Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
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| Authors: | Adamová D,Agakichiev G,Appelsh?user H,Belaga V,Braun-Munzinger P,Cherlin A,Damjanovi? S,Dietel T,Dietrich L,Drees A,Esumi S I,Filimonov K,Fomenko K,Fraenkel Z,Garabatos C,Gl?ssel P,Hering G,Holeczek J,Kushpil V,Lenkeit B,Maas A,Marín A,Milosevi? J,Milov A,Mi?kowiec D,Panebrattsev Yu,Petchenova O,Petrácek V,Pfeiffer A,Rak J,Ravinovich I,Rehak P,Richter M,Sako H,Schmitz W,Sedykh S,Seipp W,Sharma A,Shimansky S,Slívová J,Specht H J,Stachel J,Sumbera M,Tilsner H,Tserruya I,Wessels J P,Wienold T,Windelband B,Wurm J P,Xie W,Yurevich S,Yurevich V CERES/NA Collaboration |
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| Affiliation: | NPI ASCR, Rez, Czech Republic. |
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| Abstract: | We report on first measurements of low-mass electron-positron pairs in Pb-Au collisions at the CERN SPS beam energy of 40 AGeV. The observed pair yield integrated over the range of invariant masses 0.2e(+)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. |
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