jiyj's blog

2, BES II H3L progress:
- Still work on analysis note
- In addition to analysis details (each PA prepares separate notes), prepare a separate note for results discussion and models

2024/03/07
1,Update on 5.2 GeV H3L production -Yulou
https://drupal.star.bnl.gov/STAR/system/files/BESII_h3l2b_5p2_yulou%20-%20240305.pdf
- Add the fraction of (measured H3L yields / integrated H3L pT>0 yields) in the figures on slide 9

2024/2/27
1, report to the PWG about the shrink of the He3 and He4 acceptance

2024/2/20
1, Update on He4L at Au+Au 3 GeV - Fengyi
https://drupal.star.bnl.gov/STAR/system/files/Update_20240219_FengyiZhao.pdf
- compare the chi2 of the fitting for H4L (and He4L) at 1, BW (n=1 fixed); 2, BW (n not fixed); 3, mT-exponential
2, Comparison of H3L yields at 5.2 GeV between P21id and P23ie datasets - Yulou
https://drupal.star.bnl.gov/STAR/system/files/QuickCheckofDiffBetweenDataWithDiffSLFor5.2GeV_yulou%20-%2024_2_21.pdf
-Report to LF PWG
-Check nHitsFit and nHitsMax distribution

2024/2/6
1, Dongsheng - https://drupal.star.bnl.gov/STAR/system/files/dsli_240207.pdf

2024/2/3
Followed by last week's discussion. Yulou sent the check to Yuri:
https://drupal.star.bnl.gov/STAR/system/files/Check_DifferenceOfAcceptance_DataUsingDifferentStarLibrary_yulou_20240203.pdf
Yuri reply that the differences are coming from backgrounds.

We recollect the slides and send to Yuri again:
https://drupal.star.bnl.gov/STAR/system/files/P23ie_check_Feb07.pdf - Yuanjing
Yuri said he did not change any cuts but just redo the dE/dx calibration. the only difference is no nHitsFit/nHitsPoss>0.52 cut.
Yulou :
https://drupal.star.bnl.gov/STAR/system/files/Check_signalacceptance_yulou%20-%2020240229.pdf

2024/1/30
1, Check on the He3 acceptance in P23ie and P21id - Yulou
https://drupal.star.bnl.gov/STAR/system/files/Check_signalacceptance_yulou%20-%20240131%20%281%29.pdf
- Follow up with PWG and TPC team
- Related study from Yue Xu: https://drupal.star.bnl.gov/STAR/system/files/Acceptanceindffproduc_NewBichsel.pdf
2, Update on the He4L at 3 GeV - Fengyi
https://drupal.star.bnl.gov/STAR/system/files/He4L_Production_Update_20240131.pdf
- Barlow test on the extrapolation seems strange, including some sys uncertainties in the stat errors
- Decay phase space/Dalitz plot weighting: try two dimension weighting
- Uncertainties from the branching ratio
- Try using Blast-Wave function to describe the H4L (try re-fitting since in the published data, do not fix n=1)
- Why He3 and triton mean pT are different in both 200 GeV and 3 GeV
- If statistics feasible, maybe look at centrality dependence of mean <pT> and pT/centrality dependence of H4L/He4L ratio
3, Other issues: the coming SQM abstract plans:
- A=4 hypernuclei
- Isobar hypernuclei
- Energy dependence of H3L
4, Future paper plans on He4L:
- He4L lifetime
- 3 GeV He4L dN/dy
- Energy dependence of He4L and H4L

2024/1/24
1, Check on pXi peak
https://drupal.star.bnl.gov/STAR/system/files/dsli_240124.pdf
2, Collection of H3L analysis methods
https://drupal.star.bnl.gov/STAR/system/files/20240124_yingjie_H3L_systematic_uncertainty_final_v0.pdf
3, Update on 3.2 GeV and 3.5 GeV He4L - Chenlu

2024/1/19 (back up for discussions)
1, H3L branching ratios: https://drupal.star.bnl.gov/STAR/system/files/H3L_branchingratio.pdf - Yue Hang
2, Thermal model: https://drupal.star.bnl.gov/STAR/system/files/Thermal.pdf Yuanjing

