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  1. Free, publicly-accessible full text available September 1, 2025
  2. A<sc>bstract</sc>

    Measurements of inclusive charged-particle jet production in pp and p-Pb collisions at center-of-mass energy per nucleon-nucleon collision$$ \sqrt{s_{\textrm{NN}}} $$sNN= 5.02 TeV and the corresponding nuclear modification factor$$ {R}_{\textrm{pPb}}^{\textrm{ch}\ \textrm{jet}} $$RpPbchjetare presented, using data collected with the ALICE detector at the LHC. Jets are reconstructed in the central rapidity region |ηjet|<0.5 from charged particles using the anti-kTalgorithm with resolution parametersR= 0.2, 0.3, and 0.4. ThepT-differential inclusive production cross section of charged-particle jets, as well as the corresponding cross section ratios, are reported for pp and p-Pb collisions in the transverse momentum range 10<$$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$pT,jetch<140 GeV/cand 10<$$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$pT,jetch<160 GeV/c, respectively, together with the nuclear modification factor$$ {R}_{\textrm{pPb}}^{\textrm{ch}\ \textrm{jet}} $$RpPbchjetin the range 10<$$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$pT,jetch<140 GeV/c. The analysis extends thepTrange of the previously-reported charged-particle jet measurements by the ALICE Collaboration. The nuclear modification factor is found to be consistent with one and independent of the jet resolution parameter with the improved precision of this study, indicating that the possible influence of cold nuclear matter effects on the production cross section of charged-particle jets in p-Pb collisions at$$ \sqrt{s_{\textrm{NN}}} $$sNN= 5.02 TeV is smaller than the current precision. The obtained results are in agreement with other minimum bias jet measurements available for RHIC and LHC energies, and are well reproduced by the NLO perturbative QCD Powhegcalculations with parton shower provided by Pythia8 as well as by Jetscapesimulations.

     
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    Free, publicly-accessible full text available May 1, 2025
  3. Recent measurements of charm-baryon production in hadronic collisions have questioned the universality of charm-quark fragmentation across different collision systems. In this work the fragmentation of charm quarks into charm baryons is probed, by presenting the first measurement of the longitudinal jet momentum fraction carried byΛc+baryons,zch, in hadronic collisions. The results are obtained in proton-proton (pp) collisions ats=13TeVat the LHC, withΛc+baryons and charged (track-based) jets reconstructed in the transverse momentum intervals of3pTΛc+<15GeV/cand7pTjet ch<15GeV/c, respectively. Thezchdistribution is compared to a measurement ofD0-tagged charged jets inppcollisions as well as to 8 simulations. The data hints that the fragmentation of charm quarks into charm baryons is softer with respect to charm mesons, in the measured kinematic interval, as predicted by hadronization models which include color correlations beyond leading-color in the string formation.

    © 2024 CERN, for the ALICE Collaboration2024CERN 
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    Free, publicly-accessible full text available April 1, 2025
  4. Abstract

    A Large Ion Collider Experiment (ALICE) has been conceived and constructed as a heavy-ion experiment at the LHC. During LHC Runs 1 and 2, it has produced a wide range of physics results using all collision systems available at the LHC. In order to best exploit new physics opportunities opening up with the upgraded LHC and new detector technologies, the experiment has undergone a major upgrade during the LHC Long Shutdown 2 (2019–2022). This comprises the move to continuous readout, the complete overhaul of core detectors, as well as a new online event processing farm with a redesigned online-offline software framework. These improvements will allow to record Pb-Pb collisions at rates up to 50 kHz, while ensuring sensitivity for signals without a triggerable signature.

     
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    Free, publicly-accessible full text available May 1, 2025
  5. The first measurement of the cross section for incoherent photonuclear production ofJ/ψvector mesons as a function of the Mandelstam|t|variable is presented. The measurement was carried out with the ALICE detector at midrapidity,|y|<0.8, using ultraperipheral collisions of Pb nuclei at a center-of-mass energy per nucleon pair ofsNN=5.02TeV. This rapidity interval corresponds to a Bjorken-xrange(0.31.4)×103. Cross sections are given in five|t|intervals in the range0.04<|t|<1GeV2and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a|t|dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.

    © 2024 CERN, for the ALICE Collaboration2024CERN 
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    Free, publicly-accessible full text available April 1, 2025
  6. Free, publicly-accessible full text available March 1, 2025
  7. Free, publicly-accessible full text available February 1, 2025
  8. Free, publicly-accessible full text available February 1, 2025
  9. Abstract

    Luminosity determination within the ALICE experiment is based on the measurement, in van der Meer scans, of the cross sections for visible processes involving one or more detectors (visible cross sections). In 2015 and 2018, the Large Hadron Collider provided Pb–Pb collisions at a centre-of-mass energy per nucleon pair of √sNN= 5.02 TeV. Two visible cross sections, associated with particle detection in the Zero Degree Calorimeter (ZDC) and in the V0 detector, were measured in a van der Meer scan.This article describes the experimental set-up and the analysis procedure, and presents the measurement results. The analysis involves a comprehensive study of beam-related effects and an improved fitting procedure, compared to previous ALICE studies, for the extraction of the visible cross section. The resulting uncertainty of both the ZDC-based and the V0-based luminosity measurement for the full sample is 2.5%. The inelastic cross section for hadronic interactions in Pb–Pb collisions at √sNN= 5.02 TeV, obtained by efficiency correction of the V0-based visible cross section, was measured to be 7.67 ± 0.25 b, in agreement with predictions using the Glauber model.

     
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    Free, publicly-accessible full text available February 1, 2025
  10. The production of theψ(2S)charmonium state was measured with ALICE in Pb-Pb collisions atsNN=5.02TeV, in the dimuon decay channel. A significant signal was observed for the first time at LHC energies down to zero transverse momentum, at forward rapidity (2.5<y<4). The measurement of the ratio of the inclusive production cross sections of theψ(2S)andJ/ψresonances is reported as a function of the centrality of the collisions and of transverse momentum, in the regionpT<12GeV/c. The results are compared with the corresponding measurements inppcollisions, by forming the double ratio[σψ(2S)/σJ/ψ]PbPb/[σψ(2S)/σJ/ψ]pp. It is found that in Pb-Pb collisions theψ(2S)is suppressed by a factor of2with respect to theJ/ψ. Theψ(2S)nuclear modification factorRAAwas also obtained as a function of both centrality andpT. The results show that theψ(2S)resonance yield is strongly suppressed in Pb-Pb collisions, by a factor of up to3with respect topp. Comparisons of cross section ratios with previous Super Proton Synchrotron findings by the NA50 experiment and ofRAAwith higher-pTresults at LHC energy are also reported. These results and the corresponding comparisons with calculations of transport and statistical models address questions on the presence and properties of charmonium states in the quark-gluon plasma formed in nuclear collisions at the LHC.

    © 2024 CERN, for the ALICE Collaboration2024CERN 
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    Free, publicly-accessible full text available January 1, 2025