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

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