sPHENIX is a new detector at RHIC.

["Perepelitsa, Dennis" <dvp AT bnl.gov>]

Hi Megan,

This looks like a nice set of slides. 

Even though we have newer performance plots from the Collaboration Meeting which explore our ability to measure jets in Au+Au collisions with the most realistic G4 simulations to date, I agree with your strategy of sticking to previously shown MIE proposal and QM17 plots until our public note circulation & approval process is complete.

Besides this, I have just two comments: 

1. I think one has to be a little careful with slides 5-7. The numbers in the orange box are not uniformly used for all of the projections you show. Just for example, I believe for the prompt photon RAA projections we made in late 2014, we assumed that (1) one could successfully trigger on high-pT photons in Au+Au and (2) one could take events from all z-vertex positions, so in total this represents much more than the 20 billion Au+Au 0-20% events recorded with the MB trigger inside |z| < 10 cm. In any case, I would stress that the plots on slides 5-7 are based on the particular set of projections we made while preparing the MIE proposal document and as you note in slide 9 we are incorporating more specific, updated guidance from C-AD and are in the process of fleshing out a full run plan.

2. You discuss photon-tagged fragmentation functions on slides 26-28, but I found the connection between the text and plots somewhat hard to follow. Some suggestions:

A. On slide 27, you talk about how RHIC is ideal for measuring direct photons — could it make sense to show a plot on photon reconstruction in Au+Au? 

B. I think the plots on the bottom of slide 27 are supposed to back up your second bullet point, but that’s not visually evident (the LHC plot has as much of a “shift” as the RHIC one) — could I suggest to show the bottom two panels in the JEWEL projections in Fig 1.33 of the MIE proposal instead? 

C. From slide 28, one gets the impression you are suggesting we measure reaction-plane-dependent-photon-tagged-jet-fragmentation-functions, which would be an incredibly selective measurement… perhaps slide 28 is intended to talk about photon-tagged measurements more generally?

Good luck with the talk, 

Dennis

On Jun 19, 2017, at 6:51 PM, Megan Connors <meganEconnors AT gmail.com> wrote:

Dear all,

My slides for tomorrow's jet workshop at the users meeting can be found here:

https://www.dropbox.com/s/obaog2to4djgytc/sphenix_AUM2017_jets_connors.pdf?dl=0

Sorry for the late posting. It needs to be finalized by Tuesday by noon.

Thanks,

-Megan

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Dennis V. Perepelitsa

Assistant Professor, Physics Department

University of Colorado Boulder