two-particle correlation in e collisions at 91.2 gev with ...anthony badea (mit) acknowledgement...
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Anthony Badea (MIT)
Two-Particle Correlation in e+e- Collisions at 91.2 GeV with ALEPH Archived Data
1Two-Particle Correlation in e+e- with ALEPH archived data
Anthony Badea, Austin Baty, Gian Michele Innocenti, Yen-Jie Lee,Christopher McGinn, Michael Peters, Jesse Thaler
Massachusetts Institute of Technology
Paoti Chang, Tzu-An ShengNational Taiwan University
Marcello Maggi Universita degli Studi di Bari
ICHEP 2018, Seoul, South Korea04-11 July, 2018
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Anthony Badea (MIT)
Motivation
2Two-Particle Correlation in e+e- with ALEPH archived data
pp pPb PbPb
?e+e-
AuAu
e+e-
pp
Charged Hadron dN/dη• Ridge observed in small systems, possible explanations:
• Initial state effect (CGC)• Final state effect due to mini-QGP• …
• Similarity between e+e-, pp and AA• Event multiplicity per participant• dN/dη(y)
• Study of high multiplicity event with well-defined initial condition:• No complication from hadron structure• No multi-parton interaction
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Anthony Badea (MIT)
SuperconductingMagnet (1.5T)
Hadron Calorimeter
Time ProjectionChamber
Muon Chamber
Inner Tracking Chamber
ElectromagneticCalorimeter
The ALEPH Detector
3Two-Particle Correlation in e+e- with ALEPH archived data
• LEP1 e+e- data at Z pole (91 GeV)• Charged particles multiplicity:
• 𝑵𝑻𝒓𝒌𝑶𝒇𝒇𝒍𝒊𝒏𝒆: pT>0.2 GeV and |η|<1.74
• Jets are reconstructed by tracks + calorimeters
<10
10-20
20-30
>30
>35
Charged Particle Multiplicity
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Anthony Badea (MIT)
Event Shape: Thrust
4Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Thrust Axis 𝑛,
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Anthony Badea (MIT)
Unfolded Thrust Distribution
5Two-Particle Correlation in e+e- with ALEPH archived data
Typical e+e- annihilation events are more pencil-like
Pencil-like: T~1
Spherical: T~0.5
Thrust (T)
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Anthony Badea (MIT)
High Multiplicity Event in e+e- Collisions (1)
6Two-Particle Correlation in e+e- with ALEPH archived data
44 TracksT=0.57
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Anthony Badea (MIT)
High Multiplicity Event in e+e- Collisions (2)
7Two-Particle Correlation in e+e- with ALEPH archived data
39 TracksT=0.98
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Anthony Badea (MIT)
Beam Axis Analysis
8Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Identical measurement as performed in pp, pA and AA collisions in various experiments
Soft radiation
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Anthony Badea (MIT)
Beam Axis Analysis
9Two-Particle Correlation in e+e- with ALEPH archived data
Pseuodorapidity (η) and azimuthal angle (Φ) are calculated with respect to the beam pipe
e+ e-
Φη
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Anthony Badea (MIT)
Beam Axis Analysis
10Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Φ1Δη=η1-η2
• Search for ridge signal with beam axis: enhance number of charged particle pairs with large Δη gap and similar Φ (small ΔΦ=Φ1-Φ2)
• Ex: Sensitive to “pressure driven expansion” of the medium in the direction perpendicular to the beam axis
Φ2
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Anthony Badea (MIT)
Beam Axis Analysis Result
11Two-Particle Correlation in e+e- with ALEPH archived data
Low Multiplicity4≤𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞<10
High Multiplicity𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞≥35
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Anthony Badea (MIT)
Beam Axis Analysis Result
12Two-Particle Correlation in e+e- with ALEPH archived data
Beautiful jet-like structure at (Δη,ΔΦ) ~ (0,0)
Low Multiplicity4≤𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞<10
High Multiplicity𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞≥35
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Anthony Badea (MIT)
Beam Axis Analysis Result
13Two-Particle Correlation in e+e- with ALEPH archived data
