sPHENIX cold QCD topical group

[John Lajoie <lajoie AT iastate.edu>]

Hi Nils,

    Very nice looking slides! Just a few comments -

To expand on Christine's comment about DY below the J/Psi peak, I know I have mentioned this as a possible work for the future but I am less enthusiastic about it recently.  One of the things you get by going lower in mass is better statistics, but even above the J/Psi with the running we are planning the limitation is the systematic error in the ratio R_pA which is driven by the <Ncoll> determination.  That won't change as you go lower in mass. In principle the background situation will improve if we remove the piston, but I bet it will get worse again when we add a realistic tracker (frames, etc.)  You would get some additional Q^2 reach but not much so that's not much help either.

The bottom line is that IMHO it is best to emphasize we are working with EPPS16 to quantify the effect of a comprehensive nPDF program on our uncertainties - not just the DY (which is important) but including other observables such as gamma+jet and dijets. The goal is to get EPPS16 a set of pseudodata by the end of the summer to look at the effect on multiple nPDFs of the combined dataset.

One other comment - it would be good to include a slide that shows the nominal (notional?) sPHENIX 5-year run plan. I think the STAR folks will be very interested in it as they haven't seen it, and there were questions in Christine's PAC talks as well as the AUM spin session, so it will likely come up again.

John

On 6/26/2017 6:52 AM, Aidala, Christine wrote:

Hi, Nils.  Nice talk!  I just have a few comments.

 

p. 14 – I would be cautious in talking about trying to reconstruct D-Y below the J/Psi mass.  I expect this to be extremely challenging. 

 

p. 15 – I wouldn’t say “test” DGLAP and BFKL evolution.  Maybe “relate via” DGLAP and BFKL evolution. 

 

p. 16 – Right now the text on the slide has the 1-10% for SIDIS transverse single-spin asymmetries mentioned right below the ~15% pi0 asymmetries.  It would be nice to more clearly contrast the 1-10% for _all_ SIDIS asymmetries, including positive pions, with the up to 40% asymmetries seen for positive pions in p+p that are shown in the plot.

 

Christine

 

 

From: sPHENIX-cold-QCD-l [mailto:sphenix-cold-qcd-l-bounces AT lists.bnl.gov] On Behalf Of Joe Osborn
Sent: Sunday, June 25, 2017 9:14 PM
To: Nils Feege <nils.feege AT stonybrook.edu>
Cc: sphenix-cold-qcd-l AT lists.bnl.gov
Subject: Re: [Sphenix-cold-qcd-l] Draft slides for RBRC workshop talk Tuesday, 6/27

 

Hi Nils,

 

I just have one small comment. On page 21 I would additionally put the actual p_out distributions as a figure on this slide to give the current figure some context - that way the audience can have some sense as to where these Gaussian width points are coming from.

 

Good luck with your talk!

 

Joe Osborn

 

 

---------------------------------------

 

Joe Osborn

Ph.D Candidate

University of Michigan

jdosbo AT umich.edu

(859) 433-8738

 

On Sat, Jun 24, 2017 at 6:32 PM, Nils Feege <nils.feege AT stonybrook.edu> wrote:

Hi all,

 

Please find the draft slides for my presentation

 

"sPHENIX with Forward Instrumentation at RHIC: What Can We Learn with It?"

 

for the RBRC workshop "Synergies of pp and pA Collisions with an Electron-Ion Collider" at BNL next week at:

 

https://www.phenix.bnl.gov/WWW/p/draft/nfeege/rbrcJune2017/nfeege_RBRC_Workshop_BNL_2017_06_27.pdf

 

https://www.phenix.bnl.gov/WWW/p/draft/nfeege/rbrcJune2017/nfeege_RBRC_Workshop_BNL_2017_06_27_wNotes.pdf

 

The second link is for the slides with the Presenter notes, if you want to see the points I'm planning to make on each slide. The talk is scheduled for 30 minutes, and I'm aiming for 25+5.

 

If you have comments or suggestions, please send them to me by Monday 6/26 evening (8pm EDT).

 

Best,

Nils

 

--

Dr. Nils Feege

Research Assistant Professor

 

SUNY at Stony Brook

Department of Physics & Astronomy

Stony Brook, NY 11794-3800

 

e-mail nils.feege AT stonybrook.edu

skype nils1920

phone +1-631-632-8710

 

www.linkedin.com/in/nilsfeege

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John Lajoie

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Contact me: john.lajoie