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Journal Articles Physical Review Letters Year : 2008

Evidence for radial flow of thermal dileptons in high-energy nuclear collisions

R. Arnaldi
  • Function : Author
K. Banicz
  • Function : Author
C. Cicalo
  • Function : Author
A. Colla
  • Function : Author
P. Cortese
  • Function : Author
S. Damjanovic
  • Function : Author
A. David
  • Function : Author
A. de Falco
  • Function : Author
H. En'Yo
  • Function : Author
A. Ferretti
  • Function : Author
A. Forster
  • Function : Author
H. Gulkanian
  • Function : Author
J.M. Heuser
  • Function : Author
M. Keil
  • Function : Author
J. Lozano
  • Function : Author
P. Martins
A. Masoni
  • Function : Author
A. Neves
  • Function : Author
H. Ohnishi
  • Function : Author
C. Oppedisano
  • Function : Author
P. Parracho
  • Function : Author
Philippe Pillot
T. Poghosyan
  • Function : Author
G. Puddu
  • Function : Author
E. Radermacher
  • Function : Author
P. Ramalhete
  • Function : Author
P. Rosinsky
  • Function : Author
E. Scomparin
  • Function : Author
J. Seixas
  • Function : Author
S. Serci
  • Function : Author
R. Shahoyan
  • Function : Author
P. Sonderegger
  • Function : Author
H.J. Specht
  • Function : Author
G. Usai
  • Function : Author
R. Veenhof
  • Function : Author

Abstract

The NA60 experiment at the CERN SPS has studied low-mass dimuon production in 158 AGeV In-In collisions. An excess of pairs above the known meson decays has been reported before. We now present precision results on the associated transverse momentum spectra. The slope parameter Teff extracted from the spectra rises with dimuon mass up to the rho, followed by a sudden decline above. While the initial rise is consistent with the expectations for radial flow of a hadronic decay source, the decline signals a transition to an emission source with much smaller flow. This may well represent the first direct evidence for thermal radiation of partonic origin in nuclear collisions.

Dates and versions

in2p3-00186996 , version 1 (13-11-2007)

Identifiers

Cite

R. Arnaldi, K. Banicz, J. Castor, B. Chaurand, C. Cicalo, et al.. Evidence for radial flow of thermal dileptons in high-energy nuclear collisions. Physical Review Letters, 2008, 100, pp.022302. ⟨10.1103/PhysRevLett.100.022302⟩. ⟨in2p3-00186996⟩
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