Low Multiplicity4≤𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞<10
High Multiplicity𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞≥35
No ridge structure observed at small ΔΦ and large Δη
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Anthony Badea (MIT)
Beam Axis Analysis Result
14Two-Particle Correlation in e+e- with ALEPH archived data
PYTHIA6 (curve)Data (dots)
1.6<|Δη|<3.0(Long range)
|Δη|<1.6 (Jet Region)
Low Multiplicity4≤𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞<10
Excellent agreement between PYTHIA6 and Data
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Anthony Badea (MIT)
Beam Axis Analysis Result
15Two-Particle Correlation in e+e- with ALEPH archived data
High multiplicity𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞>35
|Δη|<1.6 (Jet Region)
1.6<|Δη|<3.0(Long range)
• Good agreement between PYTHIA6 and Data• No near-side ridge observed
PYTHIA6 (curve)Data (dots)
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Anthony Badea (MIT)
ΔΦ Projection vs. Event Multiplicity
16Two-Particle Correlation in e+e- with ALEPH archived data
PYTHIA6 (curve) vs. Data (dot) [Beam axis analysis]
|Δη|<1.6 (Jet Region)
1.6<|Δη|<3.0(Long range)
4≤N<10 10≤N<20 20≤N<30 N≥30 N≥35
• Good agreement between PYTHIA6 and ALEPH Data for N<30• No near-side peak (ridge) is found at small ΔΦ in long range correlation
• Some difference observed at high multiplicity N ≥35
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Anthony Badea (MIT)
Beam Axis Analysis
17Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
No ridge signal is found in beam axis analysis, which is sensitive to perturbative physics (+ parton shower)
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Anthony Badea (MIT)
Thrust Axis Analysis
18Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Thrust axis analysis to follow the “direction of color string”
Thrust Axis 𝑛,
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Anthony Badea (MIT)
Thrust Axis Analysis
19Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Thrust Axis 𝑛,Φ
η
Pseuodorapidity (η) and azimuthal angle (Φ) are calculated with respect to the Thrust Axis
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Anthony Badea (MIT)
Thrust Axis Analysis
20Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Thrust Axis 𝑛,Φ1
Δη=η1-η2
Φ2
Search for ridge signal with thrust axis: enhance number of charged particle pairs with large Δη gap and similar Φ (small ΔΦ=Φ1-Φ2)
Pseuodorapidity (η) and azimuthal angle (Φ) are calculated with respect to the Thrust Axis
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Anthony Badea (MIT)
Correlation Function with Thrust Axis
21Two-Particle Correlation in e+e- with ALEPH archived data
ALEPH e+e-
10≤𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞<20 Thrust axisCMS ppInclusive Beam axis
Correlation function with Thrust Axis as reference is much more similar to the beam axis result in pp collisions (with many caveats / differences)
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Anthony Badea (MIT)
Correlation Function with Thrust Axis
22Two-Particle Correlation in e+e- with ALEPH archived data
ALEPH e+e-
10≤𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞<20 Thrust axis
Narrower away side peak in high multiplicity events
ALEPH e+e-
𝐍𝐓𝐫𝐤𝐎𝐟𝐟𝐥𝐢𝐧𝐞≥35 Thrust axis
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Anthony Badea (MIT)
LEP1 Data vs PYTHIA6 N≥30
23Two-Particle Correlation in e+e- with ALEPH archived data
Projection
• Hint of near-side peak in data• Consistent with PYTHIA6 without final state effects• Contribution from multi-jet correlation
• PYTHIA6 reference limited by archive MC statistics
(ZYAM subtracted)
1.6<|Δη|<3.0(Long range)
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Anthony Badea (MIT)
LEP1 Data vs PYTHIA6 N≥35
24Two-Particle Correlation in e+e- with ALEPH archived data
Projection
• Hint of near-side peak in data• Consistent with PYTHIA6 without final state effects• Contribution from multi-jet correlation
• PYTHIA6 reference limited by archive MC statistics
(ZYAM subtracted)
1.6<|Δη|<3.0(Long range)
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Anthony Badea (MIT)
Thrust Axis Analysis
25Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
• “Perturbative QCD physics” still comes in the Thrust axis analysis (Jets)• One possibility to suppress jet component is to apply a |η| selection
Thrust Axis 𝑛,
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Anthony Badea (MIT)
Thrust Axis Analysis with Jet Veto
26Two-Particle Correlation in e+e- with ALEPH archived data
e+ e-
Thrust Axis 𝑛,
• Remove particles at large η(in the leading and subleadingjet) by requiring |η| < 1.6
• Enhance the contribution of soft radiation
soft radiation
• “Perturbative QCD physics” still comes in the Thrust axis analysis (Jets)• One possibility to suppress jet component is to apply a |η| selection
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Anthony Badea (MIT)
LEP1 Data vs LEP1 MC N≥35
27Two-Particle Correlation in e+e- with ALEPH archived data
Projection
• Hint of near-side peak in data• Consistent with PYTHIA6 w/o final state effects• Contribution from multi-jet correlation
• PYTHIA6 reference limited by archive MC statistics
1.6<|Δη|<3.0(Long range)
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Anthony Badea (MIT)
LEP1 Data vs LEP1 MC N≥35
28Two-Particle Correlation in e+e- with ALEPH archived data
Projection
|η| < 1.6• Hint of near-side peak in data
• Consistent with PYTHIA6 w/o final state effects• Contribution from multi-jet correlation
• PYTHIA6 reference limited by archive MC statistics
1.6<|Δη|<3.0(Long range)
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Anthony Badea (MIT)
Summary
29Two-Particle Correlation in e+e- with ALEPH archived data
• The first two-particle correlation analysis in e+e- performed in bins of event multiplicity up to N = 35 - 55• No significant ridge signal is observed in beam axis analysis
• Thrust axis and jet region veto are employed to enhance the signal from soft radiations• No significant difference between ALEPH LEP1 data and
PYTHIA6 observed
• No evidence of the final state effect in the probed event multiplicity ranges: • An important reference of the ridge signal observed in pp,
pA, dA and AA collisions
• LEP2 Data analysis (up to 𝑠� ~208 GeV) ongoing… stay tuned!
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Anthony Badea (MIT)
Acknowledgement
30Two-Particle Correlation in e+e- with ALEPH archived data
We would like to thank Roberto Tenchini and Guenther Dissertori from the ALEPH collaboration for the useful comments and suggestions on the use of ALEPH archived data.
We would like to thank Wei Li, Maxime Guilbaud, Wit Busza and Yang-Ting Chen for the useful discussions on the analysis.
The MIT group's work was supported by US DOE-NP
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Anthony Badea (MIT)
Particle Production
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Anthony Badea (MIT)
Event Selection
32Two-Particle Correlation in e+e- with ALEPH archived data
• Track Selection:• Particle Flow Candidate 0, 1, 2• Number of TPC hits for a charged tracks >= 4• |d0| < 2 cm• |z0|< 10 cm• |cosθ|<0.94• pT> 0.2 GeV (transverse momentum with respect to beam axis)• NTPC >=4• x2/ndf < 1000.
• Neutral Hadron Selection:• Particle Flow Candidate 4, 5 (ECAL / HCAL object)• E> 0.4 GeV• |cosθ|<0.98
• Event Selection:• Number of good charged particles >= 5 (including charged hadrons and
leptons)• Number of good ch+neu. Particles >= 13• Echarged > 15 GeV• |cos(θsphericity)|<0.82
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Anthony Badea (MIT)
Uncorrected Thrust Distributions
33Two-Particle Correlation in e+e- with ALEPH archived data
N: # of charged particles with pT>0.2 GeV and |η|<1.74High multiplicity events are more spherical
InclusiveN N<10 10≤N<20
20≤N<30 N≥30 N≥35
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Anthony Badea (MIT)
Uncorrected Thrust distributions in different N intervals
34Two-Particle Correlation in e+e- with ALEPH archived data
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Anthony Badea (MIT)
Charged Particle Multiplicity
35Two-Particle Correlation in e+e- with ALEPH archived data
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Anthony Badea (MIT)
Jet multiplicity
36Two-Particle Correlation in e+e- with ALEPH archived data