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SNOWMASS-EF  August 2013

SNOWMASS-EF August 2013

Subject:

Re: materials for EF conveners meeting tomorrow

From:

"Graham W. Wilson" <[log in to unmask]>

Reply-To:

snowmass-ef Snowmass 2013 Energy Frontier conveners <[log in to unmask]>

Date:

Fri, 23 Aug 2013 11:11:13 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (100 lines)

Hi Rick,

      I haven't followed the hadron collider Higgs self-coupling 
discussion in detail, but from a quick reading of the
draft Higgs report and relevant papers (I couldn't find ref 69), it 
seems clear that double-Higgs production statistics
is likely to be a strength of VLHC. But how much this translates into a 
Higgs self coupling measurement
and in particular a model-independent measurement of the Higgs 
self-coupling when there is a 30% error on
the theoretical cross-section and many different non HHH coupling 
contributions to final states with HH is not clear at all.
So I don't think your "likely the best place for Higgs self-coupling" is 
supported by the current documentation.

       regards
             Graham

On 8/23/2013 9:45 AM, Rick Van Kooten wrote:
> On 8/22/13 8:57 PM, Peskin, Michael E. wrote:
>>
>> Dear Colleagues,
>>
>> I attach the most recent versions of the Snowmass Executive Summary 
>> and the
>> EF 5-page summary.    We will discuss these in our meeting tomorrow.
>>
>> The Executive summary got somewhat rearranged.   The frontier conveners
>> wanted the capabilities sections pulled out and merged into a common 
>> section.
>> This means that the accelerator part of the LHC, ILC, and VLHC 
>> discussion
>> occurs much later in the document.  But, please look it over.  I did 
>> insert
>> language on the US leadership in high-field magnets.
>
>   Regarding the current top-level executive summary, I would like to 
> see the _unique_ capabilities of e+e- machines stressed, and as one 
> example:
>
> "They can reach sub-percent precision in the Higgs boson properties, 
> allowing discoveries of percent-level deviations predicted in 
> theoretical models."
>
> to
>
> "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."
>
>   This is just transferring some wording from the longer summary. I 
> believe that we are all agreed that an "all hadron" option, i.e., 
> HL-LHC -> HE-LHC/VLHC would definitely be missing out on important 
> physics and capabilities and we want to make that clear.
>
>   Also a small suggestion: adding "at least", i.e.,:
>
> "They can improve the precision of our knowledge of the $W$, $Z$, and 
> top properties by at least an order of magnitude".
>
>>
>> As to the rest of the VLHC discussion, let's talk about it tomorrow.  
>> The
>> new particles group would like a stronger endorsement of VLHC in the 
>> executive
>> summary.  I am rather cool to this, because the VLHC is not on the table
>> now.  It would be good to get more opinions from the members of
>> our group.
>
>   There is no denying that a ~100 TeV VLHC brings a lot to the table 
> (including likely the best place for Higgs self-coupling) and we 
> should say this, but with the caveats that Graham clearly points out.  
> I do like Ashutosh's suggested wording encouraging a conceptual design 
> report which is what would be needed to come to more solid 
> conclusion.  We could preface his encouraging statement with "Although 
> beyond the 20-year timeline of this report, further investigations of 
> the physics and technical issues would be opportune at this time..." 
> (and indeed the same holds true for TLEP).
>
>   Regards,
>                 Rick
>
>


-- 
Graham W. Wilson
Associate Professor
Dept. of Physics and Astronomy
University of Kansas
Lawrence, KS 66045
Office Tel.   785-864-5231
Web: http://heplx3.phsx.ku.edu/~graham/

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