First measurement of the rho spectral function in nuclear collisions - INSPIRE

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First measurement of the rho spectral function in nuclear collisions

S. Damjanovic
(
- CERN
)

Sep, 2006

6 pages

Part of Proceedings, Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus-Nucleus Collisions (Hot Quarks 2006) : Villasimius, Italy, May 15-20, 2006

Published in:

Eur.Phys.J.C 49 (2007) 235-241

Contribution to:

Hot Quarks 2006

e-Print:

nucl-ex/0609026 [nucl-ex]

DOI:

10.1140/epjc/s10052-006-0060-2

Report number:

EPJ-16-09

Experiments:

CERN-NA-060

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Abstract:

The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size close to 400K events and the good mass resolution of about 2% made it possible to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum shows some non-trivial centrality dependence, but is largely consistent with a dominant contribution from pi+pi- ->rho ->mu+mu- annihilation. The associated rho spectral function exhibits considerable broadening, but essentially no shift in mass. The pT-differential mass spectra show the excess to be much stronger at low pT than at high pT. The results are compared to theoretical model predictions: they tend to rule out models linking hadron masses directly to the chiral condensate.

Note:

6 pages, 9 figures, To appear in the proceedings of Hot Quarks 2006, Villasimius, Italy, 15-20 May 2006 Report-no: EPJ-16-09

12.38.Mh
13.85.Qk
25.75.-q
talk: Villasimius 2006/05/15
scattering: heavy ion
indium
muon: pair production
mass spectrum: dimuon
vector meson: leptonic decay
impact parameter: dependence

References(26)

Figures(0)

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