2024/01/16
1, Update on 5.2 GeV H3L - Yulou
https://drupal.star.bnl.gov/STAR/system/files/Update%20of%205.2GeV_yulou%20-%2023_1_17.pdf
- try run full statistics using newly produced dataset
2, Check on the M(Lambda+Lambda) - Dongsheng
- possible contribution from pXi channel since pXi has a strong correlation at k*->0
https://drupal.star.bnl.gov/STAR/system/files/dsli_240117.pdf

2024/01/09
1, Reconstruction of double Lambda - Dongsheng
https://drupal.star.bnl.gov/STAR/system/files/dsli_240110.pdf
- Based on Xi experience, Xi->Lambda pi, sometimes (p1+pi1)+pi2 mis-reconstruct as (p1+pi2)+pi1 or (p1+pi2)+ random pi which cause a fake peak in the left side of real Xi (see ). Possible toy MC study check if a (p1+pi1)+(p2+pi2) mis-reconstruct as (p1+pi2)+(p2+pi1)
- Related analysis
1) From correlation function:
p+Xi correlation function in isobar and Au+Au 200 GeV:
https://drupal.star.bnl.gov/STAR/meetings/STAR-Collaboration-Meeting-Fall-2023/CF-Parallel-Session/Proton-Xi-correlation-function-Iso
https://drupal.star.bnl.gov/STAR/meetings/STAR-Collaboration-Meeting-Fall-2023/CF-Parallel-Session/Proton-Xi-correlation-function-AuA
Lambda+Lambda :
STAR: https://arxiv.org/abs/1408.4360
ALICE: https://arxiv.org/pdf/1905.07209.pdf
2) ALICE search (no signal, significant below thermal model prediction): https://arxiv.org/pdf/1506.07499.pdf
2, Update on Au+Au 5.2 GeV H3L - Yulou
https://drupal.star.bnl.gov/STAR/system/files/BESII_h3l2b_5p2_yulou%20_240110.pdf
- Remove sys on pi pT
- Sys variation on nHitsFit maybe too tight, will update with new dataset

2023/12/19
Major comments from last week’s PWGC preview (notes: https://drupal.star.bnl.gov/STAR/event/2023/12/15/STAR-PWGC-meeting and recording: /star/u/rksooraj/PAC/PWGCmeeting_recording/20231215.mp4):

1) Single track efficiency uncertainties: Double check 27 GeV (current 2%); update FXT uncertainties when the TPC eff. group releases the value.

2) May be look at minbias event for mean pT and dN/dy since current uncertainties are still appreciable

-> Maybe we can look at 0-40% centrality first.

3) Seems a step from 11.5 - 14.6 GeV in figure 3 and 4 (maybe because 11.5 GeV official embedding / centrality definition are not available yet)

4) 3.9 GeV pT spectra in 10-40% centrality seems steeper (although overall the slopes in FXT energies are consistent within uncertainties)

2023/12/05
1, BES II H3L paper proposal draft slides:
https://drupal.star.bnl.gov/STAR/system/files/paper_proposal_BES_II_H3L_v4.pdf
2, Update on He4L 3.2 GeV spectra - Chenlu
https://drupal.star.bnl.gov/STAR/system/files/Chenlu_JAM_He4L_3p2GeV_20231206.pdf
- When drawing MC/Data comparison for a certain topological variable, loose the corresponding cut on this variable; and label the rapidity/pT and centrality

2023/11/28
1, H3L production at 5.2 GeV - Yulou
https://drupal.star.bnl.gov/STAR/system/files/1701241119464.pdf
- follow the standard analysis method for BES II paper (details see google doc)
2, He4L production at 3 GeV update - Fengyi
- the consistency check with xiujun soon (discrepancy might come from backgrounds reconstruction methods)
- https://drupal.star.bnl.gov/STAR/system/files/Update_for_He4L_Production_in_3GeV_20231127.pdf
3, BES II paper:
- the overleaf link for paper draft and link to paper proposal slides could be found above.
- finalize paper proposal slides and send to group
- comments and suggestions are welcome

2023/11/21
1, Update on H3L/He3 mean pT - Yue Hang
https://drupal.star.bnl.gov/STAR/system/files/hypernuclei20231121.pdf
2, He4L 3 GeV and 3.2 GeV spectra
Yapeng: possibly combine two energies if analysis timelines are close.

