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On Thu, 25 Apr 2013, Rick Van Kooten wrote: > I had to disconnect at 3:00 p.m. for another meeting so did not know if we > got around to discussing the below. > >> >> ------------------------------------------------------------------------------- >> >> Questions to us from the Cosmic Frontier, to be discussed today: >> >> "HE1": • The message from the LHC seems to be that with data in hand, >> we consistently outperform expectations for extraction of Higgs >> properties. How much is there really for an ILC to contribute? What >> key assumptions are we making now that we could relax with ILC >> inputs? > > Adding to some of the other written input, a key assumption that will be > made when enough stats are collected to allow access to all the other Br's at > the LHC is that there are no invisible and/or exotic/undetectable Higgs > decays adding to the total Higgs width. In a number of projections, the > assumption is often made that all the Br's (also from couplings) will add up > to the 97-98% SM decays accessible to the LHC (i.e., removing charm). A BR(h -> gg) is about 8%, also inaccessible in the decays (though arguably constrainable by production). -Heather > straightforward example of an exotic decay is if the Higgs decayed to non-SM > particles that subsequently decayed hadronically (without heavy flavor) in a > way that would be difficult or impossible to detect with QCD backgrounds at > the LHC. > > Lepton Higgs factories can clearly relax this assumption since they can > measure the total Higgs width in a model-dependent way, and would see _all_ > possible Higgs decays recoiling against the tagged Z in hZ events. The > tremendous power of measuring (directly) the Z width at LEP was that it > definitively tested for _all_ kinematically accessible Z decays. The same > level of test needs to be applied to the Higgs. > > Regards, > Rick > > -- > Rick Van Kooten \ Telephone: (812) 855-2650 FNAL: (630) 840-3859 > Dept. of Physics \ HEP FAX: (812) 855-0440 > Indiana University \ e-mail: [log in to unmask] > Swain Hall West 117 \ http://hep.physics.indiana.edu/~rickv/aboutme.html > Bloomington, IN 47405 > > ######################################################################## > 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