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Re: [[Star-cf-l] ] [Starpapers-l] Notes for PWGC preview (04/26/2024): First observation of d-Λ correlation in heavy-ion collisions
- From: "Hu, Yu" <yuhu AT bnl.gov>
- To: STAR Correlations and Fluctuations PWG <star-cf-l AT lists.bnl.gov>
- Cc: "nxu AT lbl.gov" <nxu AT lbl.gov>, Zbroszczyk Hanna <hanna.zbroszczyk AT pw.edu.pl>, "xialeij AT mails.ccnu.edu.cn" <xialeij AT mails.ccnu.edu.cn>, Ke Mi <mike1996 AT mails.ccnu.edu.cn>
- Subject: Re: [[Star-cf-l] ] [Starpapers-l] Notes for PWGC preview (04/26/2024): First observation of d-Λ correlation in heavy-ion collisions
- Date: Sat, 31 Aug 2024 02:00:29 +0000
Sent: Friday, April 26, 2024 18:11
To: STAR Papers Discussion List <starpapers-l AT lists.bnl.gov>
Cc: skradhakrishnan AT lbl.gov <skradhakrishnan AT lbl.gov>
Subject: [Starpapers-l] Notes for PWGC preview (04/26/2024): First observation of d-Λ correlation in heavy-ion collisions
Date: 04/26/2024
Participants: Ke Mi, Nu Xu, Xialei Jiang, Xin Dong, Yuanjing Ji, Yu Hu, Jae Nam, Xiaoxuan Chu, Hanna Zbroszczyk, Prithwish Tribedy, Subhash Singha, Zhenyu Chen, Yi Yang, Shuai Yang, Yue Hang Leung, Barbara Trzeciak, ShinIchi Esumi, Sooraj Radhakrishnan
Title: First observation of d-Λ correlation in heavy-ion collisions
PAs: Xin Dong, Yu Hu, Yuanjing Ji, Xialei Jiang, Xiaofeng Luo, Ke Mi, Zhi Qin, Zhigang Xiao, Nu Xu
Target journal: Phys. Rev. Lett.
Proposal page: https://drupal.star.bnl.gov/STAR/blog/huyu/First-observation-deuteron-Lambda-correlation-heavy-ion-collisions-0
Presentation: https://drupal.star.bnl.gov/STAR/system/files/dLambdaPaperProposal-Discussion-YuHu-PWGC.pdf
The PWGC panel previewed a paper proposal from HP PWG. The panel found that the analysis is mature and results are important and interesting, and the paper should move forward. The journal choice was also found to be appropriate. The following points were discussed.
Q: Slide 12 (Fig. 3), what are the color densities on the plots?
A: This represents the probability densities
C: Please move the text away from the band on the top left plot
A: Yes, will do
Q: What are the model calculations shown on Fig.4 (slide 13)?
A: These are from pion-less effective range theory and a few other models. For the doublet state constraints from Hypertriton binding energy are used.
Q: What are the goodness of fit on Figure 2 (slide 11)?
A: This is close to 1, we will add on Figure 2
Q: Slide 6, is there any calculation or study that shows the d-Sigma/Xi correlations are large and if it is large, that the decay won't impact the measured correlations?
A: There is no measurement currently of d-Sigma/Xi correlations. At this energy, the feed-down contribution is smaller, compared to higher collision energies. Since there are no measurements of d-Sigma/Xi correlations (and also very limited model calculations for d-Sigma and none for d-Xi) we have not included any feed-down correction. We will clearly state in the paper that feed-down corrections are not done
Q: Slide 6, could you explain why if the d-Sigma/Xi correlation is small why there will be upward correction?
A: This is because the measured signal will be diluted by the feed-down
Q: Where is the 25% correction factor coming from
A: This is from thermal model calculations for the feed-down
Q: Since you use a large pT range for deuteron and lambda, should you do any efficiency correction? If there is a dependence on pT, the efficiency correction could impact.
A: Since the correlation function is taken as ratio of same and mixed events, efficiency largely cancels out. The CF does change with pT, from the change in space momentum correlations, but we expect the impact from efficiency correction will be small. We have seen that for other similar correlation measurements for.eg pion pairs, the impact of efficiency correction is very small
Q: In the L-L fit, you assume the strong interaction parameters are independent of centrality. Did you check if you don't put this constraint, you get same results? Because the mu_B at freeze-out depend on centrality, could this be different?
A: For d-lambda correlations, we don't have enough statistics to see any impact. But it has been checked in p-p and p-lambda correlations that there is no centrality dependence. It also expected that f0 does not change with density
Q: Since you are using same marker style for all the models, might be difficult to discuss in the paper. Could use different markers
A: Yes, we will consider this
Q: Figure 4 (slide 13), why is the uncertainty estimate from this study asymmetric while from other measurements are symmetric?
A: This study uses Bayesian analysis to evaluate the probability distributions for f0 and d0, and that causes the asymmetric uncertainty for the binding energy. Other measurements are from different methods
Q: In the formalism, is there any assumption of thermalization for the common source to extract the source parameters?
A: No, there is no assumption of thermalization
Physicist Postdoctoral Affiliate
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road
- Re: [[Star-cf-l] ] [Starpapers-l] Notes for PWGC preview (04/26/2024): First observation of d-Λ correlation in heavy-ion collisions, Hu, Yu, 08/30/2024
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