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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