Freeze-out from HBT and Coulomb Effects
نویسنده
چکیده
The freeze-out of hot and dense hadronic matter formed in relativistic nuclear collisions is probed by HBT interferometry of identical pions, kaons, etc. Coulomb repulsion/attraction of positive/negative particles show up at small particle momenta and is also very sensitive to the freeze-out conditions. The source sizes and times freeze-out are extracted from π/π spectra and HBT radii and compared.
منابع مشابه
HBT with Space- vs. Time-like Hydrodynamic Freezeout
Bose-Einstein correlations in relativistic heavy ion collisions and their dependence on the freeze-out condition in hydrodynamic models is examined. The Cooper & Frye space-like freeze-out mechanism is compared to time-like freeze-out, where particles are emitted away only from the surface, i.e. spacevs. time-like freeze-out. The corresponding HBT radii are calculated for the two models emphasi...
متن کاملl - th / 0 60 90 54 v 1 1 9 Se p 20 06 Pion correlations in hydro - inspired models with resonances ∗
The effects of shape of the freeze-out hypersurface and resonance decays on the pion correlation functions in relativistic heavy-ion collisions are studied with help of the hydro-inspired models with single freeze-out. The heavy-ion Monte-Carlo generator THERMINATOR is used to generate hadronic events describing production of particles from a thermalized and expanding source. We find that the s...
متن کاملCoulomb Effects on Particle Spectra in Relativistic Nuclear Collisions
Coulomb effects on π± and K± spectra in relativistic nuclear collisions are investigated. At collision energies around 1 GeV the ratio of π− to π is enhanced several times at low transverse momenta but less at ultrarelativistic energies. We describe the ratios at SIS, AGS and SPS energies with simple analytic models as well as more elaborate numerical models incorporating the expansion dynamics...
متن کاملDoes HBT Measure the Freeze-out Source Distribution?
It is generally assumed that as a result of multiple scattering, the source distribution measured in HBT interferometry corresponds to a chaotic source at freeze-out. This assumption is subject to question as effects of multiple scattering in HBT measurements must be investigated within a quantum-mechanical framework. Applying the Glauber multiple scattering theory at high energies and the opti...
متن کاملth / 0 20 80 68 v 1 2 9 A ug 2 00 2 1 Collective flow and HBT radii from a full 3 D hydrodynamic model with early chemical freeze out
From the particle ratios and the transverse momentum spectra of hadrons in relativistic heavy ion collisions, one can obtain chemical freeze-out temperature T ch and thermal freeze-out temperature T th through the analyses of statistical models [1]. These temperatures are usually different from each other at the AGS, SPS and RHIC energies, i.e., T ch ∼ 160-200 MeV while T th ∼ 100-140 MeV. This...
متن کامل