heavy ion physics at nica simulations g musulmanbekov v toneev and the physics group on nica
Download
Skip this Video
Download Presentation
Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA

Loading in 2 Seconds...

play fullscreen
1 / 43

Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA - PowerPoint PPT Presentation


  • 155 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Heavy Ion Physics at NICA Simulations G.Musulmanbekov, V. Toneev and the Physics Group on NICA' - devon


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2

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
slide3

Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV

  • Signatures of Possibile Phase Transition :
      • Strange particle enhancement
      • Hard spectrum of strange mesons
      • Charmonium suppression
      • Dielectron mass spectrum enhancement at the range 0.2 – 0.6 GeV/c
slide4

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
slide5

Search for signals of Phase Transition in Au + Au collisions at √sNN = 3 – 9 GeV

  • Simulation Tools :
  • UrQMD 1.3, UrQMD 2.2
    • 104 central events at 3, 3.8, 5, 7, 9 GeV
    • 105 min bias events at 3, 3.8, 5, 7, 9 GeV
  • FastMC
    • 104 central events at 3, 5, 7, 9 GeV
  • PLUTO
    • 106 central events at 3, 5, 7, 9 GeV
strange baryons yield
Strange Baryons Yield

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

accessible hyperons1
Accessible Hyperons

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“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“Horn” Effect
scaled multiplicity variances
Scaled multiplicity variances

ω (h+)

ω (h-)

ω (hch)

scaled multiplicity variances na49 results
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.

transverse momentum fluctuations
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.

slide28

Directed flow v1 & 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

slide33

HBT 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

conclusions
Conclusions

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

ad