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Low-mass lepton pair production in Pb-Au collisions at 40 A.GeV

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Abstract

The CERES/NA45 experiment at the CERN SPS has previously measurede + e - pair production in 160 A.GeV Pb-Au collisions. In the mass regionm > 02 GeV/c2, an enhancement of 2.7±04(stat.)±0.5(syst.) compared to the expectation from known hadronic decay sources was observed. In the 40 A.GeV data taken in 1999, an enhancement is again found; a preliminary analysis gives an even larger value of 50 ±13(stat.). The results are compared to theoretical model calculations based on π+π- annihilation with a modified ρ-propagator; they may be related to chiral symmetry restoration.

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Authors and Affiliations

  1. NPI/ASCR, Reiz, Czech Republic

    D. Adamová, V. Kushpil & M. Sumbera

  2. GSI, Darmstadt, Germany

    G. Agakichiev, P. Braun-Munzinger, C. Garabatos, G. Hering, J. Holeczek, A. Maas, A. Marín, D. Miśkowiec, J. Rak, H. Sako & S. Sedykh

  3. Physikalisches Institut, Universität Heidelberg, Germany

    H. Appelshäuser, S. Damjanović, T. Dietel, L. Dietrich, S. I. Esumi, P. Glässel, J. Milosević, V. Petrácek, M. Richter, W. Schmitz, W. Seipp, J. Slívová, H. J. Specht, J. Stachel, H. Tilsner, J. P. Wessels, T. Wienold, B. Windelband & S. Yurevich

  4. JINR, Dubna, Russia

    V. Belaga, K. Fomenko, Y. Panebrattsev, O. Petchenova, S. Shimansky & V. Yurevich

  5. Weizmann Institute, Rehovot, Israel

    A. Cherlin, Z. Fraenkel, A. Milov, I. Ravinovich, I. Tserruya & W. Xie

  6. Department for Physics and Astronomy, SUNY Stony Brook, USA

    A. Drees

  7. CERN, Geneva, Switzerland

    B. Lenkeit, A. Pfeiffer & J. Schukraft

  8. Brookhaven National Laboratory, Upton, USA

    P. Rehak

  9. Max-Planck-Institut für Kernphysik, Heidelberg, Germany

    J. P. Wurm

  10. LBNL, Berkeley, USA

    K. Filimonov

Authors
  1. D. Adamová
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  2. G. Agakichiev
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  3. H. Appelshäuser
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  4. V. Belaga
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  5. P. Braun-Munzinger
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  6. A. Cherlin
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  9. L. Dietrich
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  11. S. I. Esumi
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  12. K. Filimonov
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  13. K. Fomenko
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  14. Z. Fraenkel
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  15. C. Garabatos
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  16. P. Glässel
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  17. G. Hering
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  18. J. Holeczek
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  19. V. Kushpil
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  20. B. Lenkeit
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  21. A. Maas
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  22. A. Marín
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  23. J. Milosević
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  24. A. Milov
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  25. D. Miśkowiec
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  26. Y. Panebrattsev
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  27. O. Petchenova
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  28. V. Petrácek
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  29. A. Pfeiffer
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  30. J. Rak
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  32. P. Rehak
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  33. M. Richter
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  34. H. Sako
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  35. W. Schmitz
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  36. J. Schukraft
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  37. S. Sedykh
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  38. W. Seipp
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  39. S. Shimansky
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  40. J. Slívová
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  41. H. J. Specht
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  42. J. Stachel
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  43. M. Sumbera
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  44. H. Tilsner
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  45. I. Tserruya
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  46. J. P. Wessels
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  47. T. Wienold
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  50. W. Xie
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  51. S. Yurevich
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  52. V. Yurevich
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Adamová, D., Agakichiev, G., Appelshäuser, H. et al. Low-mass lepton pair production in Pb-Au collisions at 40 A.GeV. Pramana - J Phys 60, 1067–1072 (2003). https://doi.org/10.1007/BF02707032

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