports are headed toward completion by the 
>> end of the month.
>> I promised written comments on the drafts, but -- please excuse me -- I did 
>> not send these yet.
>> Please expect them early this week.
>> 
>> Chip and I would like to thank you again for all of the work that you have 
>> put in thus far. Chip
>> received much positive feedback on his talk at Snowmass, but, of course, 
>> the supporting work
>> is yours.  We are grateful.
>> 
>> Best wishes,
>> 
>> Michael
>>
>> 
>> --------------------------------------------------------------------------------------
>> 
>> 
>> EF paragraphs in the Snowmass executive summary
>> (In the full document, you will see that this is followed by paragraphs 
>> from the accelerator side)
>> 
>> 
>> The mysteries of the newly discovered Higgs boson were a major theme at 
>> Snowmass.  Much attention was given to the importance of studying the Higgs 
>> boson as closely as possible.  At high energy accelerators, the “Energy 
>> Frontier,” there are three approaches:  first, to search for new particles 
>> with TeV masses predicted by models of electroweak symmetry breaking, 
>> second, to make precise measurements of the heavy particles $W$, $Z$, and 
>> the top quark, which can carry the imprint of the Higgs, and, third, to 
>> measure the properties of the Higgs boson itself to very high precision. 
>> This program is closely connected to the search for the dark matter 
>> particle and for flavor-changing rare decays; in both cases, the motivating 
>> theory is often associated with the Higgs and its symmetry-breaking.
>> 
>> For at least the next fifteen years, the experiments at the Large Hadron 
>> Collider at CERN will drive this program forward.  Especially in its 
>> high-luminosity phase, the LHC is expected to explore deeply for new 
>> particles produced through either the strong or the electroweak 
>> interactions.  They LHC will study rare decays using a sample of billions 
>> of top quarks, probe for new dynamics of W, Z, and Higgs at TeV energies. 
>> It will measure Higgs boson couplings at the few-percent level and provide 
>> the first measurement of the Higgs self-coupling.  The LHC experiments have 
>> already proved their ability to work as global collaborations.  Technology, 
>> insights, and leadership from the US have played important roles in these 
>> experiments.
>> 
>> There is strong scientific motivation for continuing this program with 
>> lepton colliders. Experiments at lepton colliders allow unambiguous 
>> searches for new particles that complement those at the LHC. They can 
>> improve our precision knowledge of W, Z, and top by an order of magnitude, 
>> potentially bringing these measurements into confrontation with theory. 
>> They can reach sub-percent precision in the Higgs boson properties, 
>> allowing discoveries of percent-level deviations predicted in theoretical 
>> models. A global effort has now completed the technical design of the 
>> International Linear Collider (ILC), an accelerator that will give these 
>> capabilities.  The Japanese high energy physics community has named this 
>> facility as its first priority.
>> 
>>
>> 
>> -------------------------------------------------------------------------------------------
>>    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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----------------------------------------------------------
Heather E. Logan     http://www.physics.carleton.ca/~logan
Department of Physics, Carleton University, Ottawa, Canada

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