![Page 1: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/1.jpg)
Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c
Evgeny Andronov and Andrey [email protected]
Katowice29/01/2015
E.Andronov & A.Seryakov LUHEP SPbSU
St. Petersburg State UniversityLaboratory of Ultra-High Energy
Physics
![Page 2: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/2.jpg)
2
Terminology
A.Capella et al., Phys.Rep. 236,225(1994)
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 3: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/3.jpg)
3
Terminology
In the case of a linear correlation function slope parameter
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 4: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/4.jpg)
4
Terminology
Possible types• - the correlation between charged particle multiplicities in backward (B) and
forward (F) rapidity windows
• - the correlation between the event mean transverse momentum in B and multiplicity in F
• -the correlation between the event mean transverse momenta in B and F
• - the correlation between the event net charges in B and F
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 5: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/5.jpg)
5
Analysis technique: MC
DataEvent cuts: 1. T22. WFA 1.5 μs 3. ZCharge (by Emil) 4. BPD 5. Fitted Vertex 6. Fit Quality 7. Number of good vertex tracks >
2 8. Z coordinate +/- 5cm9. Centrality 0-20%
Track cuts: 1. Vertex track status and has
track2. Impact parameter X < 4cm Y <
2cm3. VTPC clusters > 14 or GapTPC >
44. All TPC clusters > 145. Pt < 1.5 GeV/c6. Acceptance map
MC Data (EPOS 1.99 by Emil)SimEvents
1. Centrality 0-20% 1. Pt < 1.5 GeV/c2. Acceptance map
RecEvents
1. Number of good vertex tracks > 2
2. Z coordinate +/- 5cm3. Centrality 0-20%
1. Vertex track status and has track
2. Impact parameter X < 4cm Y < 2cm
3. VTPC clusters > 14 or GapTPC > 4
4. All TPC clusters > 145. Pt < 1.5 GeV/c6. Acceptance map
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 6: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/6.jpg)
6
Analysis technique: MC correction
E.Andronov & A.Seryakov LUHEP SPbSU
10d THSparse: multiplicity Forward+ Forward- Backward+Backward- Pt Forward+ Forward- Backward+Backward-NetCharge Forward Backward
Bin_raw_corrected = Bin_raw*Bin_sim/Bin_rec
if Bin_sim or Bin_rec doesn’t exist
Bin_raw_corrected = Bin_raw
![Page 7: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/7.jpg)
7
Analysis technique: MC correction
E.Andronov & A.Seryakov LUHEP SPbSU
10d THSparse: multiplicity Forward+ Forward- Backward+Backward- Pt Forward+ Forward- Backward+Backward-NetCharge Forward Backward
Bin_raw_corrected = Bin_raw*Bin_sim/Bin_rec
if Bin_sim or Bin_rec doesn’t exist
Bin_raw_corrected = Bin_raw
𝑁𝑏𝑖𝑛𝑠𝑐𝑜𝑟𝑟𝑒𝑐𝑡𝑒𝑑𝑁𝑏𝑖𝑛𝑠
𝐹𝑜𝑟𝑤𝑎𝑟𝑑𝑤𝑖𝑛𝑑𝑜𝑤𝑐𝑒𝑛𝑡𝑒𝑟𝐵𝑎𝑐𝑘𝑤𝑎
𝑟𝑑𝑤𝑖𝑛𝑑
𝑜𝑤𝑐𝑒𝑛𝑡𝑒𝑟
short
range
long range
![Page 8: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/8.jpg)
8
Short range correlation
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 9: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/9.jpg)
9
Short range correlation: multiplicity
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
![Page 10: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/10.jpg)
10
Short range correlation: Pt-multiplicity
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
![Page 11: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/11.jpg)
11
Short range correlation: Pt
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
![Page 12: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/12.jpg)
12
Long range correlation
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 13: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/13.jpg)
13
Long range correlation: multiplicity
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
![Page 14: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/14.jpg)
14
Long range correlation: Pt-multiplicity
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
![Page 15: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/15.jpg)
15
Long range correlation: Pt
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
![Page 16: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/16.jpg)
16
Long range correlation: Pt
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
Long range
![Page 17: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/17.jpg)
17
Conclusions, results and plans …
E.Andronov & A.Seryakov LUHEP SPbSU
• EPOS 1.99 doesn’t describe resonance decays in midrapidity
• Available statistic doesn’t allow to find string fusion (or another collective effects) in BeBe 150Gev/c. Probably they don’t exist here.
• The long-range pt-N behavior is an open question(Why is it below zero?)
Plans:• cut • modernization of the correction procedure• systematic errors
Pt-N
Real data
EPOS
Pt-Pt
Pt-N
![Page 18: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/18.jpg)
18
Backup
E.Andronov & A.Seryakov LUHEP SPbSU
![Page 19: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/19.jpg)
19
Net charge correlation
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
EPOS
Reconstructed data
Simulated data
Simulated without accept.
Real data
Raw data
Corrected data
Long range
Short range
![Page 20: Current status of Long-Range correlation analysis in Be+Be at 150 GeV/c Evgeny Andronov and Andrey Seryakov seryakov@yahoo.com Katowice 29/01/2015 E.Andronov](https://reader035.vdocuments.us/reader035/viewer/2022062721/56649f1f5503460f94c373ea/html5/thumbnails/20.jpg)
20
Long range correlation: Pt
E.Andronov & A.Seryakov LUHEP SPbSU
𝑏𝑐𝑜𝑟𝑟𝑟𝑒𝑙 =
⟨𝐹 ⟩⟨𝐵 ⟩
⟨ 𝐵𝐹 ⟩− ⟨𝐵 ⟩ ⟨𝐹 ⟩⟨𝐹2 ⟩− ⟨ 𝐹 ⟩2
Centrality 0-20%
all charges
negative
positive
negative from forward |positive from backward
positive from forward |negative from backward