A Large Ion Collider Experiment

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ALICE INDICO

update on - 10:24:58

ALICE Calendar

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ALICE is optimized to study the collisions of nuclei at the ultra-relativistic energies provided by the LHC. The aim is to study the physics of strongly interacting matter at the highest energy densities reached so far in the laboratory. In such conditions, an extreme phase of matter - called the quark-gluon plasma - is formed. Our universe is thought to have been in such a primordial state for the first few millionths of a second after the Big Bang, before quarks and gluons were bound together to form protons and neutrons. Recreating this primordial state of matter in the laboratory and understanding how it evolves will allow us to shed light on questions about how matter is organized and the mechanisms that confine quarks and gluons. For this purpose, we are carrying out a comprehensive study of the hadrons, electrons, muons, and photons produced in the collisions of heavy nuclei (²⁰⁸Pb). ALICE is also studying proton-proton and proton-nucleus collisions both as a comparison with nucleus-nucleus collisions and in their own right. In 2021, ALICE completed a significant upgrade of its detectors to further enhance its capabilities and continue its scientific journey at the LHC in Run 3 and 4, until the end of 2032. At the same time, upgrade plans are being made for ALICE 3, the next-generation experiment for LHC Runs 5 and 6.

Recent highlights

CERN/ALICE-CIAE Joint Lab launched

On 28 January, the inaugural meeting of the CERN/ALICE - China Institute of Atomic Energy (CIAE) Joint Lab was held in Beijing Science and Technology Park. ....: Read more

Strangeness at its extremes

Strangeness production in high-energy hadron collisions is a powerful tool ....: Read more

ALICE welcomes its new management

ALICE enters 2026 with a newly appointed management team, led by Kai Schweda as Spokesperson, succeeding Marco van Leeuwen: Read more

