Results on leptonic probes from NA50 (original) (raw)
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First results of the NA60 experiment at the CERN SPS
Nuclear Physics A, 2005
The NA60 experiment at the CERN SPS studies dimuon production in proton and heavy ion collisions. Its silicon pixel vertex telescope allows tracking of muon pairs in the vertex region, complementing the information from the muon spectrometer, and improving the mass resolution and signal-to-noise ratio. First results from the In-In data taking are shown for the light resonances and the J/ψ meson production.
Proposal Measurement of High-Mass Dimuon Production at the 50-GeV Proton Synchrotron April 28 , 2006
2006
We propose the construction of a spectrometer at J-PARC designed for the detection of high-mass dimuons produced in the interactions of 30 GeV and 50 GeV proton beams with various targets. Through the detections of the Drell-Yan, J/Ψ and Ψ′, and single muon events, a broad physics program addressing various issues in QCD can be pursued. At the initial phase of 30 GeV running at J-PARC, the production and decay characteristics of J/Ψ and Ψ′ can be studied. After the 50 GeV proton beam becomes available, unique measurements of the nucleon sea-quark flavor asymmetry and the antiquark contents in nuclei can be performed over the large Bjorken-x region of 0.25 < x < 0.6. Furthermore, the effects of energy loss for fast quarks traversing nuclear medium could also be sensitively measured. Moreover, a rich program of spin-dependent structure function physics can be carried out through the measurements of unpolarized, singly polarized, and doubly polarized Drell-Yan processes. The cons...
The NUCLEON experiment: The current status
Bulletin of the Russian Academy of Sciences: Physics, 2007
The main purpose of the NUCLEON experiment is direct measurements of the energy spectra of cosmic rays in the range 10 11-10 15 eV with the use of the lightweight facility during a prolonged orbital flight. The energy is determined using a technique based on the measurement of the spatial density of secondary particles produced in the initial event of inelastic interaction. The schematic diagram of the NUCLEON facility, the current status of the project, the results of testing the prototype, and plans are presented.
The European Physical Journal Conferences
Preliminary results on K 0 S production in p+C interactions at 31 GeV/c using data registered during the 2007 run are shown. In addition, an overview of charged pion and koan results is presented. These results are needed for the high precision determination of background contamination in the neutrino beam of the Tokai to Kamioka (T2K) experiment at J-PARC. Performance of the NA61/SHINE detector is discussed. Inclusive production cross sections for π − , π + , K + , and K 0 S as a function of laboratory momentum and polar angle with statistical and systematic errors are shown. The K + / π + , K 0 S /K + , and K 0 /π − ratios are also presented.
Search for resonances in the dilepton mass distribution in pp collisions at TeV
Journal of High Energy Physics, 2011
A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment at the CERN LHC, using pp collision data recorded at √ s = 7 TeV. The event samples correspond to integrated luminosities of 40 pb −1 in the dimuon channel and 35 pb −1 in the dielectron channel. Heavy dilepton resonances are predicted in theoretical models with extra gauge bosons (Z ) or as Kaluza-Klein graviton excitations (G KK ) in the Randall-Sundrum model. Upper limits on the inclusive cross section of Z (G KK ) → + − relative to Z → + − are presented. These limits exclude at 95% confidence level a Z with standard-modellike couplings below 1140 GeV, the superstring-inspired Z ψ below 887 GeV, and, for values of the coupling parameter k/M Pl of 0.05 (0.1), Kaluza-Klein gravitons below 855 (1079) GeV.
The NA49 large acceptance hadron detector
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 1999
The NA49 detector is a wide acceptance spectrometer for the study of hadron production in p+p, p+A, and A+A collisions at the CERN SPS. The main components are 4 large-volume TPCs for tracking and particle identification via dE/dx. TOF scintillator arrays complement particle identification. Calorimeters for transverse energy determination and triggering, a detector for centrality selection in p+A collisions, and beam definition detectors complete the set-up. A description of all detector components is given with emphasis on new technical realizations. Performance and operational experience are discussed in particular with respect to the high track density environment of central Pb+Pb collisions.
First results from the NA60 experiment at CERN
Since 1986, several heavy ion experiments have studied some signatures of the formation of the quark-gluon plasma and a few exciting results have been found. However, some important questions are still unanswered and require new measurements. The NA60 experiment, with a new detector concept that vastly improves dimuon detection in proton-nucleus and heavy-ion collisions, studies several of those open questions, including the production of open charm. This paper presents the experiment and some first results from data collected in 2002.