1,725,748 research outputs found
Production of identified and unidentified charged hadrons in Pb--Pb collisions at \sqrts_\rm NN~5.02~TeV
No full textIn late 2015, the ALICE collaboration recorded data from Pb--Pb collisions at
the unprecedented energy of \sqrts_\rm NN~5.02~TeV. The transverse-momentum
(p_\rm T) spectra of pions, kaons and protons are presented. The evolution
of the particle ratios as a function of collision energy and centrality is
discussed. The ratio between p_\rm T-integrated particle yields are
measured and compared to different collision energies as well as smaller
collision systems. For the study of energy loss mechanisms in the QCD medium at
high transverse momenta, the nuclear modification factors () are
computed and compared with results obtained at lower energy
ALICE Collaboration
No full textWe explain a connection between the combinatorial Kashiwara-Vergne conjectureand the Kontsevich formula for quantization of Poisson manifold
Portrait of Luciano Musa, ALICE Collaboration Spokesperson
No full textPortrait of Dr. Luciano Musa - ALICE Collaboration Spokesperso
Performance of the ALICE SPD cooling system
No full textThe new generation of silicon detectors for particle physics requires very reduced mass and high resistance to radiations with very limited access to the detector for maintenance. The Silicon Pixel Detector (SPD) is one of the 18 detectors of the ALICE (A Large Ion Collider Experiment) experiment at the Large Hadron Collider (LHC) at CERN. It constitutes the two innermost layers of the Inner Tracking System (ITS) and it is the closest detector to the interaction point.
An evaporative cooling system, based on C4F10 evaporation at 1.9 bar, was chosen to extract the 1.35 kW power dissipated by the on-detector electronics. The whole system was extensively tested and commissioned before its installation inside the ALICE experimental area. Since then we had to deal with a decrease of the flow in some lines of the system that imposed severe restrictions on the detector operation. Recently, a test bench has been built in order to carry out a series of tests to reproduce the misbehaviour of the system and investigate proper actions to cure the problem.
The performance of the systems and the most interesting results of the above mentioned tests will be presented
Operational experience with the ALICE pixel detector
No full textThe Silicon Pixel Detector (SPD) constitutes the two innermost layers of
the Inner Tracking System of the ALICE experiment and it is the closest
detector to the interaction point. As a vertex detector, it has the
unique feature of generating a trigger signal that contributes to the L0
trigger of the ALICE experiment. The SPD started collecting data since
the very first pp collisions at LHC in 2009 and since then it has taken
part in all pp, Pb-Pb and p-Pb data taking campaigns. This contribution
will present the main features of the SPD, the detector performance and
the operational experience, including calibration and optimization
activities from Run 1 to Run 2
Demographics of the ALICE Collaboration
No full textThe ALICE Collaboration at the LHC is made up of around 1900 people from 39 countries. These proceedings discuss the composition of the Collaboration in terms of gender and career status. The distribution of responsibilities among various demographic groups will also be presented, and the time evolution of these statistics will be explored
Coherent J/ψ photoproduction at forward rapidity in ultra-peripheral Pb–Pb collisions at √sNN = 5.02 TeV
No full textThe ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy √sNN=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0peerReviewe
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