Light (anti-)nuclei production and flow in relativistic heavy-ion collisions

Using the coalescence model based on the phase-space distributions of protons, neutrons, $\mathrm{\Lambda }\mathrm{s}$, and their antiparticles from a multiphase transport (AMPT) model, we study the production of light nuclei ($\mathrm{H}$, $\mathrm{H}$, $\mathrm{He}$, $\mathrm{H}$) and their antinuclei in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV. The resulting transverse momentum spectra, elliptic flows, and coalescence parameters for these nuclei are presented and compared with available experimental data. We also show the constituent number scaled elliptic flows of these nuclei and discuss its implications.

Figure 1

Transverse momentum spectra of $N$-like (solid line), $\mathrm{\Lambda }$-like (dashed line), and ${}^2\mathrm{H}$-like (dash-dotted line), ${}^3\mathrm{H}$-like (filled triangles), ${}_{\mathrm{\Lambda }}{}^3\mathrm{H}$-like (open triangles) at midrapidity $\left|y\right|\le 0.5$ from the default (left panel) and the string melting (right panel) AMPT model for Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and impact parameter $b=8$ fm. Data for protons (open diamonds) and deuterons (open squares) are from the ALICE Collaboration [1, 2].

Figure 2

Elliptic flows of $N$-like (solid line), $\mathrm{\Lambda }$-like (dashed line), ${}^2\mathrm{H}$-like (dash-dotted line), ${}^3\mathrm{H}$-like (filled triangles), and ${}_{\mathrm{\Lambda }}{}^3\mathrm{H}$-like (open triangles) at midrapidity $\left|y\right|\le 0.5$ from the default (left panel) and the string melting (right panel) AMPT model for Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and impact parameter $b=8$ fm.

Figure 3

Constituent number scaled elliptic flows of $N$-like (solid line), $\mathrm{\Lambda }$-like (dashed line), ${}^2\mathrm{H}$-like (dash-dotted line), ${}^3\mathrm{H}$-like (filled triangles), and ${}_{\mathrm{\Lambda }}{}^3\mathrm{H}$-like (open triangles) at midrapidity $\left|y\right|\le 0.5$ from the default (left panel) and the string melting (right panel) AMPT model for Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV and impact parameter $b=8$ fm.

Figure 4

Coalescence parameters for ${}^2\mathrm{H}$-like (solid line), ${}^3\mathrm{H}$-like (dashed line), and ${}_{\mathrm{\Lambda }}{}^3\mathrm{H}$-like (dash-dotted line) at midrapidity $\left|y\right|\le 0.5$ from the default (left panel) and the string melting (right panel) AMPT model for Pb+Pb collisions at $\sqrt{s_{NN}}=2.76\mathrm{TeV}$ and impact parameter $b=8$ fm. Data for $B_2$ (open squares) and $B_3$ (open circles) are from the ALICE Collaboration [1, 2].