May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Measurement of Lambda_cbar-/Lambda_c+ Ratio in Au+Au Collisions at √sNN = 200 GeV with the STAR Experiment

May 15, 2018, 5:00 PM
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Open heavy flavour Poster Session


Miroslav Simko (Nuclear Physics Institute of the Czech Academy of Sciences (cz))


The yield ratios of strange anti-baryons to baryons have been measured in heavy-ion collisions and exhibit a trend that is getting closer to unity with increasing number of valence strange quarks. This ratio has, however, never been measured for charm baryons, and it will be important to establish if they exhibit a similar amount of baryon-to-anti-baryon enhancement as strange baryons. $\Lambda_\mathrm{c}$ is the lightest baryon containing a charm quark and, as such, presents a unique probe to study the hadronization of charm quarks in the hot and dense QCD medium created in ultra-relativistic heavy-ion collisions. $\Lambda_\mathrm{c}$ has, however, an extremely short lifetime ($c \tau \sim 60\,\mu$m) which makes the reconstruction experimentally challenging. The Heavy Flavor Tracker, installed at the STAR experiment between the years 2014-2016, has shown a high efficiency and an unparalleled track-pointing resolution that facilitates the $\Lambda_\mathrm{c}$ reconstruction in heavy-ion collisions. In this poster, we will present the reconstruction of $\Lambda_\mathrm{c}$ baryons via hadronic decays and the measurement of the yield ratio of $\overline{\Lambda_\mathrm{c}}^-/\Lambda_\mathrm{c}^+$, utilizing the high-statistics data samples of Au+Au collisions at $\sqrt{s_\mathrm{NN}} = 200\,$GeV, recorded with the STAR experiment in 2014 and 2016.

Collaboration STAR
Content type Experiment
Centralised submission by Collaboration Presenter name already specified

Primary author

Zhenyu Ye (University of Illinois at Chicago)

Presentation materials