STAR HardProbes PWG

[Rosi Reed <rosijreed AT lehigh.edu>]

Hi Rachael,

I have some additional comments on your slides.

Slide 3: 99.995c -> 0.999998c I believe for 510 GeV, which is your collision energy.

Slide 4: Please use the newer version of this picture that shows the EPD (I believe Tristan has a copy).

Slide 5: At 510 GeV -> at center of mass energy of 510 GeV or sqrt(S_NN) = 510 GeV

I think it makes more sense to switch slide 4 and 5, so that you talk about what you want to measure, then discuss STAR and the specifics of your analysis.

Slide 6: Note that the VPD difference cut removes pile-up

Slide 7: Please move the legend so it's not overlapping the edge of the plot.  I think you need better descriptors for the 3 distributions in the legend.  Let's discuss this during group meeting today.

Slide 8: I agree with the previous comments that this is too busy.  I think it would be nice to split it into 2 slides, so that you can discuss the MTD a little more, as this is the main detector you will be using.  (At least most of your audience will have heard of how the TPC works since every STAR analysis uses it.)  I know you put in the details based on my earlier comments - these are important but I think the MTD matching needs some cartoon to help your audience understand, even if it a block diagram in powerpoint.

I think you're missing a little bit of the story so far - perhaps we  can remove slide 6 since it doesn't really explain a critical detail for your analysis and use that to discuss the methodology a little bit. 

Slide 9: Mention which tof cuts you'll use

Slide 10: Probably you should mention the QM2019 results from Chan-Jui Feng ( https://drupal.star.bnl.gov/STAR/files/QM19poster_chanjui_v9.pdf) since they're from 2017.  Actually, I think you're showing the preliminary and the final from the same data?  Let's perhaps remove the left plot and put something from Chan-Jui here. 

Slide 11: Describe how you fit more precisely.  Also, I don't think I would agree that the purple is the combinatorial background, that should be represented by the yellow.  The purple really contains some more physics processes like the Drell-Yan - if there weren't anything like that, then the amplitudes of your like and unlike sign distributions would be the same outside of the J/psi invariant mass.

Actually, can you have this plot go out to 3.8 GeV?  I can see what seems to be the small hint of the psi' there on the edge, we shouldn't cut it out.

I think a plot of the multiplicity since this is what you'll be using would be useful. 

Cheers,

Rosi

On Tue, Oct 18, 2022 at 8:40 AM Barbara Trzeciak via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi Rachael,

please find below my comment on your nice slides.

- s5: for physics motivation, I would suggest adding here some existing results on J/psi production vs multiplicity.

- s5: add also information that you measure J/psi via the dimuon decay 

- s8: it's quite busy, try to reduce the text or I would also suggest to move: "Particle identification (PID) cuts on ∆TOF, DCA, ∆z, ∆y∗q, and mass applied" and the sub-bullets to a separate slide. You mention these requirements and the MTD matching which are important for your muon identification - I think they deserve more explanation (even than the nSigmaPion) to people and maybe you can add some plots. I'm missing information related to MTD (you could also consider describing more the detector itself). 

- s10: looks that you're still missing text here

- s11: Add information how you determine the background

- s12: through the invariant mass of the decay -> through the invariant mass of the decayed muons

Cheers,

Barbara

On Mon, Oct 17, 2022 at 4:10 PM Sooraj Radhakrishnan via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi Rachael,

    These are nice slides. Please find a few comments from me below. I sign off with them implemented

S4: Figure overlaps test on left

S5, 2nd bullet: Shouldnt this be multiplicity dependence of quarkonia yields?

S5: Using data from p + p collisions 

S7: TPC clusters --> TPC hits

S7: Remove 'applied to blue and teal nHitsFit, nHitsDedx,and nHitsRatio'

S7: On the plot change labels to match text, cuts --> track quality cuts, matching --> MTD matching

S7: Last bullet: Instead of current one better to briefly describe what MTD matching means

S8: Is the DeltaTOF here from MTD? Better to indicate that

S9: Do you need both slides 9 and 10? Doesnt S10 suffice?

S11: using crystal ball function for the mass peak

S11: Do you exclude the Psi(2S) mass region when fitting?

S12: QA is more a STAR lingo. Also what do you mean pT spectra allows to identify muon candidates? Better to summarize which detecctors/quantities have been used in muon identification

S13: I dont think for STAR talks we give personal acknowledgements to STAR Collaborators for their contribution to the talk/results

thanks

Sooraj 

On Mon, Oct 17, 2022 at 10:33 AM Nihar Sahoo via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hello Rachael,

Please find my comments on your nice presentation slides.
With these implemented I sign off.

Slide5: "       Using p + p at 510 GeV from 2017 " -> "Using p + p at
$sqrt($s$)=510 GeV from 2017 data taking"
Slide6:  please mention vx, vy, and vr; Include dataset information in
plot
Slide7:Include dataset information in plot
Slide8: Include dataset information in plot;
Slide9: Include dataset information in plot

Cheers
Nihar

On 2022-10-15 01:47, webmaster--- via Star-hp-l wrote:
> Dear Star-hp-l AT lists.bnl.gov members,
>
> Rachael  Botsford (rab420 AT lehigh.edu) has submitted a material for a
> review,
> please have a look:
> https://drupal.star.bnl.gov/STAR/node/61343
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> Deadline: 2022-10-27
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--

Sooraj Radhakrishnan

Research Scientist,

Department of Physics

Kent State University

Kent, OH 44243

Physicist Postdoctoral Affiliate

Nuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road

Berkeley, CA 94720

Ph: 510-495-2473

Email: skradhakrishnan AT lbl.gov

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--

Rosi Reed
RHIC/AGS UEC member
Associate Professor, Physics Department
Lehigh University
(610)758-3907
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