${\Lambda }_c$ Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 200 GeV measured by the STAR experiment

Abstract

At RHIC, enhancements in the baryon-to-meson ratio for light hadrons and hadrons containing strange quarks have been observed in central heavy-ion collisions compared to those in p+p and peripheral heavy-ion collisions in the intermediate transverse momentum ($p_T$) range (2 $<$ $p_T$ $<$ 6 GeV/$c$). This can be explained by the hadronization mechanism involving multi-parton coalescence. ${\Lambda }_c$ is the lightest charmed baryon with mass close to that of $D^0$ meson, and has an extremely short life time (c$\tau$$\sim$60 $\mu$m). Different models predict different magnitudes of enhancement in the ${\Lambda }_c$/$D^0$ ratio depending on the degree to which charm quarks are thermalized in the medium and how the coalescence mechanism is implemented. In these proceedings, we report the first measurement of ${\Lambda }_c$ production in heavy-ion collisions using the Heavy Flavor Tracker at STAR. The invariant yield of ${\Lambda }_c$ for 3 $<$ $p_T$ $<$ 6 GeV/$c$ is measured in 10-60% central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The ${\Lambda }_c$/$D^0$ ratio is compared to different model calculations, and the physics implications are discussed.

XXVIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions\\ (Quark Matter 2017)

References in corpus (2)

• Heavy Flavor Hadrons in Statistical Hadronization of Strangeness-rich QGP
• Charmonium and open charm production in nuclear collisions at SPS/FAIR energies and the possible influence of a hot hadronic medium

Cited by in corpus (6)

• Charmed Hadrons from Coalescence plus Fragmentation in relativistic nucleus-nucleus collisions at RHIC and LHC
• ${\Lambda }_{\mathrm{c}}^{+}$ production in pp collisions at $\sqrt{s}=7$ TeV and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• ${\Lambda }_{\mathrm{c}}^{+}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Charmed hadron production in an improved quark coalescence model
• Non-strange and strange D-meson and charm-baryon production in heavy-ion collisions measured with ALICE at the LHC
• Charmed meson and baryon measurements in pp and p-Pb collisions with ALICE at the LHC