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Subject: sPHENIX is a new detector at RHIC.
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Re: [Sphenix-l] Slides approval for HEP2023 conference
- From: "Perepelitsa, Dennis" <dvp AT bnl.gov>
- To: Sebastian Tapia Araya <s.tapia AT cern.ch>
- Cc: "sphenix-l AT lists.bnl.gov" <sphenix-l AT lists.bnl.gov>
- Subject: Re: [Sphenix-l] Slides approval for HEP2023 conference
- Date: Thu, 12 Jan 2023 15:58:58 +0000
Hi Sebastian,
Thanks for circulating these draft slides and representing sPHENIX at the HEP conference!
I particularly like your stepping through the installation schedule on slide 39+ and showing the realization of those plans step by step.
Please consider some comments below.
Dennis
—
Slide 2: perhaps “sPHENIX will complete … “ ?
Slide 3: “inner workings” ?
Slides 4+: I think these 3-d renderings / engineering drawings of the experiment are not the latest ones. Dave Morrison maintains the latest and greatest ones here: https://bnlbox.sdcc.bnl.gov/index.php/s/tDHkYzzETHfaLJE - maybe you can find an attractive replacement?
Slide 13 and 36: you might be a bit more circumspect on the exact start of physics data-taking. The nominal plan is to start “commissioning” in April, with a potential plan to try to start earlier in late March instead. How long will the “commissioning” phase be vs. the “physics data-taking” phase? We don’t know. I don’t think we can really say “May” for physics data-taking. Maybe you could write “first beams expected in late Spring” ? (or March/April?)
Slides 16-17: I get that this is mostly for demonstration purposes, but it seems a bit funny to not have any sPHENIX plots here. Maybe you can re-produce the sPHENIX jet RAA projection plot, and point out the extreme kinematic range in detail — how sPHENIX will meet up with the LHC kinematic range on the high end but also push very low in pT
Slides 18-20: the flavor fraction difference between gamma+jet and inclusive-jet is a good motivation at the LHC, but actually less so at RHIC — inclusive jets at RHIC are also significantly quark-dominated. Instead, you might say that the gamma+jet channel will be a very valuable way to select calibrated initial populations of jets at both RHIC and LHC for comparison. (I also was not sure how this channel gets at the path-length dependence?)
Slide 22: we happen to have a projection of z_g here, but if somebody asks about other sub-structure observables — you could just say that we expect to have a huge population of reconstructed jets for study — something like 10^6 pT > 30 GeV jets in 0-10%. So we expect that our jet sub-structure program will go as far as our creativity can take us!
Slide 23-24: for the ATLAS measurement (and also CMS b-jet measurements), the jet pT is very, very high compared to the b-quark mass, so it is a question how much the dead cone effect could really contribute - i.e. the difference between the b-jets and inclusive jets might just be another manifestation of the q vs. g difference. But in sPHENIX, there is an opportunity to measure b-jets in a range much closer to the b-quark mass, so the mass effect should be a lot more relevant. That is the point I would make here.
Slide 25: some of the text on the left “shifts” between slides 24 and 25 - not sure if that’s just my PDF viewer (and also the title: “b-tagged” slide 23 vs. “B-tagged” slide 24)
Slide 26: I wasn’t quite sure what the “geometry dependence” aspect is…
Slide 28: You don’t say much about small systems, but you could imagine including our projection plot of the charged-hadron & jet or D0 v2 in p+Au collisions here
Please consider some comments below.
Dennis
—
Slide 2: perhaps “sPHENIX will complete … “ ?
Slide 3: “inner workings” ?
Slides 4+: I think these 3-d renderings / engineering drawings of the experiment are not the latest ones. Dave Morrison maintains the latest and greatest ones here: https://bnlbox.sdcc.bnl.gov/index.php/s/tDHkYzzETHfaLJE - maybe you can find an attractive replacement?
