Analysis of low energy pion spectra

Details Analysis of low energy pion spectra Analysis of low energy pion spectra

2007-04-12

arxiv.org/abs/0704.1529v1

Physics

Nuclear Physics

Nuclear Theory

3 pages, 2 figures

Scientific paper

The transverse mass spectra and the rapidity distributions of $\pi^+$ and $\pi^-$ in Au-Au collisions at 2, 4, 6, and 8 GeV$\cdot$A by E895 collaboration are fitted using an elliptically expanding fireball model with the contribution from the resonance decays and the final state Coulomb interaction. The ratio of the total number of produced $\pi^-$ and $\pi^+$ is used to fit the data. The resulting freeze-out temperature is rather low($T_f < 60$ MeV) with large transverse flow and thus resonance contribution is very small. The difference in the shape of $m_t$ spectra of the oppositely charged pions are found to be due to the Coulomb interaction of the pions.

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