dorsal/arxiv
View SchemaProbing the equation of state with pions
| Authors | Qingfeng Li, Zhuxia Li, Sven Soff, Marcus Bleicher, Horst Stoecker |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0509070 |
| URL | https://arxiv.org/abs/nucl-th/0509070 |
| DOI | 10.1088/0954-3899/32/2/007 |
| Journal | J.Phys. G32 (2006) 151-164 |
Abstract
The influence of the isospin-independent, isospin- and momentum-dependent equation of state (EoS), as well as the Coulomb interaction on the pion production in intermediate energy heavy ion collisions (HICs) is studied for both isospin-symmetric and neutron-rich systems. The Coulomb interaction plays an important role in the reaction dynamics, and strongly influences the rapidity and transverse momentum distributions of charged pions. It even leads to the $\pi^-/\pi^+$ ratio deviating slightly from unity for isospin-{\it symmetric} systems. The Coulomb interaction between mesons and baryons is also crucial for reproducing the proper pion flow since it changes the behavior of the directed and the elliptic flow components of pions visibly. The EoS can be better investigated in neutron-rich system if {\it multiple} probes are measured simultaneously. For example, the rapidity and the transverse momentum distributions of the charged pions, the $\pi^-/\pi^+$ ratio, the various pion flow components, as well as the {\it difference} of $\pi^+$-$\pi^-$ flows. A new sensitive observable is proposed to probe the symmetry potential energy at high densities, namely the transverse momentum distribution of the elliptic flow difference [$\Delta v_2^{\pi^+ - \pi^-}(p_t^{\rm c.m.})$].
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"abstract": "The influence of the isospin-independent, isospin- and momentum-dependent\nequation of state (EoS), as well as the Coulomb interaction on the pion\nproduction in intermediate energy heavy ion collisions (HICs) is studied for\nboth isospin-symmetric and neutron-rich systems. The Coulomb interaction plays\nan important role in the reaction dynamics, and strongly influences the\nrapidity and transverse momentum distributions of charged pions. It even leads\nto the $\\pi^-/\\pi^+$ ratio deviating slightly from unity for isospin-{\\it\nsymmetric} systems. The Coulomb interaction between mesons and baryons is also\ncrucial for reproducing the proper pion flow since it changes the behavior of\nthe directed and the elliptic flow components of pions visibly.\n The EoS can be better investigated in neutron-rich system if {\\it multiple}\nprobes are measured simultaneously. For example, the rapidity and the\ntransverse momentum distributions of the charged pions, the $\\pi^-/\\pi^+$\nratio, the various pion flow components, as well as the {\\it difference} of\n$\\pi^+$-$\\pi^-$ flows. A new sensitive observable is proposed to probe the\nsymmetry potential energy at high densities, namely the transverse momentum\ndistribution of the elliptic flow difference [$\\Delta v_2^{\\pi^+ -\n\\pi^-}(p_t^{\\rm c.m.})$].",
"arxiv_id": "nucl-th/0509070",
"authors": [
"Qingfeng Li",
"Zhuxia Li",
"Sven Soff",
"Marcus Bleicher",
"Horst Stoecker"
],
"categories": [
"nucl-th"
],
"doi": "10.1088/0954-3899/32/2/007",
"journal_ref": "J.Phys. G32 (2006) 151-164",
"title": "Probing the equation of state with pions",
"url": "https://arxiv.org/abs/nucl-th/0509070"
},
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