What have we learned from Monte Carlo models? HIJING

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Presentation transcript:

What have we learned from Monte Carlo models? HIJING Mohammed Aish Physics department Menoufia university Egypt Supervised by Oleg Vasilevich Rogachevsky 2009

CERN Outlines NICA RHIC QGP Introduction. Quark-Gluon Plasma - Phase Diagrame. Monte Carlo Calculation in case of Heavy ion collision- HIJING Model. Results from HIJING. Conclusion. Feature of the future.

Aim Of The Work Study of Au-Au collision at high energy Learn about the strong interaction Study V2 and Elliptical flow Using HIJING Monte Carlo Model Au Au

u c s e t d m b g g ne n n W Z The Standard Model Force Carriers Gravity - the ghost at the feast The Standard Model e electron ne e-neutrino d down up u I m muon n m-neutrino s strange c charm II t tau n t-neutrino b bottom top III g gluon Quarks g photon Force Carriers Z Z boson W W boson Leptons Generations of matter Higgs Boson? Higgs Boson

BOSONS SUSY Gravitino Photino Gluino FERMIONS

Quark-Gluon Plasma Phase Diagrame

Quark-Gluon Plasma High-energy nuclear collisions will compress and heat the heavy nuclei so much that their individual protons and neutrons overlap and lots of pions arise, creating the Quark-Gluon Plasma (QGP) QGP is thought to have existed ten millionths of second after the Big Bang; creating the primordial matter of universe in the laboratory, Little Bang.

Phase Diagram of Nuclear Matter q SPS AGS RHIC 150 MeV LHC Center of mass energies: for different accelerators AGS: √s ~ 5 GeV SPS : √s ~ 17 GeV RHIC: √s ~ 200 GeV LHC: √s ~ 5500 GeV hadrons quarks and gluons hadrons Let me now show the phase diagram of nuclear matter, temperature versus baryochemical potential / pressure. In a heavy ion collision we start from cold ground state nuclear matter which we accelerate and collide. By creating a high temperature and energy density in the system, nuclear matter undergoes an phase transition into the phase of a quark gluon plasma. (which is shown here) The system reaches its initial temperature and starts expanding and cooling down. With reaching the critical temperature the quarks and gluons passes that phase transition and hadronize. (shown here) We can vary with different accelerator energies the initial temperature of a collision. AGS,SPS,RHIC,LHC (Alternating Gradient Synchrotron) How do I get an estimate on the critical parameters of the phase transition namely the temperature and the energy density.

Monte Carlo Calculations in case of Heavy ion collision HIJING Model Can surprise you! Why?

Today's Monte Carlo models HIJING PYTHIA/FRITIOF NEXUS, VENUS DPM

Assumption of HIJING Model HIJING Model: Heavy ion Jet international Generator Model. Glauber MC Model: Glauber theory is based on the assumptions of 1- A characteristic nucleon-nucleon (nn) cross section 2-Straight line trajectories of the colliding nucleons

V2 Number of Charged HIJING Model for Au+Au collision at 60 GeV/n

V2 Number of Charged HIJING Model for Au+Au collision at 130 GeV/n

HIJING Model for Au+Au collision at 60 GeV/n

HIJING Model for Au+Au collision at 130 GeV/n

Conclusion V2 Elliptical flow, Rabidity Distribution, Npart and Ncoll predicted by the HIJING Monte Carlo for Au+Au and D+Au collision calculated.

Feature of the future Comparison between HIJING Monte Carlo calculation and CERN data can be done.