First results from NA60 on low mass muon pair production in In-In collisions at 158 GeV/nucleon
S. Damjanovic
Abstract
The NA60 experiment at the CERN SPS studies dimuon production in proton-nucleus and nucleus-nucleus collisions. The combined information from a novel vertex telescope made of radiation-tolerant silicon pixel detectors and from the muon spectrometer previously used in NA50 allows for a precise measurement of the muon vertex and a much improved dimuon mass resolution. We report on first results from the data taken for Indium-Indium collisions at 158 AGeV/nucleon in 2003, concentrating on a subsample of about 370 000 muon pairs in the mass range <1.2 GeV/c2. The light vector mesons ω and ϕ are completely resolved, with a mass resolution of about 23 MeV/c2 at the ϕ. The transverse momentum spectra of the ϕ are measured over the continuous range 0<p T<2.5 GeV/c; the inverse slope parameter of the spectra is found to increase with centrality, with an average value of T=2523 MeV.
Create a lesson
Related papers
Cumulative protons and pions at the intermediate energies in the FRAGM experiment
M. A. Martemianov, B. M. Abramov, S. A. Bulychjov et al.
Precise and accurate nuclear electric quadrupole moment of 223Ra from molecular spectroscopy
C. M. Fajardo-Zambrano, M. Athanasakis-Kaklamanakis, L. Lalanne et al.
Differential measurement of global polarization of Λ, Ξ, and Ω hyperons in Au+Au collisions at sNN=7.7--27~GeV from the RHIC Beam Energy Scan-II
The STAR Collaboration
Regularity of core coupled high-spin structure in neutron-rich 196-202Au isotopes approaching N =126
Y. Cho, Y. H. Kim, A. Navin et al.
Global polarization of Λ, Ξ, and Ω hyperons in Au+Au collisions from the RHIC Beam Energy Scan-II
STAR Collaboration
Probing the charm-quark dead cone effect in heavy ion collisions
CMS Collaboration