The energy densities reached in high-energy hadronic collisions at the LHC allow significant production of light (anti)nuclei. Their production yields have been measured as a function of $p_{\rm T}$ and charged-particle multiplicity in different collision systems and at different center-of-mass energies by ALICE. One of the most interesting results obtained from such a large variety of experimental data is that the dominant production mechanism of light (anti)nuclei seems to depend solely on the event charged-particle multiplicity. Evidence for this comes from the continuous evolution of the deuteron-to-proton and $^3$He-to-proton ratios with the event multiplicity across different collision systems and energies. The characterization of the light nuclei production mechanism is complemented by measurements of their production yields in jets and in the underlying event. In this paper, recent results on light nuclei production in small collision systems are shown and discussed in the context of the statistical hadronization and coalescence models. In addition, recent results on the deuteron production in jets and new preliminary results on its production in the underlying event measured in pp collisions at $\sqrt{s} = $ 13 TeV are discussed.
The measurement of (anti)nuclei production in pp, p-A and A-A collisions at ultrarelativistic energies is important to understand hadronization. The excellent tracking and particle identification capabilities of ALICE make it the most suited detector at the LHC to study light (anti)nuclei produced in high-energy hadronic collisions. (Anti)nuclei with mass numbers up to 4, such as (anti)deuterons, (anti)tritons, (anti)$^3$He and (anti)$^4$He have been successfully identified in ALICE at midrapidity ($|η|<$0.9). In this contribution, multiplicity dependent results on the yields, nuclei-to-proton…
The production mechanism of (anti)nuclei in ultrarelativistic hadronic collisions is under intense debate in the scientific community. The description of the experimental measurements is currently based on two competing phenomenological models: the statistical hadronization model and the coalescence approach. Light (anti)nuclei have been extensively measured in small collision systems, namely pp and p--Pb collisions, with ALICE at the LHC. Recent results on the (anti)deuteron production measured in jets and in the underlying event, and in high-multiplicity pp collisions at a center-of-mass ene…
Results from (anti-)(hyper-)nuclei production and searches for exotic bound states with ALICE at the LHC
利用时间投影室和飞行时间探测器，ALICE探测器具有出色的粒子识别能力，可以探测轻核和反核。此外，由内部跟踪系统提供的高跟踪分辨率使得能够将初级核与来自较重系统的衰变的那些分离。这允许重建衰变，如超介子弱衰变（$^3_Λ$ H $\rightarrow ^3$ He + $π^-$），$Λ$ n的假设束缚态衰变为氘和π，或H-双重子衰变为$Λ$，质子和$π^{-}$。综述了质子-质子、质子-铅、特别是铅-铅碰撞中稳定核和反核的产生。超核生产率在铅-铅也显示，连同上限估计的生产假设的外来候选人。结果进行了比较与预测的生产热（统计）和聚结模型。
Hadronic resonance production with the ALICE experiment in pp and Pb-Pb collisions at LHC energies
用ALICE实验测量了$\sqrt{s}=7$ TeV pp碰撞和$\sqrt{s_{_\mathrm{NN}}}=2.76$ TeV Pb-Pb碰撞中的强子共振$\mathrm{K}^{*}(892)^{0}$、$ϕ$（1020）和$Σ(1385)^{\pm}$。讨论了横动量谱、粒子比、核修正因子以及与模型预测的比较。此外，ALICE的结果进行了比较，在RHIC能源获得的数据。
Resonance measurements in pp and Pb--Pb collisions with the ALICE detector
pp碰撞中共振产生的研究有助于理解强子化机制和调整QCD激发的粒子产生模型。在铅-铅碰撞中，共振使人们能够探测火球的温度和时间演化。利用ALICE探测器收集的7 TeV pp碰撞数据分析了$\kstar$、$\phir$和$\xstar$共振的横动量谱。与Monte Carlo事件发生器的比较表明，介子谱的协议不同的水平，而$\xstar$总是被低估。
Measurements of jet production and jet properties in pp collisions provide a test of perturbative quantum chromodynamics (pQCD) and form a baseline for similar measurements in heavy ion (A--A) collisions. In this contribution, we report recent ALICE measurements of charged-particle jet production and intra-jet properties, including mean charged-constituent multiplicity and fragmentation distribution for leading jets, in minimum bias pp collisions at $\sqrt{s} = 13\,$TeV. In addition, the event multiplicity dependence of jet production and jet properties in pp collisions at $\sqrt{s} = 13\,$TeV…
We present the measurement of the charge-dependent 3-particle azimuthal correlation for unidentified charged particles in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV in ALICE. The results are compared with corresponding results from Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. We observe no significant difference in the charge-sensitive 3-particle correlator ($γ_{112}$) between the two collision energies. Charged-dependent mixed-harmonic correlator ($γ_{132}$) is also presented and compared with the predictions from a blast-wave model incorporating local charge conservation.
