NA60 results on thermal dimuons

Arnaldi, R.; Banicz, K.; Borer, K.; Castor, J.; Chaurand, B.; Chen, W.; Cicalo, C.; Colla, A.; Cortese, P.; Damjanovic, S.; David, A.; De Falco, Alessandro; Devaux, A.; Ducroux, L.; En'Yo, H.; Fargeix, J.; Ferretti, A.; Floris, M.; Foerster, A.; Force, P.; Guettet, N.; Guichard, A.; Gulkanian, H.; Heuser, J. M.; Keil, M.; Kluberg, L.; Li, Z.; Lourenco, C.; Lozano, J.; Manso, F.; Martins, P.; Masoni, A.; Neves, A.; Ohnishi, H.; Oppedisano, C.; Parracho, P.; Pillot, P.; Poghosyan, T.; Puddu, Giovanna; Radermacher, E.; Ramalhete, P.; Rosinsky, P.; Scomparin, E.; Seixas, J.; Serci, S.; Shahoyan, R.; Sonderegger, P.; Specht, H. J.; Tieulent, R.; Usai, Gianluca; Veenhof, R.; Woehri, H. K.

Abstract: The NA60 experiment at the CERN SPS has measured muon pairs with unprecedented precision in 158 A GeV In-In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2 < M < 2.6 GeV. The mass spectrum for M < 1 GeV is consistent with a dominant contribution from pi (+) pi (-)->rho ->mu (+) mu (-) annihilation. The associated rho spectral function shows a strong broadening, but essentially no shift in mass. For M > 1 GeV, the excess is found to be prompt, not due to enhanced charm production, with pronounced differences to Drell-Yan pairs. The slope parameter T (eff) associated with the transverse momentum spectra rises with mass up to the rho, followed by a sudden decline above. The rise for M < 1 GeV is consistent with radial flow of a hadronic emission source. The seeming absence of significant flow for M > 1 GeV and its relation to parton-hadron duality is discussed in detail, suggesting a dominantly partonic emission source in ...

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Titolo:	NA60 results on thermal dimuons
Autori:	R. ARNALDI K. BANICZ K. BORER J. CASTOR B. CHAURAND W. CHEN C. CICALO A. COLLA P. CORTESE S. DAMJANOVIC A. DAVID DE FALCO, ALESSANDRO A. DEVAUX L. DUCROUX H. EN'YO J. FARGEIX A. FERRETTI M. FLORIS A. FOERSTER P. FORCE N. GUETTET A. GUICHARD H. GULKANIAN J. M. HEUSER M. KEIL L. KLUBERG Z. LI C. LOURENCO J. LOZANO F. MANSO P. MARTINS A. MASONI A. NEVES H. OHNISHI C. OPPEDISANO P. PARRACHO P. PILLOT T. POGHOSYAN PUDDU, GIOVANNA E. RADERMACHER P. RAMALHETE P. ROSINSKY E. SCOMPARIN J. SEIXAS S. SERCI R. SHAHOYAN P. SONDEREGGER H. J. SPECHT R. TIEULENT USAI, GIANLUCA R. VEENHOF H. K. WOEHRI mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2009
Abstract:	Abstract: The NA60 experiment at the CERN SPS has measured muon pairs with unprecedented precision in 158 A GeV In-In collisions. A strong excess of pairs above the known sources is observed in the whole mass region 0.2 < M < 2.6 GeV. The mass spectrum for M < 1 GeV is consistent with a dominant contribution from pi (+) pi (-)->rho ->mu (+) mu (-) annihilation. The associated rho spectral function shows a strong broadening, but essentially no shift in mass. For M > 1 GeV, the excess is found to be prompt, not due to enhanced charm production, with pronounced differences to Drell-Yan pairs. The slope parameter T (eff) associated with the transverse momentum spectra rises with mass up to the rho, followed by a sudden decline above. The rise for M < 1 GeV is consistent with radial flow of a hadronic emission source. The seeming absence of significant flow for M > 1 GeV and its relation to parton-hadron duality is discussed in detail, suggesting a dominantly partonic emission source in ...
Handle:	http://hdl.handle.net/11584/21317
ISBN:	1434-6044
Tipologia:	4.1 Contributo in Atti di convegno

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