Snowmass on the Mississippi J.P.Delahaye/SLAC

52 pre-meetings in preparation http://www.snowmass2013.org/tiki-index.php 52 pre-meetings in preparation Well attended, 700 registered but not all always present 9 days from which 2 last days of summaries Morning devoted to working groups (Frontiers) Afternoon devoted to colloquium by theme overview presentations by experts panel answering questions excellent discussions fruitful exchange of info and opinions J.P.Delahaye CSS2013 (August 04, 2013)

Major points (my understanding) New panorama with Higgs and large )13 angle discovered last year No sign of new physics (presently and certainly not before large integrated luminosity at higher energy @ LHC) thus several years. US participation to LHC and LHC upgrade strongly supported A Higgs factory (up to Top @ 350 GeV) the only justified facility in the near term future. ILC recognized as the only presently mature enough technology Japan wish to host confirmed (70%of 5B$ material assuming 10%US, 10% EU, 10% Asia) 10% of 5B$ over 10 years = 50M$/year material =120 M$/year US accounting as compared with High Energy DOE budget = 155M$ 1200 FTE per year during 10 years from which 400Japan? + 400 US? +400 EU? Would take all present US resources for High energy, not compatible with LHC upgrade and cancel any other high energy physics in US Only possible with additional budget?????? long timescale (3 years for agreement, 10 years construction, 3 years running with luminosity increase thus 16 years = 2030! J.P.Delahaye CSS2013 (August 04, 2013)

DOE HEP 2014 budget (request) 777 M$

Major points (continued) VLHC (TLEP 80km long) resurrected due to higher physics energy scale E+/E- Higgs factory as first stage 100 TeV proton collider second stageas discovery facility CERN proposal to host taking advantage of existing LHC accelerator facilities Issues to be addressed: 100MW synchrotron radiation, magnets (16T), depolarization during collision (?) TDR in two years (2015)!! J.P.Delahaye CSS2013 (August 04, 2013)

Intensity Frontier summary (J.Hewett) J.P.Delahaye CSS2013 (August 04, 2013)

Intensity Frontier summary (J.Hewett) J.P.Delahaye CSS2013 (August 04, 2013)

Capabilities Frontier summary (W.Barletta) J.P.Delahaye CSS2013 (August 04, 2013)

Capabilities: Summary (W.Barletta) J.P.Delahaye CSS2013 (August 04, 2013)

arXiv:1308.0494 FERMILAB-CONF-13-307-APC J.P.Delahaye CSS2013 (August 04, 2013)

Staged Neutrino Factory and Muon Colliders main parameters (Mark Palmer) Neutrino Factory based on ProjectX ph2 Muon Collider based on ProjectX ph4 J.P.Delahaye CSS2013 (August 04, 2013)

The Physics case (Energy Frontier summary by Chip Brock) Very incomplete statement: Excellent luminosity spectrum at collision at high energy due to the absence of beam-strahlung Potential to extend energy reach of lepton colliders up to 10 TeV colliding beam energy range. ….. J.P.Delahaye CSS2013 (August 04, 2013)

From Chris Tully to Mark Palmer Hi Mark, I thought a bit about the discussions at Snowmass. I've come to the opinion that in order for the muon collider project to break out of the hypothetical phase from the point of view of the energy frontier - one needs to launch an organized technical design report (TDR) that starts with the detectors and performance. The situation with the muon collider is as or more tightly coupled to what the detectors and technologies can tolerate as the HL-LHC. Notice that TLEP successfully launched a study effort with a ~2015 deadline for a TDR (http://tlep.web.cern.ch). China has certainly taken the TLEP/100TeV effort very seriously - and is a current topic of meetings this week in Beijing. There are some younger physicists that might sink their teeth into the muon collider TDR effort if there were tighter deadlines and clear goals. For instance, a true-to-force particle-flow reconstruction as a means of vetoing background particles present in each crossing could sell at the Early Career level. I think there are a number of senior people who could timeshare on such an effort as well. Best, Chris J.P.Delahaye CSS2013 (August 04, 2013)

Moving forward with P5 300 pages document made of summaries from the various Frontier WGs available in about a month? Particle Physics Projects Prioritization Panel (P5) nominated soon: about 25 members representing community chair: Steve Ritz / UCSC Charged to make recommendations for HEP in US during next 10 years based on a budget scenario provided by DOE Deadline: summer 2014 (considered too late) Next Snowmass in about 5 years (2018) J.P.Delahaye CSS2013 (August 04, 2013)