Slide 13 and 36: you might be a bit more circumspect on the exact start of physics data-taking. The nominal plan is to start “commissioning” in April, with a potential plan to try to start earlier in late March instead. How long will the “commissioning” phase be vs. the “physics data-taking” phase? We don’t know. I don’t think we can really say “May” for physics data-taking. Maybe you could write “first beams expected in late Spring” ? (or March/April?)
Slides 16-17: I get that this is mostly for demonstration purposes, but it seems a bit funny to not have any sPHENIX plots here. Maybe you can re-produce the sPHENIX jet RAA projection plot, and point out the extreme kinematic range in detail — how sPHENIX will meet up with the LHC kinematic range on the high end but also push very low in pT
Slides 18-20: the flavor fraction difference between gamma+jet and inclusive-jet is a good motivation at the LHC, but actually less so at RHIC — inclusive jets at RHIC are also significantly quark-dominated. Instead, you might say that the gamma+jet channel will be a very valuable way to select calibrated initial populations of jets at both RHIC and LHC for comparison. (I also was not sure how this channel gets at the path-length dependence?)
Slide 22: we happen to have a projection of z_g here, but if somebody asks about other sub-structure observables — you could just say that we expect to have a huge population of reconstructed jets for study — something like 10^6 pT > 30 GeV jets in 0-10%. So we expect that our jet sub-structure program will go as far as our creativity can take us!
Slide 23-24: for the ATLAS measurement (and also CMS b-jet measurements), the jet pT is very, very high compared to the b-quark mass, so it is a question how much the dead cone effect could really contribute - i.e. the difference between the b-jets and inclusive jets might just be another manifestation of the q vs. g difference. But in sPHENIX, there is an opportunity to measure b-jets in a range much closer to the b-quark mass, so the mass effect should be a lot more relevant. That is the point I would make here.
Slide 25: some of the text on the left “shifts” between slides 24 and 25 - not sure if that’s just my PDF viewer (and also the title: “b-tagged” slide 23 vs. “B-tagged” slide 24)
Slide 26: I wasn’t quite sure what the “geometry dependence” aspect is…
Slide 28: You don’t say much about small systems, but you could imagine including our projection plot of the charged-hadron & jet or D0 v2 in p+Au collisions here
Additionally, besides b-jets, there is not much on the HF or Upsilon program - I suggest to add a slide about that part of the physics program? If you feel pressed for space, you could remove the slide about the beam pipe — it’s ultimately a “fun”
story (since it had a good outcome) but not really scientifically necessary …
Slides 33-34: I would add simple labels here (“IHCal installation into bore of magnet”, “EMCal sectors installed inside IHCal”) like you have on slides 32 and 35. I think this will help the audience...
Slides 33-34: I would add simple labels here (“IHCal installation into bore of magnet”, “EMCal sectors installed inside IHCal”) like you have on slides 32 and 35. I think this will help the audience...
On Jan 11, 2023, at 10:26 AM, Sebastian Tapia Araya via sPHENIX-l <sphenix-l AT lists.bnl.gov> wrote:
Dear All,
I’m sharing slides to be approved for the talk “The sPHENIX experiment at RHIC” to be given at conference HEP2023 in Valparaiso, Chile.
Link to conference: https://indico.cern.ch/event/1158681/
The talk is plenary and scheduled for this Friday.
Thanks,Sebastian.
_______________________________________________Click to Downloadsphenix_overview_v1_HEP_sTapia.pdf54,3 MB
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Dennis V. Perepelitsa
Associate Professor, Physics Department
University of Colorado Boulder
on sabbatical at Brookhaven National Laboratory
Associate Professor, Physics Department
University of Colorado Boulder
on sabbatical at Brookhaven National Laboratory
-
[Sphenix-l] Slides approval for HEP2023 conference,
Sebastian Tapia Araya, 01/11/2023
- Re: [Sphenix-l] Slides approval for HEP2023 conference, Perepelitsa, Dennis, 01/12/2023
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