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Partonic effects on pion interferometry at the relativistic heavy-ion collider
Zi-Wei Lin1, C M Ko, Subrata Pal
1Cyclotron Institute and Physics Department, Texas A&M University, College Station 77843-3366, USA.
Physical Review Letters
|October 9, 2002
Summary
The multiphase transport model reveals that pion interferometry at the Relativistic Heavy-Ion Collider depends on parton interactions. This analysis shows non-Gaussian pion emission sources, impacting the extracted source radii.
Area of Science:
- Nuclear Physics
- High-Energy Physics
- Quantum Chromodynamics
Background:
- Pion interferometry is a key tool for studying the space-time extent of particle-emitting sources in high-energy collisions.
- Understanding the transition from partonic to hadronic matter is crucial for comprehending the state of nuclear matter under extreme conditions.
Purpose of the Study:
- To investigate pion interferometry using a multiphase transport model at the Relativistic Heavy-Ion Collider (RHIC).
- To determine the sensitivity of the two-pion correlation function to the parton-scattering cross section and its role in the partonic-hadronic transition.
- To characterize the emission source of pions and assess the impact of its non-Gaussian nature on extracted source radii.
Main Methods:
- Utilized a multiphase transport model incorporating initial partonic and final hadronic interactions.
- Analyzed two-pion correlation functions to probe the properties of the particle-emitting source.
- Compared source radii derived from non-Gaussian fits with those from Gaussian fits.
Main Results:
- The two-pion correlation function is sensitive to the parton-scattering cross section, influencing the parton density at the partonic-hadronic matter transition.
- The pion emission source was found to be non-Gaussian.
- Extracted source radii were more than twice as large as those obtained from Gaussian fits.
Conclusions:
- The study highlights the importance of considering both partonic and hadronic interactions in multiphase transport models for accurate analysis of heavy-ion collisions.
- The non-Gaussian nature of the pion emission source significantly affects the determination of source sizes, necessitating advanced analysis techniques.
- Results provide insights into the properties of matter created at RHIC and the dynamics of the phase transition.
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