2023/11/14
1, Discussion on BES II H3L paper:
- Physics plot: signal plot; pt spectra; mean pt; yields vs energy (if Lambda ready then add H3L/Lambda)
2, Update on isobar H3L extrapolation errors - Dongsheng
https://drupal.star.bnl.gov/STAR/system/files/dsli_231115.pdf
- Still using scaling method to evaluate stat uncertainties (dN/dy = Fraction* dN/dy_measure, stat error = frat*dN/dy_measure_error)
- For uncertainty from the pT shapes, they are all regarded as systematic uncertainties. Trying getting bootstrap distributions from 5 models simultaneously.
3, Update on H3L 5.2 GeV - Yulou
https://drupal.star.bnl.gov/STAR/system/files/Update%20of%20signal_reconstruction_5.2GeV_yulou%20-%2023_11_15.pdf
4, UrQMD simulation of (hyper)nuclei production- Guangsheng
- Check on deuteron yields
- Probably discuss with Chenlu about 3 body coalescence

2023/11/08
1, Update on Au+Au 19.6 GeV S3, H3L/t, <pT> (update on stat and sys uncertainties) - Yue Hang
https://drupal.star.bnl.gov/STAR/system/files/hypernuclei20231108.pdf
2, Update on H3L and Xi with new embedding in isobar collisions - Dongsheng
https://drupal.star.bnl.gov/STAR/system/files/dsli_231108.pdf
3, Update on He4L @ Au+Au 3.2 GeV -Chenlu
https://drupal.star.bnl.gov/STAR/system/files/Chenlu_JAM_He4L_3p2GeV_20231108.pdf

2023/11/01
1, BES II paper discussion - consistency of the analysis method
Proposed paper plots: Google doc link see the last week's email.
Collection of methods:
https://drupal.star.bnl.gov/STAR/system/files/20231101_yingjie_fH3LH4L_systematic_uncertainty_0.pdf
2, Isobar H3L: https://drupal.star.bnl.gov/STAR/system/files/dsli_231101_0.pdf
3, Update on systematic uncertainties of He4L 3 GeV: https://drupal.star.bnl.gov/STAR/system/files/Update_for_He4L_Production_in_3GeV_20231101_1.pdf

2023/10/25
1, BES II paper plan discussion
https://drupal.star.bnl.gov/STAR/system/files/hypernuclei20231024_v2.pdf

- note: excited state of H4L is not included in slides
2, Update on 3.2 GeV He4L - Chenlu
https://drupal.star.bnl.gov/STAR/system/files/Chenlu_JAM_He4L_3p2GeV_20231023.pdf
- rebin topological variable comparison plots
3, Update on H3L 0-80% Au+Au 5.2 GeV - Yulou
https://drupal.star.bnl.gov/STAR/system/files/1698238791942.pdf
- try loose chi2topo and chi2prim_he cuts

2023/10/18
1, BES II paper plan:
- push H3L vs energy to PRL first
- intended plots:
(1) mid-rapidity spectra under each energy 0-10%;
(2) H3L vs energy (with H3L/Lambda ratio as subpanel);
(3) ???;
(4) (supporting material) acceptance plots and signal plots
- other candidate plots: mean pT, S3 vs energy

2023/09/27
1, He4L in Au+Au 3 GeV updates
- Fengyi: https://drupal.star.bnl.gov/STAR/system/files/He4L_Production_20230927.pdf
1) signal extraction -> rebin pt / y to make sure significance of each bin at least 3 sigma
2) systematic uncertainty is too small for -0.4<y<0 ; check if coding for Barlow test is correct
3) dN/dy extrapolation method
- Xiujun: https://drupal.star.bnl.gov/STAR/system/files/20230927xiujun_he4lupdate.pdf
3, Embedding / data comparison of gDca and nHitsFit for proton and He3 in Au+Au 14.6 GeV -yuanjing
https://drupal.star.bnl.gov/STAR/system/files/14p6GeV_embedding_sept28.pdf

