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Performance of the ALICE VZERO system
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Performance of the ALICE VZERO system
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ALICE is an LHC experiment devoted to the study of strongly interacting matter in proton-proton, proton--nucleus and nucleus-nucleus collisions at ultra-relativistic energies. The ALICE VZERO system, made of two scintillator arrays at asymmetric positions, one on each side of the interaction point, plays a central role in ALICE. In addition to its core function as a trigger, the VZERO system is used to monitor LHC beam conditions, to reject beam-induced backgrounds and to measure basic physics quantities such as luminosity, particle multiplicity, centrality and event plane direction in nucleus-nucleus collisions. After describing the VZERO system, this publication presents its performance over more than four years of operation at the LHC.
Forward citations
Cited by 3 Pith papers
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Modification of jet-energy flow in heavy-ion collisions
ALICE measures the radial jet-energy flow observable Δp_T in Pb-Pb (5.02 TeV) and pp (13 TeV) collisions and reports narrowing of the energy distribution in heavy-ion collisions at 3.5-4.5σ significance.
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First measurement of $\mathbf{\rm \Xi_{\rm c}^{0}}$ production in $\mathbf{Pb}-\mathbf{Pb}$ collisions at $\mathbf{\sqrt{\textit{s}_{\rm NN}}}$ = 5.02 TeV
First measurement of prompt Ξ_c^0 baryon production in Pb–Pb collisions at √s_NN=5.02 TeV finds a nuclear modification factor reaching about 3 in the 3 < p_T < 4 GeV/c interval in 0–10% central events.
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Precision mass measurements of multistrange baryons and their antiparticles
ALICE reports mass measurements of Ω−, Ξ− and antiparticles at ~60 ppm precision via invariant-mass reconstruction in pp collisions, calibrated on K0S and Λ, reducing lattice QCD scale uncertainty.
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