Recent results on the production of light nuclei, including deuterons, tritons, $^3$He, $^4$He and the corresponding antinuclei in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV are presented and compared with theoretical predictions to provide insight into their production mechanisms in heavy-ion collisions. The large variety of measurements performed with the ALICE apparatus at different energies and collision systems allows us to constrain the models of the production mechanisms of light flavour baryon clusters, in particular those based on the coalescence and statistical hadronisa…
Measurements of heavy-flavour production in p-Pb collisions with ALICE
用ALICE探测器研究了$\sqrt{s_\mathrm{NN}}=5.02$ TeV p-Pb碰撞中开放重味粒子的产生。使用了三个独立的观测量：中快度下D介子的强子衰变，以及中快度和前快度下重味强子到电子和μ子的半轻子衰变。本文报道了最新的开放魅力和美丽的核修正因子$R_\mathrm{pPb}$的ALICE测量结果，以及在p-Pb碰撞中D介子产生的中心性和多重性依赖性。
We present multiplicity and pseudorapidity distributions of inclusive photons at forward rapidity in proton-lead (p-Pb) collisions at $\sqrt{s\rm_{NN}}$ = 5.02 TeV using the data obtained from Photon Multiplicity Detector (PMD) of ALICE. The centrality dependence of pseudorapidity distributions of inclusive photons is also studied. Results are compared with the previous ALICE measurements of charged-particle production and with theoretical predictions from Monte Carlo models, DPMJET and HIJING.
The self-normalised $ψ(2S)$ yields as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 13 TeV and p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$= 8.16 TeV, using the ALICE detector at the CERN LHC, are reported in these proceedings. This measurement represents one of the main tools to understand the role of multiparton interactions and their influence on charmonium production in small systems, i.e pp and pA collisions. The ratio of $ψ(2S)$-over-J/$ψ$ as a function of charged-particle multiplicity is also presented for both pp and p--Pb collisions. The comparison to th…
The production of charm-hadrons at midrapidity in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV was recently measured by the ALICE Collaboration. The results show that the baryon-to-meson yield ratios differ from predictions where the hadronisation has been tuned to measurements obtained in $\rm e^{+}e^{-}$ and ep collisions for different charm-baryon species. These observations suggest that the charm fragmentation fractions are not universal and that the baryon-to-meson ratio depends on the collision systems. The results are compared to the predictions from Monte Carlo event generators and th…
Open heavy-flavour production in pp and p--Pb collisions with the ALICE experiment
重味强子产生的测量是研究超相对论性强子-强子碰撞产生的强相互作用和核物质性质的有力工具。ALICE实验出色的跟踪和顶点能力，以及它的粒子识别系统，允许有效地识别和重建包含重夸克的强子衰变。本文讨论了LHC Run-1阶段ALICE探测器收集的最近几次$\sqrt{s}=7$ TeV pp碰撞和$\sqrt{s_{NN}}=5.02$ TeV p-Pb碰撞的开放重味产生的测量结果。
In this paper, an overview of recent $\mathrm D^{0}$, $\mathrm D^{+}$ and $\mathrm D^{*+}$ measurements, performed by ALICE in proton--proton collisions at $\sqrt{s}~=~2.76$, 5, 7, 8 and 13 TeV, is reported. The minimum-bias production cross sections, as well as their energy and species dependences, are compared to perturbative QCD calculations. The evolution of the D-meson yields with the event multiplicity is compared to phenomenological models.
Measurements of electroweak-bosons in heavy-ion collisions with ALICE are reported. They are measured at large rapidities, via their (di)muonic decay: Z $\rightarrow μ^+ μ^-$ and W$^\pm \rightarrow μ^\pm ν$. The Z production and nuclear modification factor in Pb--Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 5.02 TeV are presented and compared to theoretical predictions with or without nuclear modifications of the Parton Distribution Functions. Measurements of electroweak-boson production in p--Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 5.02 and 8.16 TeV are also presented and discussed.
The multiplicity dependence of charmed-particle production can unveil new information on processes taking part at the parton level and on the interplay of soft and hard production mechanisms in collisions of relativistic hadrons. In this contribution, we report on multiplicity-differential measurements of $\rm{J}/ψ$ in pp and p-Pb collisions studied by the ALICE Collaboration. Comparisons between measurements at different energies are drawn as well as comparisons with $\rm{D}$ mesons. We also discuss the comparison with different theoretical predictions.
Heavy Flavour decay muon production at forward rapidity in pp collisions at \sqrt{s}= 7 TeV and in Pb-Pb collisions at \sqrt{s_{NN}}=2.76 TeV with the ALICE experiment
