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Dear All, With respect to the first paragraph, I think that it is our first priority and scientific responsibility is to fully investigate/measure the Higgs - so I would make this the first item on the list and not the third. Best, Andy On 8/23/2013 11:40 AM, Raymond Brock wrote: > hi > I have made a 1-word --> 2-word change to what I sent out earlier. > Thanks to Ashutosh. > > In memory of the big 10 football season that's over here at MSU before > it starts, I've put that single change in green. No team needs 4 > quarterbacks a week before the first game. > > I propose we work from this version. > > > > /Energy Frontier. The mysteries of the newly discovered Higgs boson > were a major theme at Snowmass. The properties of the Higgs boson > raise crucial questions that guide large parts of the future particle > physics program. These questions call for a three-pronged research > program at high energy accelerators: 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. Questions about the Higgs boson also inspire the > search for the dark matter particles and for flavor-changing rare > decays, since in both cases, the motivating theory often comes from > models of the Higgs and its role in symmetry-breaking. > > For at least the next fifteen years, the experiments at the Large > Hadron Collider at CERN will drive the energy frontier 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. The LHC will study rare decays using > a sample of billions of top quarks and 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 > proven their ability to work as global collaborations. Technology, > insights, and leadership from the US have played indispensible roles > in these experiments. > > There is strong scientific motivation for continuing this program with > lepton colliders. Experiments at lepton colliders allow searches for > new particles with unequivocal discovery or exclusion, complementing > those at the LHC. They can improve the precision of our knowledge of > the $W$, $Z$, and top properties by an order of magnitude, potentially > bringing these measurements into confrontation with theory. They can > reach sub-percent precision in the Higgs boson properties in a unique, > model-independent way, 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 provide these capabilities. The > Japanese high energy physics community has named this facility as its > first priority. > > The Snowmass study considered many other options for high-energy > colliders that might be realized over a longer term. These included > linear and circular e+e- colliders, muon colliders, and photon > colliders. Alonger termoption with great promise is a 100 TeV hadron > collider, which has unprecedented potential reach for new physics > associated with electroweak symmetry breaking, naturalness, and dark > matter. Further investigations of the physics and technical issues > would be opportune at this time, leading to conceptual and technical > design reports. / > / > / > /There is unanimous agreement that maintaining US leadership and > continuing experience in experiment design and construction --- > especially in accelerator R&D and construction --- is critical to > achieving our universal particle physics' scientific goals. To this > end a balanced program of construction in the next decade and R&D > towards new instrumentation and accelerator technologies targeting the > decade after is every bit as important as our pure science goals./ > > > best > Chip > --------------------------------------------------------------- > Raymond Brock * University Distinguished Professor > Department of Physics and Astronomy > Michigan State University > Biomedical Physical Sciences > 567 WIlson Road, Room 3210 > East Lansing, MI 48824 > sent from: [log in to unmask] <mailto:[log in to unmask]> > > cell: (517)927-5447 > MSU office: (517)353-1693/884-5579 > open fax: (517)355-6661 > secure fax: (517)351-0688 > Fermilab office: (630)840-2286 > CERN Office: 32 2-B03 * 76-71756 > > Twitter: @chipbrock > Home: http://www.pa.msu.edu/~brock/ <http://www.pa.msu.edu/%7Ebrock/> > ISP220: http://www.pa.msu.edu/courses/ISP220/ > ISP213H: http://www.pa.msu.edu/courses/2007spring/ISP213H/ > Facebook: http://msu.facebook.com/profile.php?id=2312233 > > > > > > > > > > ------------------------------------------------------------------------ > > 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