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Enhanced production of low mass electron pairs in 40-AGeV Pb - Au collisions at the CERN SPS

Collaboration
Sep, 2002
5 pages
Published in:
  • Phys.Rev.Lett. 91 (2003) 042301
e-Print:
DOI:
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Abstract: (arXiv)
We report on first measurements of low-mass electron pairs in Pb-Au collisions at the lower SPS beam energy of 40 AGeV. The pair yield integrated over the range of invariant masses 0.2<m<1 GeV/c^2 is enhanced by a factor of 5.1+-1.3(stat)+-1.0/1.5(syst data/decays) over the expectation from neutral meson decays, more than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi+ pi- -> e+ e- annihilation with a modified rho-propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.
  • scattering: heavy ion
  • gold
  • lead
  • electron: pair production
  • mass spectrum: (positron electron)
  • meson: leptonic decay
  • pi+ pi-: annihilation
  • rho(770): propagator
  • critical phenomena: chiral
  • baryon: density
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