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First results on angular distributions of thermal dileptons in nuclear collisions

Articolo
Data di Pubblicazione:
2009
Abstract:
The NA60 experiment at the CERN Super Proton Synchrotron has studied dimuon production in 158A GeV In-In collisions. The strong excess of pairs above the known sources found in the complete mass region 0.2 < M < 2.6 GeV has previously been interpreted as thermal radiation. We now present first results on the associated angular distributions. Using the Collins-Soper reference frame, the structure function parameters lambda, mu, and nu are measured to be zero, and the projected distributions in polar and azimuth angles are found to be uniform. The absence of any polarization is consistent with the interpretation of the excess dimuons as thermal radiation from a randomized system.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
R. Arnaldi; K. Banicz; J. Castor; B. Chaurand; W. Chen; C. Cicalo; A. Colla; P. Cortese; S. Damjanovic; A. David; A. de Falco; A. Devaux; L. Ducroux; H. Enyo; J. Fargeix; A. Ferretti; M. Floris; P. Force; A. Forster; N. Guettet; A. Guichard; H. Gulkanian; J. Heuser; M. Keil; L. Kluberg; C. Lourenco; J. Lozano; F. Manso; P. Martins; A. Masoni; A. Neves; H. Ohnishi; C. Oppedisano; P. Parracho; P. Pillot; T. Poghosyan; G. Puddu; E. Radermacher; P. Ramalhete; P. Rosinsky; E. Scomparin; J. Seixas; S. Serci; R. Shahoyan; P. Sonderegger; H.J. Specht; R. Tieulent; G. Usai; R. Veenhof; H. Wohri .
Autori di Ateneo:
FERRETTI Alessandro
Link alla scheda completa:
https://iris.unito.it/handle/2318/75409
Pubblicato in:
PHYSICAL REVIEW LETTERS
Journal
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