Latest ALICE Submissions

Measurement of $π^0$-hadron correlations relative to the event plane in semicentral Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeVPer-trigger yields of $π^0$-hadron correlations were measured in semicentral Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV in ALICE at the LHC. The reconstructed $π^0 \rightarrow γγ$, with a transverse momentum of $11 < ~ p_{\rm T}(π^0) < ~ 14$ GeV/$c$, is used as the trigger particle to calculate yields of associated charged particles on the near- and away-side. The photons are reconstructed using the ALICE Electromagnetic Calorimeter, and the charged particles are measured in the ALICE central barrel within a pseudorapidity range of $\|η\| < ~0.8$. The yields are reported relative to the orientation of the $π^0$ with the $2^{\rm nd}$-order event plane, and are background subtracted using the reaction plane fit method. The data give an indication of a suppression of the associated charged-particle yields near $p_{\rm T} \approx 2$ GeV/$c$ when comparing out-of-plane to in-plane trigger particles. At associated charged-particle $p_{\rm T} > 3$ GeV/$c$, no significant event-plane dependence is observed within uncertainties. The results are compared with predictions from the JEWEL model, which implements jet energy loss in an expanding medium. JEWEL predicts no significant modification of either the near- or away-side associated yields, independent of whether medium recoils are included. The observed behavior may indicate the presence of additional energy-loss mechanisms beyond those governed by path-length dependence.	2602.22866
Measurement of the charged-particle-jet transverse-momentum fraction carried by prompt and non-prompt J/$ψ$ mesons in pp collisions at $\sqrt{s}=13$ TeVThe measurement of the transverse-momentum fraction ($z^{\rm ch}$) carried by prompt and non-prompt J/$ψ$ in charged-particle jets in proton--proton collisions with a center-of-mass energy $\sqrt{s}= 13$ TeV is reported by the ALICE Collaboration at the CERN Large Hadron Collider. The measurement is based on a Transition Radiation Detector triggered data sample corresponding to an integrated luminosity of $\mathcal{L} = 1.63\pm0.03$ pb$^{-1}$. Inclusive J/$ψ$ mesons with transverse momentum ($p_{\rm T}$) above 1 GeV/$c$ are reconstructed at midrapidity through the electron--positron decay channel. The prompt and non-prompt J/$ψ$ contributions are separated using the secondary vertices from beauty-hadron decays. Jets are reconstructed from J/$ψ$-meson candidates and charged particles using the anti-$k_{\rm T}$ algorithm with jet resolution parameter $R = 0.4$ in the pseudorapidity range $\|η_{\text{jet}}\| < ~ 0.5$. The distribution of the charged-particle jet $p_{\rm T}$ fraction carried by the prompt and non-prompt J/$ψ$ mesons, $z^{\rm ch}$, is measured in the range $0.3 < ~ z^{\rm ch} \leq 1.0$ for the jet-$ p_{\rm T}$ range $7 < ~ p_{\rm T}^{\rm jet} < ~ 15$ GeV/$c$. The measured $z^{\rm ch}$ distributions for prompt and non-prompt J/$ψ$ are compared to pQCD calculations and PYTHIA 8 simulations. Prompt and non-prompt J/$ψ$ production within charged-particle jets are found to be qualitatively well reproduced by PYTHIA 8 for $z^{\rm ch} < ~0.9$, however, as $z^{\rm ch}$ approaches one, the simulations overshoot the measured data, indicating an overestimation of the fraction of isolated J/$ψ$. This observed tension between data and simulations in the highest $z^{\rm ch}$ bins reflects the challenge of simulating hadronization of low-momentum jets.	2602.22889
Measurements of the production of W$^{\pm}$ and Z$^0$ bosons in pp collisions at $\sqrt{s} = 13$ TeVMeasurements of the production of the W$^{\pm}$ and Z$^0$ bosons at midrapidity in pp collisions at $\sqrt{s} = 13$ TeV with ALICE at the Large Hadron Collider (LHC) are presented. The W$^{\pm}$ and Z$^0$ bosons are detected via their (di)electronic decay channels, with the electron reconstruction performed in the midrapidity region ($\|y\| < ~ 0.6$). The $p_{\rm T}$-integrated and $p_{\rm T}$-differential production cross sections of electrons from W$^{\pm}$ decays in the interval $30 < ~ p_{\rm T} < ~ 60$ GeV/$c$, as well as the $p_{\rm T}$-integrated production cross section of Z$^0$ bosons, are measured. The results are described by perturbative QCD calculations using different sets of parton distribution functions. The production of W$^{\pm}$ bosons and azimuthally correlated associated hadrons is also measured as a function of the charged-particle multiplicity for the first time at the LHC. The former increases approximately linearly with the charged-particle multiplicity, while for the latter, there are hints of a faster-than-linear increase. These observations are compared with theoretical calculations.	2602.22898
Limits on the chiral magnetic effect from the event shape engineering and participant-spectator correlation techniques in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeVThe latest experimental studies related to the search for the Chiral Magnetic Effect (CME) in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded with the ALICE detector at the Large Hadron Collider (LHC) are presented. Charge-dependent two-particle correlations relative to the reaction plane are measured for charged particles in the pseudorapidity range $\|η\| < ~ 0.8$ and the transverse-momentum range $0.2 < ~ p_{\rm T} < ~ 5$ GeV/$c$. Two approaches have been employed: in the first method, the contribution of the background to the measurement is varied using the event shape engineering (ESE), while the second relies on changing the contribution of the potential CME signal by measuring azimuthal correlations relative to the participant plane, where the background contributions are maximized, and spectator plane, where the CME signal contribution is maximized. Both methods yield results consistent with the absence of a CME signal within the measurement uncertainties. The result obtained from correlations relative to different symmetry planes, a technique applied for the first time at LHC energies, gives the possibility to test independently and confirm the upper limits from previous measurements, while the new limit from the ESE analysis offers improved constraint relative to previous attempts.	2602.22900
Deuteron coalescence probability in jets in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeVThis article presents the first measurement of the (anti)deuteron and antiproton transverse-momentum distributions, the deuteron coalescence parameter, and the ratio between the yields of deuteron and proton in and out of jets in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. Three regions are used to study the jet-correlated production: Toward, Away, and Transverse to the jet axis, which direction is approximated by the leading particle in the event with $p_{\rm T}^{\rm lead} > 5$ GeV/$c$. The jet contribution is obtained from the Toward region by subtracting the underlying event, which dominates the Transverse region. In p-Pb collisions, an enhancement of the coalescence parameter $B_{\rm 2}$ is observed in jets compared to the underlying event. The enhancement is larger than the one observed in a similar analysis already in pp collisions. The results are compared with predictions from PYTHIA 8.314 using the Angantyr model with a deuteron production model based on ordinary nuclear reactions. The model is able to qualitatively reproduce the large enhancement of the coalescence parameter in jets with respect to the out-of-jets one. The results are further compared in detail with similar ones from previous studies for pp collisions at $\sqrt{s} = 13$ TeV.	2602.22880

See all submissions...

Upcoming Conferences (Next Week)

XXXIX Rencontres de Physique de la Vallée d'Aoste La Thuille

Lake Louise Winter Institute 2026

Physics Days 2026 - annual gathering of Finnish Physical Society

See all conferences...

Jobs info

Job - Postdoc in Silicon Detector R&D – University of Liverpool (19-02-2026 )

ALICE Job - Postdoctoral Position – ALICE Finnish Team (FoCal & Jet Analysis) (12-02-2026 )

ALICE Job - Postdoctoral position in high-energy nuclear physics at the University of California, Berkeley (10-02-2026 )

Diversity and Inclusivity in ALICE

The ALICE Collaboration embraces and values the diversity of its team members and colleagues. We are committed to fostering an inclusive environment for all people regardless of their nationality/culture, profession, age/generation, family situation and gender, as well as individual differences such as but not limited to ethnic origin, sexual orientation, belief, disability, or opinions provided that they are consistent with the Organization’s values.