Speaker
Md. Rihan Haque
(NISER, Bhubaneswar(IN))
Description
A strongly interacting medium, namely Quark Gluon Plasma (QGP), is formed in high-energy heavy-ion collisions at RHIC. Light nuclei (anti-nuclei) can be produced in such heavy-ion collisions by the recombination of produced nucleons (anti-nucleons) or stopped nucleons. This formation process is called final-state coalescence. The production of light nuclei is dependent on the baryon density and the correlation (freeze-out) volume. Therefore, by studying the yield and azimuthal anisotropy of light nuclei (anti-nuclei) and comparing them with that of proton (anti-proton) we can gain insight in the particle production mechanism via coalescence and physical properties of the expanding system at the thermal (kinetic) freeze-out. Unlike the quark coalescence phenomena of identified hadrons, nucleonic coalescence is directly measurable as both the light nuclei and nucleons (proton and anti-proton) are measured by the detectors in a given experiment.
In this presentation, we will show the invariant yields of $d$ and $\overline{d}$ for Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV from the STAR experiment at RHIC. Light nuclei are identified using the Time Projection Chamber (TPC) and Time-of-Flight (TOF) detector of the STAR experiment. The TOF detector enhances the identification of the light nuclei and extends the $p_{T}$ reach of light nuclei beyond 1 GeV/c. The $p_{T}$ spectra of nuclei will be compared with p $(\overline{p})$ to obtain the nuclei to nucleon ratio and $B_{2}$ parameter to understand the light nucleus production mechanism in heavy-ion collisions. Light nucleus spectra will also be compared with the prediction from Blast-wave model, using the fit parameters obtained from Blast-wave fit of $\pi$, K, p spectra.
Authors
Md. Rihan Haque
(NISER, Bhubaneswar(IN))
for the STAR Collaboration