2023/09/20
1, Isobar Xi and feed down to Lambda https://drupal.star.bnl.gov/STAR/system/files/Isobar_Xi_dsli_230913.pdf - Dongsheng
2, He4L paper plans - Xiujun, Fengyi
3, 14.6 GeV He3 embedding - yuanjing https://drupal.star.bnl.gov/STAR/system/files/14p6GeV_embedding.pdf

2023/09/13
1, QM news and analysis plans: https://drupal.star.bnl.gov/STAR/system/files/QM_news_and_analysis_plans_0913.pdf
2, JAM+Coal. - Chenlu
https://drupal.star.bnl.gov/STAR/system/files/Chenlu_JAM_He4L_3p2GeV_20230913.pdf
S7 combine different rapidities and carry out simultaneous fit
S9 deltaR and deltaP: draw chi2+/-1 contour (estimate error)
S10 using chi2+/-1 to get/add error bar in this plot
S19 send reference for spin degeneracy factor
3, Searching of LambdaNN - Guangyu
https://drupal.star.bnl.gov/STAR/system/files/groupmeeting_9.13.pdf
- try clean PID cuts and use toy model to study possible effects from mis-PID of t (e.g. He3pi from He3L, dpi from H3L)
- beautify the plots
4, H3L in 5.2 GeV -Yulou https://drupal.star.bnl.gov/STAR/system/files/5p2GeV_yulou_20230913.pdf
- To do: tune cuts in different centrality, fix plots, use correct rapidity convention

2023/08/09
1, FXT Run19 Au+Au 3.2 GeV H3L yields https://drupal.star.bnl.gov/STAR/system/files/h3l_3p2_20230809.pdf -Xiujun
2, Update Au+Au 14.5 GeV H3L and 200 GeV S3 https://drupal.star.bnl.gov/STAR/system/files/lfsupc_meeting_20230814.pdf - Yue Hang
3, First look at FXT Au+Au 5.2 GeV H3L https://drupal.star.bnl.gov/STAR/system/files/1691595121403.pdf - Yulou
4, offline checks:
(1) Yingjie: Check if lambda raw yields are consistent in Run20 and Run19 datasets in the same rapidly/pt ranges at the same collisions energy.
(2) Yuanjing: Collect pt spectra in 4 energies; compare the shapes
(3) Xiujun: Finalize the systematic uncertainties

2023/08/02
1, QM plans: H3L 0-10% dN/dy vs 3.0, 3.2, 3.5, 3.9, 4.5, 7.7, 14.6, 19.6, 27GeV
2, Dongsheng:
- follow with Xianglei, solve the embedding issue
- temporary solution is, get vertex error vs multiplicity from data, and then apply manually in StKFParticleInterface when reading embeddings
3, FXT embedding checks
Yuanjing: https://drupal.star.bnl.gov/STAR/system/files/hypernuclei_aug02.pdf
Yingjie: https://drupal.star.bnl.gov/STAR/system/files/He3_embedding_check.pdf
- embedding might have more than one issue; currently try loose chi2prim He3 cut and chi2topo cut
- to do check: chi2topo vs eta_lab from data

4, Yulou: start 5.2GeV analysis
- considering using TOF (hybrid PID: if TOF match, TOF & TPC, else only TPC.)
https://github.com/star-bnl/star-sw/blob/main/StRoot/StBTofUtil/StV0TofCorrection.cxx

2023/07/26
1, Lambda production in isobar - Dongsheng
https://drupal.star.bnl.gov/STAR/system/files/dsli_0726_isobar_lambda.pdf
- use fine pt/y bins to check data and MC comparison
- Xi correction using published Au+Au 200 GeV data
2, Update of He4L in 3 GeV - Xiujun
https://drupal.star.bnl.gov/STAR/system/files/0726.pdf
- check with fengyi and use same cuts and binning, cross check raw and corrected pt spectra
3, FXT energy scan: xiujun update 3.2 GeV soon, yingjie/yuanjing try same topo cuts as cross check
4, after meeting: https://drupal.star.bnl.gov/STAR/system/files/20230701_GYZheng_Cuts_Tuning.pdf

