heavy ion physics at nica simulations g.musulmanbekov, v. toneev and the physics group on nica
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Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA. Search for signals of Phase Transition in Au + Au collisions at √s NN = 3 – 9 GeV Motivation - PowerPoint PPT PresentationTRANSCRIPT
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Heavy Ion Physics at NICASimulations
G.Musulmanbekov, V. Toneevand the Physics Group on NICA
![Page 2: Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA](https://reader035.vdocuments.mx/reader035/viewer/2022062422/5681401e550346895dab771d/html5/thumbnails/2.jpg)
Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV
Motivation
• The main goal of the NICA experiment is to study the behaviour of nuclear matter in vicinity of the QCD critical endpoint.
• To extract information on the equation-of-state of baryonic matter at high densities.
• Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV
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Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV
Signatures of Possibile Phase Transition :
o Strange particle enhancement
o Hard spectrum of strange mesons
o Charmonium suppression
o Dielectron mass spectrum enhancement at the range 0.2 – 0.6 GeV/c
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Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV
Observables :
• Global characteristics of identified hadrons, including strange baryons
• Strange to non-strange particles ratio
• Transverse momentum spectra
• Fluctuations in multiplicity and transverse momenta
• Directed and elliptic flows
• Particle correlations (femtoscopy, HBT correlations)
• Dilepton spectra
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Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV
Simulation Tools :
• UrQMD 1.3, UrQMD 2.2o 104 central events at 3, 3.8, 5, 7, 9 GeVo 105 min bias events at 3, 3.8, 5, 7, 9 GeV
• FastMCo 104 central events at 3, 5, 7, 9 GeV
• PLUTO
o 106 central events at 3, 5, 7, 9 GeV
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Mean multiplicities in Au-Au collisions Simulated by UrQMD min.bias events
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Mean multiplicities in Au-Au collisions Simulated by UrQMD central collisions (b ≤ 3 fm)
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Mean multiplicities in Au-Au collisions Simulated by UrQMD central collisions (b ≤ 3 fm)
![Page 9: Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA](https://reader035.vdocuments.mx/reader035/viewer/2022062422/5681401e550346895dab771d/html5/thumbnails/9.jpg)
Mean multiplicities in Au-Au collisions Simulated by UrQMD central collisions (b ≤ 3 fm)
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Simulated charged multiplicity distributionsin central collisions (b < 3fm)
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Simulated charged pseudorapidity distributions in central collisions (b < 3fm)
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Simulated charged pseudorapidity distributions in central collisions (b < 3fm)
MPD-2 < η < 2
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Simulated charged pseudorapidity distributions in central collisions (b < 3fm)
MPD-1 < η < 1
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Strange Baryons Yield
Table: Marked hyperons are accessible through their decays into charged hadrons
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Accessible Hyperons
Mass(GeV/c2) Lifetime cτ (cm) Multiplicity Decay channel
BR(%) Registration efficiency (%)|p| > 0.1 GeV/c
-1 < y < 1
ΛΞ-
Ω-
1.1161.3211.672
7.894.912.46
39.81.210.03
p + π-
Λ + π-
Λ + K-
63.999.967.8
1685
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Accessible Hyperons
Λ → pπ- Ξ- → Λπ- → pπ- π- Ω- → ΛK- → pK- π-
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Strange to non-Strange ratios in central collisions
“Horn” Effect
<π- >/<π+>Au+Au/Pb+Pb, central
<K+ >/<π+>Au+Au/Pb+Pb, central
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Strange to non-Strange ratios in central collisions
“Horn” Effect
![Page 19: Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA](https://reader035.vdocuments.mx/reader035/viewer/2022062422/5681401e550346895dab771d/html5/thumbnails/19.jpg)
Strange to nonStrange ratios in central collisions
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Strange to nonStrange ratios in central collisions
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Strange to nonStrange ratios in central collisions
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Transverse Mass Spectra of Mesonsin central collisions
T
m
dm
dN
mT
TT
exp1
T – inverse slope
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Transverse Mass Spectra of Mesonsin central collisions
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Transverse Mass Spectra of Mesonsin central collisions
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Scaled multiplicity variances
i
ii
N
NN22
ω (h+)
ω (h-)
ω (hch)
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Scaled multiplicity variancesNA49 results
NA49 result: Measured scaled variances are close to the Poisson one – close to 1!No sign of increased fluctuations as expected for a freezeout near the critical point of strongly interacting matter was observed.
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Transverse momentum fluctuations
To exclude trivial fluctuations from consideration the following variable is used:
For the system of independently emitted particles (no inter-particle correlations) Фpt
goes to zero.
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Directed flow v1 & elliptic flow v2
x
zNon-central Au+Au collisions:
Interactions between constituents leads to a pressure gradients => spartial asymmetry is converted in asymmetry in momentum space
=> collective flows
22
22
yx
yx2
T
x1
21TTTT
pp
ppv
p
pv
...)cos(22v)cos(2v12π
1
dpdyp
dN
ddpdyp
dN
- directed flow
- elliptic flowV2>0 indicates in-plane emission of
particlesV2<0 corresponds to out-of-plane
emission (squeeze-out perpendicular to the reaction plane)
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Direct flow Au + Au collisions at √sNN = 7GeV, b = 5 – 9 fm
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Direct flow slopeCollision Energy Dependence
Au + Au, b = 5 – 9 fm
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Elliptic flow Au + Au collisions at √sNN = 7GeV, b = 5 fm
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Elliptic flow Collision Energy Dependence
Au+Au/Pb+Pb, b = 5 – 9 fm
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Sergey Panitkin
qout
qside
qlong
HBT interferometry
Rsi
de
R long
Rout
x1
x2
12 ppq
p1
p2
q
12 pp2
1k
Two-particle interferometry: p-space separation space-time separation
HBT: Quantum interference between identical particles
pairsevent mixed
pairsevent real
)(P)(P
),(P),(
21
2121
pp
ppppC
2long
2long
2side
2side
2out
2out)(1),(
RqRqRqekkqC
q (GeV/c)q (GeV/c)
C (
q)C
(q)
11
22R
1~
– Final-state effects (Coulomb, strong) also can cause correlations, need to be accounted for
Gaussian model (3-d):
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HBT interferometry
)qRqRqRexp(1)q,q,q(C 2S
2S
2O
2O
2L
2LLS0
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HBT interferometry
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HBT interferometry
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Dilepton Spectra
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Dilepton Spectra
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Dilepton Spectra
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Dilepton Spectra
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Dilepton Spectra
![Page 42: Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA](https://reader035.vdocuments.mx/reader035/viewer/2022062422/5681401e550346895dab771d/html5/thumbnails/42.jpg)
Conclusions
New simulation codes which take into accountphase transitions of deconfinement and/or chiral symmetry restoration are needed.
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Thank you!