2011/12/31 by A. Uras, Antonio Uras, Uras, Antonio
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #nucl-ex
paper · pdf · doi:10.48550/arxiv.1201.0270
On behalf of the NA60 Collaboration. arXiv admin note: substantial text overlap with arXiv:1108.0970
arxiv created 2011/12/31 · openalex publication_date 2011/12/31 · arxiv updated 2012/01/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The NA60 experiment has studied low-mass muon pair production in proton-nucleus (p-A) collisions with a system of Be, Cu, In, W, Pb and U targets using a 400 GeV/c proton beam at the CERN SPS. Thanks to the collected data sample of 180 000 low mass muon pairs, the most precise measurement currently available was performed for the electromagnetic transition form factors of the η and ω mesons. The ρ line shape was quantitatively investigated, and its effective temperature measured for the first time in elementary collisions. The transverse momentum spectra for the ω and ϕ mesons have been studied in the full \pt range accessible, up to 2 GeV/c. The cross section ratios σρ/σω and σϕ/σω have been considered in full \pt as a function of the size of the production target. The nuclear dependence of the production cross sections of the η, ω and ϕ mesons has finally been studied in terms of the power law σpA ∝ Aα, where the α parameter has been found to increase as a function of \pt.