Skip to Content.
Sympa Menu

sphenix-l - [Sphenix-l] UPP questions

sphenix-l AT lists.bnl.gov

Subject: sPHENIX is a new detector at RHIC.

List archive

Chronological Thread  
  • From: Gunther M Roland <rolandg AT mit.edu>
  • To: "jhuang AT bnl.gov" <jhuang AT bnl.gov>, "Perepelitsa, Dennis" <dvp AT bnl.gov>, Rosi Reed <rosijreed AT lehigh.edu>, "lajoie AT iastate.edu" <lajoie AT iastate.edu>, "O'Brien, Edward" <eobrien AT bnl.gov>, "Haggerty, John" <haggerty AT bnl.gov>, Glenn Young <glennyoung82251 AT gmail.com>, "Frawley, Anthony" <afrawley AT fsu.edu>, "Morrison, David" <morrison AT bnl.gov>
  • Cc: "sphenix-l AT lists.bnl.gov" <sphenix-l AT lists.bnl.gov>
  • Subject: [Sphenix-l] UPP questions
  • Date: Fri, 27 Apr 2018 13:39:20 +0000



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





Archive powered by MHonArc 2.6.24.

Top of Page