2023/07/19
1, PHQMD calculation https://drupal.star.bnl.gov/STAR/system/files/yingjie_3GeV_H3LH4L_phqmd.pdf - yingjie
2, lambda in isobar https://drupal.star.bnl.gov/STAR/system/files/dsli_isobar_lambda.pdf - dongsheng

2023/07/05
1, Fitting functions used to extrapolate dN/dy yields - Yue Hang
https://drupal.star.bnl.gov/STAR/system/files/hypernuclei_meeting_2023004.pdf
- Currently maybe best thing we can do is show both pT/A>0.4 and pT/A>0 for S3 extrapolation
2, Plans on isobar Hypernuclei/light nuclei paper https://drupal.star.bnl.gov/STAR/system/files/isobar_plans.pdf
- follow discussion with theory paper author about H3L/Lambda (and whether they can calculate for isobar in the future)
3, Update on isobar Hypernuclei and Lambda: https://drupal.star.bnl.gov/STAR/system/files/dsli_230705.pdf
- further tune H3L cuts (maybe loose cuts), and store rotation backgrounds normalization plots as reference
- finalize lambda analysis (Q: why high pt efficiency is decreasing)

2023/06/21
1, H3L - yuanjing https://drupal.star.bnl.gov/STAR/system/files/H3L_3p9_June18.pdf
2, Any plans on last week's #5
BESII_2shypernuclei_search_plans (anyone can edit, suggest check in the desktop powerpoint since online symbols will not shown correctly)
3, Any plans on 4.8 GeV

2023/06/14
1, He4L from Fengyi: https://drupal.star.bnl.gov/STAR/system/files/Check_Chi2primary_fppi_FengyiZhao_20230614.pdf
see also PWG slides with some plots updated: https://drupal.star.bnl.gov/STAR/system/files/He4L_production_3GeVAuAu_FengyiZhao_20230619.pdf
- Signal significance under each fine bins should try to keep >3 (need re-binning)
- Maybe try to find a set of cuts to ensure the combinatorial backgrounds smoother (e.g. a tighter chi2prim_pip cuts)
- in slide 9 both H4L and He4L are not correct branching ratio (should correct it to ensure it is a fair comparison)
2, 3.5 GeV H3L from Yingjie: https://drupal.star.bnl.gov/STAR/system/files/yingjie_fxt3p5GeV_H3L_2body.pdf
- Try to store Run2020/2019 datasets separately for future comparison of two datasets
3, 3.9GeV H3L from Yuanjing: https://drupal.star.bnl.gov/STAR/system/files/H3L_3p9_June14.pdf
- check the statistic uncertainties
- why still some structure in efficiency vs eta_lab
4, From Yue Hang: embedding strategy; physics plots : https://drupal.star.bnl.gov/STAR/system/files/hypernuclei_s3_s4.pdf
5, From Xin, need contributions to lead the search of double-strangeness hypernuclei and cascade hypernuclei (maybe we can use all BES II and 200 GeV datasets)

2023/06/07
1, He4L from Xiujun https://drupal.star.bnl.gov/STAR/system/files/He4Lana0607.pdf
- pT spectra weight (literation method)
- systematic uncertainty estimation. If using random combination of different cuts, suggest to draw a histogram as a function of lifetime, e.g. https://drupal.star.bnl.gov/STAR/system/files/anannote_v4.pdf Fig 44
- Xiujun and Fengyi listed the detailed cuts used in the analysis (including PID and track QA cuts)
2, open discussion:
1) de-efficiency of lambda/H3L around eta_lab ~ -1 to -1.5, see: https://drupal.star.bnl.gov/STAR/system/files/softhadron_June05.pdf page 12-13.
(short answer is due to dEdxError cuts,
in StRoot/StKFParticleAnalysisMaker/StKFParticleInterface.cxx ProcessEvent(...):
if ( gTrack->probPidTraits().dEdxErrorFit() < 0.04 || gTrack->probPidTraits().dEdxErrorFit() > 0.12 ) continue;)
- the distribution from He3 embedding
https://drupal.star.bnl.gov/STAR/system/files/He3_dedxerror_embedding_20230607.png
- check dEdxError from Data
2) thermal model

