ALICE

This Letter presents systematic measurements of various flow observables using charged particles from Xe$-$Xe collisions at $\sqrt{s_{_{\mathrm{NN}}}}~=~5.44$~TeV and Pb$-$Pb collisions at $\sqrt{s_{_{\mathrm{NN}}}}~=~5.02$~TeV recorded by the ALICE detector. Flow coefficients, flow fluctuations, nonlinear flow modes, and correlations between flow coefficients are measured as a function of centrality [...]

Details of the nuclear structure of $^{129}$Xe, such as the quadrupole deformation and the nuclear diffuseness, are studied by extensive measurements of anisotropic-flow-related observables in Xe–Xe collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{NN}}$ = 5.44 TeV with the ALICE detector at the LHC. The results are compared with those from Pb–Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV for a baseline, given that the $^{208}$Pb nucleus exhibits a very weak deformation. [...]

No data abstract available..

The first measurement of prompt D$^{*+}$-meson spin alignment in ultrarelativistic heavy-ion collisions with respect to the direction orthogonal to the reaction plane is presented. The spin alignment is quantified by measuring the element ρ$_{00}$ of the diagonal spin-density matrix for prompt D$^{*+}$ mesons with 4 < p$_{T}$< 30 GeV/c in two rapidity intervals, |y|< 0.3 and 0.3 < |y|< 0.8, in central (0–10%) and midcentral (30–50%) Pb–Pb collisions at $\sqrt{{s}_{\text{NN}}}={5}.0{2}$ TeV. [...]

We present the measurement of the $p_{\rm T}$-differential production cross section of $\omega$ mesons in pp and p--Pb collisions at $\sqrt{s_{\text{\tiny NN}}}=5.02$ TeV at midrapidity by ALICE. In addition, the first measurement of the nuclear modification factor $R_{\text{pPb}}$ for $\omega$ mesons at LHC energies is presented, complementing the existing measurements of lighter neutral mesons such as the $\pi^0$ and $\eta$. [...]

We present the measurement of the p$_T$-differential production cross section of ω mesons in pp and p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV at midrapidity by ALICE. In addition, the first measurement of the nuclear modification factor R$_{pPb}$ for ω mesons at LHC energies is presented, complementing the existing measurements of lighter neutral mesons such as the π$^0$ and η. [...]

No data abstract available..

Ultrarelativistic heavy-ion collisions produce a state of hot and dense strongly interacting QCD matter called quark-gluon plasma (QGP). On an event-by-event basis, the volume of the QGP in ultracentral collisions is mostly constant, while its total entropy can vary significantly due to quantum fluctuations, leading to variations in the temperature of the system. [...]

No data abstract available..

The first measurement of the e$^+$e$^−$ pair production at midrapidity and low invariant mass in central Pb-Pb collisions at $\sqrt{s_{NN}}$=5.02TeV at the Large Hadron Collider is presented. The yield of e$^+$e$^−$ pairs is compared with a cocktail of expected hadronic decay contributions in the invariant mass (m$_{ee}$) and pair transverse momentum ($p_{T,ee}$) ranges m$_{ee}$ < 3.5 GeV/c$^2$ and p$_{T,ee}$ <8 GeV/c. [...]