 |
 |
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/ >> >> --------------------------------------------------------------------------------------------- >> ######################################################################## >> 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 > ---------------------------------------------------------- Heather E. Logan http://www.physics.carleton.ca/~logan Department of Physics, Carleton University, Ottawa, Canada ######################################################################## 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