Study of jet shapes in Monte-Carlo generator JEWEL at RHIC Bc. - - PowerPoint PPT Presentation
Study of jet shapes in Monte-Carlo generator JEWEL at RHIC Bc. Veronika Agafonova Supervisor: RNDr. Jana Biel c kov a, Ph.D. Czech Technical University in Prague Faculty of Nuclear Sciences and Physical Engineering Experimental
Supervisor: RNDr. Jana Bielˇ c´ ıkov´ a, Ph.D.
Czech Technical University in Prague Faculty of Nuclear Sciences and Physical Engineering Experimental Nuclear and Particle Physics
January, 17, 2019
Study of jet shapes in JEWEL at RHIC January, 17, 2019 1 / 29
1
STAR
2
Jet shapes
3
Anti-kT algorithm
4
JEWEL
5
Results
Study of jet shapes in JEWEL at RHIC January, 17, 2019 2 / 29
Figure : RHIC complex. 1 - Electron Beam Ion Source (EBIS), 2 - Linear Accelerator (Linac), 3 - Booster Synchrotron, 4 - Alternating Gradient Synchrotron, 5 - AGS-to-RHIC Line, 6 - RHIC [1].
[1] https://www.bnl.gov/rhic/
Study of jet shapes in JEWEL at RHIC January, 17, 2019 3 / 29
The Solenoidal Tracker at RHIC
Figure : STAR detector system [2].
[2] https://www.star.bnl.gov/
Study of jet shapes in JEWEL at RHIC January, 17, 2019 4 / 29
Jet
A narrow cone of hadrons and other particles produced by the hadronization of a quark or gluon in particle physics or heavy-ion experiment
Study of jet shapes in JEWEL at RHIC January, 17, 2019 5 / 29
In order to understand the mechanisms of energy loss of partons in the medium and the properties of the medium itself, one should measure the modifications of the jet yield and fragmentation relative to p+p collisions. For this aim different jet shape observables are used: Radial moment g Momentum dispersion pTD LeSub Mass etc.
Study of jet shapes in JEWEL at RHIC January, 17, 2019 6 / 29
The angularity g measures the radial energy profile of the jet. The radial moment is given by the equation: g = ∑
i∈jet
pi
T
pT,jet |∆Ri,jet| (1) where pi
T represents the momentum of the ith constituent and ∆Ri,jet is
the distance in η ×φ plane between the constituent i and the jet axis [4].
[4] S. Acharya et al. Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76TeV, JHEP 10:139, 2018
Study of jet shapes in JEWEL at RHIC January, 17, 2019 7 / 29
The momentum dispersion pTD measures the second moment of the constituent pT distribution in the jet. It is defined as follows [4]: pTD =
T,i
∑i∈jet pT,i . (2)
[4] S. Acharya et al. Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76TeV, JHEP 10:139, 2018
Study of jet shapes in JEWEL at RHIC January, 17, 2019 8 / 29
The difference of the leading track pT ( plead
T,track) and sub-leading track pT
(psublead
T,track ) or LeSub is defined as [4]:
LeSub = plead
T,track −psublead T,track .
(3)
Figure : An example of jet pair in Pb+Pb collision at √sNN = 2.76 TeV [5].
[5] S. Salur, A Brief Review of CMS Jet Measurements, J. Phys. Conf. Ser. 589(1):012017, 2015
Study of jet shapes in JEWEL at RHIC January, 17, 2019 9 / 29
ALICE results
0.05 0.1
g
10 20 30
g /d
jets
N d
jets
N 1/
= 2.76 TeV
NN
s Pb − 10% Pb − = 0.2 R charged jets,
T
k Anti- c 60 GeV/ ≤
ch T,jet
p ≤ 40 ALICE
ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub) ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub) ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub)
0.4 0.6 0.8 1
D
T
p
2 4 6
D
T
p /d
jets
N d
jets
N 1/
ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub) ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub) ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub)
10 20 30
) c (GeV/ LeSub
0.05 0.1 0.15
/GeV) c ( LeSub /d
jets
N d
jets
N 1/
ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub) ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub) ALICE data JEWEL no recoils JEWEL recoils (deriv.sub) JEWEL recoils (const.sub)
Figure : Jet shape distributions in 0–10% central Pb–Pb collisions at √sNN = 2.76 TeV for R = 0.2 in range of jet pch
T,jet of 40–60 GeV/c compared
to JEWEL with and without recoils with different subtraction methods. The colored boxes represent the experimental uncertainty on the jet shapes [4].
[4] S. Acharya et al. Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN = 2.76TeV, JHEP 10:139, 2018
Study of jet shapes in JEWEL at RHIC January, 17, 2019 10 / 29
Cluster type jet finding algorithm − → based on successive pair-wise recombination of particles. The hard particle is found first. The algorithm:
⋄ Find the minimum distances via dij = min(k−2
ti ,k−2 tj )
∆2
ij
R2 , (4) diB = k−2
ti ,
(5) where ∆2
ij = (yi −yj)2 +(φi +φj)2.
