U.S. ATLAS HL-LHC Upgrade Level 2 and Deputies-NSF only Management Mailing List

[Elliot Lipeles <lipeles AT hep.upenn.edu>]

Hi Hal,

For HTT two details:

-- Each loss of HTT scope corresponds to raising the jet trigger thresholds by ~2.5 GeV, which leads to 5% loss in HH->bbbb cross-section sensitivity

       -- just to be clear if we cut the system by 17% you lose  5% lose in HH->bbbb, and 33% you lose  10% lose in HH->bbbb. It might be slightly worse than this because the b-tagging would also be degraded, but that is really really hard to estimate.

-- The dates for the decision should probably be ~July-23 at PRR

Elliot

On Tue, Jul 16, 2019 at 9:49 AM Hal Evans <hgevans AT indiana.edu> wrote:

Hi all,

I've compiled all of your scope contingency/opportunity numbers into the
attached table. I made a few minor modifications.

1. Trigger: I included an additional Trigger Opportunity - updating the
gFEX algorithms for Phase-2.

2. Opportunity Dates: some of these were given only at the granularity
of a year. I updated those to MMM-YY format, choosing a date arbitrarily.

Please have a look and let me know if I've made any mistakes.

Having this all compiled together highlights the fact that we are very
thin on Physics impact/motivation for the contingency/opportunities. I
realize that this will be difficult, but we should really include some
sort of discussion of how these decisions could affect ATLAS physics.
This can be hand-wavy (but obviously the more quantitative the better).
The point is to demonstrate that we've thought about this NSF
requirement for scope contingency/opportunity.

Please try to get me some input on this by Thursday.

Thanks  -  Hal

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