2023/05/31
1, He3 and He4 PID- Yulou https://drupal.star.bnl.gov/STAR/system/files/He3He4PID_yulou2023_5_31%20.pdf
- Q&C: The band around dEdx ~ 30-40 keV/cm, from merged proton tracks? how to remove those tracks?

2, He4L production in 3 GeV - Fengyi https://drupal.star.bnl.gov/STAR/system/files/He4L_production_20230531.pdf
- C: Check He3Lambda contribution to the signals. check different chi2prim_ppi cuts vs Dalitz plots and He4L mass width
- C: Suggest to directly compare He4L and H4L pT spectra
- Q: Why He4L dN/dy is different from H4L?
- A: Triton and He3 distribution is also different.
- C: Suggest to also draw triton and He3 dn/dy distribution in the He4L plots (maybe scaled)

3, BES II analysis organization:
Xiujun -> 3.2 GeV H3L,H4L
Yingjie -> 3.5 GeV H3L,H4L
Yuanjing -> 3.9, 4.5 GeV H3L,H4L
Yulou -> 5.5 GeV

4, Any plans on H3L binding energy measurements using COL datasets? (current no one work on this)

2023/05/14 yuanjing H3L 2 body in FXT 3.9 GeV
https://drupal.star.bnl.gov/STAR/system/files/H3L2b_FXT3p9GeV.pdf

----------------------------
Some technique information:
1, PID information:
FXT Run2020 3.9 GeV PID: /star/u/jiyj/pwg/Hypertron/data/7p3_2020_2body/StRoot/StKFParticleAnalysisMaker/StKFParticleInterface.cxx GetPID(...) , note that the input dEdxPuLL to this function should not use absolute value.
FXT Run2020 4.5 GeV PID: /star/u/jiyj/pwg/Hypertron/data/9p8_2b/StRoot/StKFParticleAnalysisMaker/StKFParticleInterface.cxx

2, Where we should put our data points:
https://www.star.bnl.gov/protected/lfspectra/marr/Analysis/PlaceDataPoints.pdf
https://github.com/JiYuanjing/Hypernuclei_BES_II/blob/main/H3L2b_3.9/drawData_00_10.C TGraphErrors* ptshift(TF1* fit, TH1* h)

3, Standarded procedure for spectra analysis:
1) Run QA, Centrality definition etc.
https://drupal.star.bnl.gov/STAR/blog/gnigmat/centrality-definition-star
2) PID recalibration
- Since BES II datasets suffer some issue with offset of PID, so recalibration is needed
- Read dEdx, dEdxPuLL information using the particle samples selected by TOF. Fit the distribution in fine momentum bins and extract the outer line of 3sigma/2sigma bands
- As a cross check, double check whether the data has applied the correct PID cuts
3) Signal reconstruction
4) Efficiency correction
- Embedding request can be submitted right after first presentation in PWG
- Embedding QA
- pT or rapidity weighting
- (reconstructed)/ (total MC)
5) Differential spectra e.g. d^2N/(2pi pT dpT dy ) vs pT in different rapidity(y) and centrality bins
6) dN/dy extrapolation

----------------------------
Arrangements:

Energy	Particle	decay channel	name/status
FXT 3.2 GeV	H3L	H3L->He3pi H3L->dppi	Xiujun Yuanjing
	H4L		Xiujun
	Lambda
FXT 3.5 GeV	H3L H4L		Yingjie
FXT 3.9 GeV	H3L	H3L->He3pi H3L->dppi	Yuanjing
	H4L
	Lambda
FXT 4.5 GeV			Yuanjing

H3L 3body Dalitz plots:
https://drupal.star.bnl.gov/STAR/system/files/theorydalitz.pdf

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