sPHENIX is a new detector at RHIC.

[Edward Kistenev <kistenev AT bnl.gov>]

Dear Gunter, 
I wander if this discussing will be complete if we ignore the relations 
between resolution and Pt range where deconvolution can be reliably made 
under rather well known projected statistical significance of the data. If 
UPP estimates are considered as “reliably attainable” then the “actual” 
values measured in  testing or even computed from simulation could be 
interpreted in terms of  potential for increasing the reach without growing 
the cost.

My two cents.
                                Edward



On Apr 27, 2018, at 9:39 AM, Gunther M Roland <rolandg AT mit.edu> wrote:



Friends,,

Maria just reminded us that we will have a dry-run of the CD-1 review plenary 
talks next Wednesday. I am not sure we will quite have the final plots at 
that time, but we need to figure out what the line of argument is going to be.

We have a nice set of new simulations for the MIE configuration for e.g. jet 
energy resolution and various physics plots. I'm now thinking of how to make 
the connection to the UPPs for the OPA talk, and I'm finding that not so 
easy. 

As an example, the Jet resolution UPP in my notes is "Jet resolution of < 
150%/sqrt(E)" (did we specify at which E, as the resolution does not go as 
sqrt(E), but has a constant term from the AuAu underlying event?). Our 
simulations however show a resolution that is much better than that. E.g. 15% 
at 50GeV from simulations vs 150%/sqrt(50) = 21% from the UPP. 

So, my questions/suggestions:
- I assume it is ok if the UPP is somewhat relaxed compared to the 
performance in simulations?
- We probably should add a line on the performance plots reflecting the UPP 
performance
- We should add a set of points corresponding to the UPP performance to the 
physics plots
- for the physics plots, one needs some to provide some scale of why we want 
to reach a certain performance. I'm planning to argue that we want comparable 
performance to that at LHC (e.g. gamma-jet balance uncertainties, Upsilon 
resolution). Any better ideas?
- for the t-shirt plot, it would be nice to have for comparison also the 
current RHIC status (applies only to jets/hadron RAA) and a backup plot of 
how much the MIE vs reference acceptance costs us

Question to Dennis/Rosi: Any chance of getting a photon resolution plot from 
simulation to compare to the photon UPP of <15%/sqrt(E) photon resolution? I 
think it would be good to fold this into the physics plot. 

Question to Tony: Where can I find the latest Upsilon mass plot for pp? The 
UPP (Y(1s) mass resolution < 100MeV) probably needs to refer not just to the 
system, but also specific running conditions: single central Au+Auevent, max 
pileup, average pileup? It would be good to have a comparison of the 
resolution for pp, single central Au+Au and central Au+Au at max pileup 
(beginning of store) to see where we stand.

Cheers,

Gunther

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