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Hi, this is a very good question and an important one to discuss. I put 250 as an example, because it is probably the upper limit for any practical circular e+e- machine. If we are sure that we want, and can realistically accomplish more - it eliminates such an option and simplifies the discussion. This is why it is important to have such factors discussed and collect the arguments and opinions.. Best.. Adam ________________________________________ From: Yen-Chu Chen Sent: Tuesday, July 24, 2012 9:40 AM To: Adam Para Cc: Ron Lipton; [log in to unmask] Subject: Re: Muon Collider Physics and Detector Aug 1 11:30 Hi, This is Yen-Chu Chen of CDF. I went to the Muon Collider meeting some time ago but got too busy to continue. For sure after the discovery of a Higgs like particle such accelerator proposal is very interesting and important for the future. However 250 GeV sounds a very well focused energy to study Higgs particle. How about 400 GeV, which allows both Higgs and top quark physics? Generating top quark pairs via electron-positron annihlation, together with a good detector, can produce a very precise measurement of the top quark mass. The production asymmetry of top quark can also be studied in e- e+ (or mu- mu+) collision. Maybe more expansive but we pay more and gain much more. Best regards, Yen-Chu 於 2012/7/24 上午 08:40, Adam Para 提到: > Ron, > good and timely idea. I am wondering if we should not include into the list of topics to discuss/evaluate two circular machines at 250 GeV, one muon and one electron based. This kind of options are likely to surface at Snowmass and more work is done in a coherent fashion - more useful the discussions at Snowmass will be. > > Adam Para > > > On Jul 24, 2012, at 8:28, "Ron Lipton" <[log in to unmask]> wrote: > >> I would like to restart our Muon Collider meetings with a meeting Wednesday, Aug 1 at >> 11:30 in the FIshtank at Fermilab. Given the Higgs-like boson discovery, the will >> be an increased focus on prospects for a s-channel Higgs factory and I would like >> to use this meeting to discuss and organize studies of this option in preparation >> for "Snowmass". Please let me know if you have something to present or would >> like discussed. David Neuffer will present his re-examination of the machine >> in the following meeting, August 8. >> >> >> Ron >> >> Remote access is available at: >> >> To Join the Audio Conference >> Dial-In: 1 (847) 944-7644 Local US - this is the preferred number. >> 1 (888) 762-3768 >> Enter Passcode: 9765689# >> >> ######################################################################## >> Use REPLY-ALL to reply to list >> >> To unsubscribe from the MCD-L list, click the following link: >> https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=MCD-L&A=1 > ######################################################################## > Use REPLY-ALL to reply to list > > To unsubscribe from the MCD-L list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=MCD-L&A=1 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the MCD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=MCD-L&A=1