Study of jet shapes in JEWEL at RHIC January, 17, 2019 11 / 29
Cluster type jet finding algorithm − → based on successive pair-wise recombination of particles. The hard particle is found first. The algorithm:
⋄ Find the minimum distances via dij = min(k−2
ti ,k−2 tj )
∆2
ij
R2 , (4) diB = k−2
ti ,
(5) where ∆2
ij = (yi −yj)2 +(φi +φj)2.
⋄ Find the minimum distance dmin between all the dij and diB.
Study of jet shapes in JEWEL at RHIC January, 17, 2019 11 / 29
Cluster type jet finding algorithm − → based on successive pair-wise recombination of particles. The hard particle is found first. The algorithm:
⋄ Find the minimum distances via dij = min(k−2
ti ,k−2 tj )
∆2
ij
R2 , (4) diB = k−2
ti ,
(5) where ∆2
ij = (yi −yj)2 +(φi +φj)2.
⋄ Find the minimum distance dmin between all the dij and diB. ⋄ Repeat the first two steps until no particles left.
[3] M. Cacciari, G. P. Salam, Dispelling the N3 myth for the kt jet-finder. Phys. Lett.,B 641:57-61, 2006
Study of jet shapes in JEWEL at RHIC January, 17, 2019 11 / 29
Jet Evolution With Energy Loss
Name of parameter Name in JEWEL Value Parton Distribution Function set PDFSET 10100 Number of events NEVENT 100000 Mass number of Au nucleus MASS 197 The CMS energy of the colliding system SQRTS, [GeV] 200 Minimum pT in matrix element PTMIN, [GeV] 3 Maximum pT in matrix element PTMAX, [GeV]
The switch of keeping recoils KEEPRECOLIS T F The rapidity range ETAMAX 2.5
Table : Parameters of JEWEL vacuum simulation for central and peripheral ”recoils on/off” collisions [6].
[6] K. C. Zapp, JEWEL 2.0.0: Directions for use. Eur. Phys. J., C74(2):2762, 2014
Study of jet shapes in JEWEL at RHIC January, 17, 2019 12 / 29
Name of parameter Name in JEWEL Value The initial (mean) temperature TI, [GeV] 0.28 The initial time τi TAUI, [fm] 0.6 An integer mass number of colliding nuclei A 197 The lower end of centrality range CENTRMIN, [%] 60 The upper end of centrality range CENTRMAX, [%] 10 80 The nucleus-nucleus cross-section SIGMANN, [fm2] 4.2
Table : Parameters of JEWEL simulation with medium for central and peripheral ”recoils on/off” collisions [6].
[6] K. C. Zapp, JEWEL 2.0.0: Directions for use. Eur. Phys. J., C74(2):2762, 2014
Study of jet shapes in JEWEL at RHIC January, 17, 2019 13 / 29
Angularity for Au+Au central collisions at √sNN = 200 GeV
0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14 16 18
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 20 GeV/c
T,jet
10 < p 0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14 16
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 20 GeV/c
T,jet
10 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 14 / 29
Angularity for Au+Au central collisions at √sNN = 200 GeV
0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14 16 18
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 30 GeV/c
T,jet
20 < p 0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 30 GeV/c
T,jet
20 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 15 / 29
Central recoils on Au+Au collisions simulated for medium model at √sNN = 200 GeV
0.05 0.1 0.15 0.2 0.25 0.3 Angularity, g 5 10 15 20 25 30 35 Number of constituents 2000 4000 6000 8000 10000 12000 14000 0-10% JEWEL medium < 20 GeV/c
T,jet
10 < p R = 0.2
0.05 0.1 0.15 0.2 0.25 0.3 Angularity, g 5 10 15 20 25 30 35 Number of constituents 2000 4000 6000 8000 10000 12000 14000 0-10% JEWEL medium < 20 GeV/c
T,jet
10 < p R = 0.4 0.05 0.1 0.15 0.2 0.25 0.3 Angularity, g 5 10 15 20 25 30 35 Number of constituents 200 400 600 800 1000 1200 0-10% JEWEL medium < 30 GeV/c
T,jet
20 < p R = 0.2
0.05 0.1 0.15 0.2 0.25 0.3 Angularity, g 5 10 15 20 25 30 35 Number of constituents 100 200 300 400 500 600 700 0-10% JEWEL medium < 30 GeV/c
T,jet
20 < p R = 0.4
Study of jet shapes in JEWEL at RHIC January, 17, 2019 16 / 29
Central Au+Au collisions at √sNN = 200 GeV
5 10 15 20 25 30 35 Number of constituents 50 100 150 200 250 300 350 400
3
10 × Entries Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 20 GeV/c
T,jet
10 < p 5 10 15 20 25 30 35 Number of constituents 50 100 150 200 250 300 350 400
3
10 × Entries Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 20 GeV/c
T,jet
10 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 17 / 29
The momentum dispersion for central Au+Au collisions at √sNN = 200 GeV
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 20 GeV/c
T,jet
10 < p 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 20 GeV/c
T,jet
