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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
2
Terminology
A.Capella et al., Phys.Rep. 236,225(1994)
E.Andronov & A.Seryakov LUHEP SPbSU
3
Terminology
In the case of a linear correlation function slope parameter
E.Andronov & A.Seryakov LUHEP SPbSU
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
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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
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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
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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
8
Short range correlation
E.Andronov & A.Seryakov LUHEP SPbSU
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
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
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
12
Long range correlation
E.Andronov & A.Seryakov LUHEP SPbSU
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
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
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
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
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
18
Backup
E.Andronov & A.Seryakov LUHEP SPbSU
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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
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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