Coulomb distortion of π +/π − as a tool to determine the fireball radius in central high energy heavy ion collisions

Alejandro Ayala,Sangyong Jeon,Joseph Kapusta

doi:10.1016/s0375-9474(99)85091-x

Coulomb distortion of π +/π − as a tool to determine the fireball radius in central high energy heavy ion collisions

Alejandro Ayala, Sangyong Jeon + Show 1 more

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https://doi.org/10.1016/s0375-9474(99)85091-x

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Journal: Nuclear physics. A

Publication Date: Dec 1, 1999

Affiliation: Universidad Nacional Autónoma de México, Lawrence Berkeley National Laboratory, University of Minnesota

#Central High Energy Heavy Ion #High Energy Heavy Ion Collisions + Show 8 more

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Abstract

We compute the Coulomb distortion produced by an expanding and highly charged fireball on the spectra of low transverse momenta and mid rapidity pions produced in central high energy heavy ion collisions. We compare to data on Au+Au at 11.6 A GeV from E866 at the BNL AGS and of Pb+Pb at 158 A GeV from NA44 at the CERN SPS. We match the fireball expansion velocity with the average transverse momentum of protons and find a best fit to the charged pion ratio when the fireball radius is about 10 fm at freeze-out. This value is common to both AGS and SPS data.

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