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HK: Physik der Hadronen und Kerne

HK 21: Heavy Ions II

HK 21.4: Vortrag

Dienstag, 9. März 2004, 16:30–16:45, F

First Results from NA60 on Low-Mass Muon Pair Production in In-In Collisions at 158 AGeV — •Sanja Damjanović — Physikalisches Institut der Universität Heidelberg

The new NA60 experiment at the CERN SPS studies the production of muon pairs in nucleus-nucleus and proton-nucleus collisions. It combines the muon spectrometer and zero degree calorimeter previously used in NA50 with a novel 12-plane silicon pixel telescope within a 2.5 T dipole magnet in the target region, resulting in strong improvements of the invariant mass resolution and in the pair acceptance down to zero transverse momenta. The main physics goals refer to low-mass pairs including the vector mesons ω and φ, intermediate-mass pairs separated according to open charm and prompt thermal production, and high-mass pairs including anomalous charmonium suppression. During the first production beam time over 6 weeks with an Indium beam on a segmented In target in late 2003, about 250 million dimuon triggers were recorded. The total physics sample in the low-mass region is estimated to be about 1.5 million pairs after track matching to the pixel telescope. We report on first results from a subsample of the total.