10 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 18 / 29
The momentum dispersion for central Au+Au collisions at √sNN = 200 GeV
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 30 GeV/c
T,jet
20 < p 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 30 GeV/c
T,jet
20 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 19 / 29
LeSub for central Au+Au collisions at √sNN = 200 GeV
5 10 15 20 25 30
] c , [GeV/ LeSub
4 −
10
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 20 GeV/c
T,jet
10 < p
5 10 15 20 25 30
] c , [GeV/ LeSub
4 −
10
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 20 GeV/c
T,jet
10 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 20 / 29
LeSub for central Au+Au collisions at √sNN = 200 GeV
5 10 15 20 25 30
] c , [GeV/ LeSub
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.2 < 30 GeV/c
T,jet
20 < p
5 10 15 20 25 30
] c , [GeV/ LeSub
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 0-10% Au+Au Anti-kT charged jets, R = 0.4 < 30 GeV/c
T,jet
20 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 21 / 29
The practical application of the anti-kT jet finding algorithm and the chosen jet shape observables on the simulated data with/without nuclear medium model at particle level in the MC generator JEWEL at √sNN = 200 GeV. Discussion of the obtained results for jet shapes as a function of the transverse momentum of jet and the centrality in vacuum and nuclear medium. Future goals: To perform the background subtraction similarly to the ALICE experiment. To apply methods on experimental data from STAR. To compare the obtained results with the simulation made in JEWEL and the results from the LHC collaborations.
Study of jet shapes in JEWEL at RHIC January, 17, 2019 22 / 29
Study of jet shapes in JEWEL at RHIC January, 17, 2019 23 / 29
Angularity for Au+Au peripheral collisions at √sNN = 200 GeV
0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14 16 18
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au Anti-kT charged jets, R = 0.2 < 20 GeV/c
T,jet
10 < p 0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14 16
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au Anti-kT charged jets, R = 0.4 < 20 GeV/c
T,jet
10 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 24 / 29
Angularity for Au+Au peripheral collisions at √sNN = 200 GeV
0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14 16 18
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au Anti-kT charged jets, R = 0.2 < 30 GeV/c
T,jet
20 < p 0.05 0.1 0.15 0.2 0.25 0.3
g
2 4 6 8 10 12 14
g /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au < 30 GeV/c
T,jet
20 < p Anti-kT charged jets, R = 0.4
Study of jet shapes in JEWEL at RHIC January, 17, 2019 25 / 29
Momentum dispersion for Au+Au peripheral collisions at √sNN = 200 GeV
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au < 30 GeV/c
T,jet
20 < p Anti-kT charged jets, R = 0.4 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au < 30 GeV/c
T,jet
20 < p Anti-kT charged jets, R = 0.4
Study of jet shapes in JEWEL at RHIC January, 17, 2019 26 / 29
Momentum dispersion for Au+A peripheral collisions at √sNN = 200 GeV
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au < 30 GeV/c
T,jet
20 < p Anti-kT charged jets, R = 0.4 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
D
T
p
1 2 3 4 5 6
D
T
p /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off = 200 GeV JEWEL
NN
s 60-80% Au+Au < 30 GeV/c
T,jet
20 < p Anti-kT charged jets, R = 0.4
Study of jet shapes in JEWEL at RHIC January, 17, 2019 27 / 29
LeSub for Au+Au peripheral collisions at √sNN = 200 GeV
5 10 15 20 25 30
] c , [GeV/ LeSub
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 60-80% Au+Au Anti-kT charged jets, R = 0.2 < 20 GeV/c
T,jet
10 < p
5 10 15 20 25 30
] c , [GeV/ LeSub
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 60-80% Au+Au Anti-kT charged jets, R = 0.4 < 20 GeV/c
T,jet
10 < p
Study of jet shapes in JEWEL at RHIC January, 17, 2019 28 / 29
LeSub for Au+Au peripheral collisions at √sNN = 200 GeV
5 10 15 20 25 30
] c , [GeV/ LeSub
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 60-80% Au+Au Anti-kT charged jets, R = 0.2 < 30 GeV/c
T,jet
20 < p
5 10 15 20 25 30
] c , [GeV/ LeSub
3 −
10
2 −
10
1 −
10
/GeV] c , [ LeSub /d
jets
N d
jets
N 1/
Vacuum Medium recoils on Medium recoils off
= 200 GeV JEWEL
NN
s 60-80% Au+Au < 30 GeV/c
T,jet
20 < p Anti-kT charged jets, R = 0.4
Study of jet shapes in JEWEL at RHIC January, 17, 2019 29 / 29