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Effects of chain decays, radial flow and U A(1) restoration on the low-mass dilepton enhancement in $$\sqrt {s_{NN} } = 200$$ GeV Au+Au reactions

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Vargyas M., Csörgő T., Vértesi R.

Open Physics

2013

vol. 11

issue 5

553-559

In $$\sqrt {s_{NN} } = 200$$ GeV Au+Au collisions PHENIX reported a significant enhancement in the low-mass region (0.1 < m ee < 0.7 GeV) of the dielectron spectrum, which is still not fully understood. Several theoretical works and an indirect measurement suggest, due to the possible restoration of the U A(1) part of the chiral symmetry in a hot and dense medium, that the mass of the η′ meson may substantially decrease. This work reports on a statistically acceptable description of the PHENIX low-mass dilepton enhancement using a radial flow dominated meson spectra, chain decays of long-lived resonances and an in-medium η′ mass modification.

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1 Open Physics

1 2013

1 Csörgő T.

1 Vargyas M.

1 Vértesi R.

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Effects of chain decays, radial flow and U A(1) restoration on the low-mass dilepton enhancement in $$\sqrt {s_{NN} } = 200$$ GeV Au+Au reactions