Volume 80, Number 2, October 2007
|Number of page(s)||6|
|Published online||28 September 2007|
Isospin and isospin/strangeness correlations in relativistic heavy-ion collisions
Rutgers University, Department of Physics and Astronomy - Piscataway, NJ 08854, USA and California Institute of Technology, Kellogg Radiation Lab 106-38 - Pasadena, CA 91125, USA
Accepted: 3 September 2007
A fundamental symmetry of nuclear and particle physics is isospin whose third component is the Gell-Mann/Nishijima expression . The role of isospin symmetry in relativistic heavy-ion collisions is studied. An isospin IZ, strangeness S correlation is shown to be a direct and simple measure of flavor correlations, vanishing in a Qg phase of uncorrelated flavors in both symmetric and asymmetric N Z systems. By contrast, in a hadron phase, a correlation exists as long as the electrostatic charge chemical potential 0 as in N Z asymmetric systems. A parallel is drawn with a Zeeman effect which breaks a spin degeneracy.
PACS: 25.75.-q – Relativistic heavy-ion collisions / 25.75.Gz – Particle correlations / 25.75.Nq – Quark deconfinement, quark-gluon plasma production, and phase transitions
© Europhysics Letters Association, 2007
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