Ceres/na45 Status Report
نویسندگان
چکیده
منابع مشابه
A New Robust Fitting Algorithm for Vertex Reconstruction in the Ceres Experiment
In this paper we report on the application of a robust approach based on a reweighted least squares method for the vertex reconstruction of the CERES/NA45 experiment at the CERN SPS for the case of 160 GeV/u Pb+Au collisions and compare its performance with the presently used algorithm based on the minimization of summed Gaussian weights. In the CERES/NA45 experiment a doublet of cylindrical si...
متن کامل/ 97 03 44 0 v 1 2 7 M ar 1 99 7 Comment on : “ Search for direct photons from S - Au Collisions at 200 GeV / nucleon ” by the CERES Collaboration
In this note we comment on a recent publication in this journal by the CERES (NA45) Collaboration [1]. The authors report to have determined an upper limit on the direct photon yield relative to the decay photon yield in S + Au collisions of 14 % and 7 % by two different methods, respectively. We argue that these limits are unsupported by the results and analysis of the CERES data. The systemat...
متن کاملRecent Results Fromthe Ceres / Na 45 Experiment Andupgrade with a Radial - Drift
The CERES/NA45 experiment measures low mass electron pair production in Pb-Au collisions at 158AGeV at the CERN SPS. In this paper, we present the electron pair enhancement in the mass range 0:2 < mee < 0:7 GeV/c 2 , it increases more than linear with charged multiplicity and is most pronounced at low pair pT < 0:5 GeV/c. Transverse mass and rapidity distributions for charged hadrons h + ? h ? ...
متن کاملElectromagnetic Radiation and in - Medium Effects
The theory of thermal photon and dilepton emission from hot and dense hadronic matter, as well as from the Quark-Gluon Plasma, is reviewed in the context of extracting in-medium properties of the matter constituents. In phenomenological applications to ultrarelativistic heavy-ion collisions we focus on low transverse-momentum ”anomalies” as recently observed in photon and dilepton spectra by WA...
متن کاملar X iv : h ep - p h / 01 02 19 2 v 1 1 5 Fe b 20 01 1 Dileptons and photons from central heavy - ion collisions at CERN - SPS
A unique parameterization of secondary (thermal) dilepton and photon yields in heavy-ion experiments at CERN-SPS is proposed. Adding those thermal yields to background contributions the spectral shapes of the CERES/NA45, NA38, NA50, HELIOS/3 and WA98 data from experiments with lead and sulfur beams can be well described.
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