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

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Heavy ion physics at nica simulations g musulmanbekov v toneev and the physics group on nica

Heavy Ion Physics at NICASimulationsG.Musulmanbekov, V. Toneevand the Physics Group on NICA


  • 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



  • 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



Mean multiplicities in au au collisions simulated by urqmd min bias events
Mean multiplicities in Au-Au collisions at √sSimulated by UrQMD min.bias events 


Mean multiplicities in au au collisions simulated by urqmd central collisions b 3 fm
Mean multiplicities in Au-Au collisions at √sSimulated by UrQMD central collisions (b ≤ 3 fm) 


Mean multiplicities in au au collisions simulated by urqmd central collisions b 3 fm1
Mean multiplicities in Au-Au collisions at √sSimulated by UrQMD central collisions (b ≤ 3 fm) 


Mean multiplicities in au au collisions simulated by urqmd central collisions b 3 fm2
Mean multiplicities in Au-Au collisions at √sSimulated by UrQMD central collisions (b ≤ 3 fm) 


Simulated charged multiplicity distributions in central collisions b 3fm
Simulated charged multiplicity distributions at √sin central collisions (b < 3fm)



Simulated charged pseudorapidity distributions in central collisions b 3fm1
Simulated charged pseudorapidity distributions in central collisions (b < 3fm)

MPD

-2 < η < 2


Simulated charged pseudorapidity distributions in central collisions b 3fm2
Simulated charged pseudorapidity distributions in central collisions (b < 3fm)

MPD

-1 < η < 1


Strange baryons yield
Strange Baryons Yield collisions (b < 3fm)

Table: Marked hyperons are accessible through their decays into charged hadrons


Accessible hyperons
Accessible Hyperons collisions (b < 3fm)


Accessible hyperons1
Accessible Hyperons collisions (b < 3fm)

Λ → pπ-

Ξ- → Λπ- → pπ- π-

Ω- → ΛK- → pK- π-


Strange to non strange ratios in central collisions horn effect
Strange to non-Strange ratios in central collisions collisions (b < 3fm)“Horn” Effect

<π- >/<π+>

Au+Au/Pb+Pb, central

<K+ >/<π+>

Au+Au/Pb+Pb, central


Strange to non strange ratios in central collisions horn effect1
Strange to non-Strange ratios in central collisions collisions (b < 3fm)“Horn” Effect





Transverse mass spectra of mesons in central collisions
Transverse Mass Spectra of Mesons collisions (b < 3fm)in central collisions

T – inverse slope


Transverse mass spectra of mesons in central collisions1
Transverse Mass Spectra of Mesons collisions (b < 3fm)in central collisions


Transverse mass spectra of mesons in central collisions2
Transverse Mass Spectra of Mesons collisions (b < 3fm)in central collisions


Scaled multiplicity variances
Scaled multiplicity variances collisions (b < 3fm)

ω (h+)

ω (h-)

ω (hch)


Scaled multiplicity variances na49 results
Scaled multiplicity variances collisions (b < 3fm)NA49 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.


Transverse momentum fluctuations
Transverse momentum fluctuations collisions (b < 3fm)

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.


Directed flow v collisions (b < 3fm)1 & elliptic flow v2

z

x

Non-central Au+Au collisions:

Interactions between constituents leads to a pressure gradients => spartial asymmetry is converted in asymmetry in momentum space => collective flows

- directed flow

V2>0 indicates in-plane emission of particles

V2<0 corresponds to out-of-plane emission (squeeze-out perpendicular to the reaction plane)

- elliptic flow


Direct flow au au collisions at s nn 7gev b 5 9 fm
Direct flow collisions (b < 3fm)Au + Au collisions at √sNN = 7GeV, b = 5 – 9 fm


Direct flow slope collision energy dependence au au b 5 9 fm
Direct flow slope collisions (b < 3fm)Collision Energy Dependence Au + Au, b = 5 – 9 fm


Elliptic flow au au collisions at s nn 7gev b 5 fm
Elliptic flow collisions (b < 3fm)Au + Au collisions at √sNN = 7GeV, b = 5 fm


Elliptic flow collision energy dependence au au pb pb b 5 9 fm
Elliptic flow collisions (b < 3fm)Collision Energy Dependence Au+Au/Pb+Pb, b = 5 – 9 fm


HBT collisions (b < 3fm)interferometry

Rlong

p1

x1

p2

qside

Rside

x2

qout

qlong

Rout

  • HBT: Quantum interference between identical particles

2

C (q)

Gaussian model (3-d):

1

  • Final-state effects (Coulomb, strong) also can cause correlations, need to be accounted for

q (GeV/c)

  • Two-particle interferometry: p-space separation  space-time separation

Sergey Panitkin


Hbt interferometry
HBT interferometry collisions (b < 3fm)


HBT collisions (b < 3fm)interferometry


HBT collisions (b < 3fm)interferometry


Dilepton collisions (b < 3fm) Spectra


Dilepton collisions (b < 3fm) Spectra


Dilepton collisions (b < 3fm) Spectra


Dilepton collisions (b < 3fm) Spectra


Dilepton collisions (b < 3fm) Spectra


Conclusions
Conclusions collisions (b < 3fm)

New simulation codes which take into accountphase transitions of deconfinement and/or chiral symmetry restoration are needed.


Thank you

Thank you! collisions (b < 3fm)


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