Results from (anti-)(hyper-)nuclei production and searches for exotic bound states with ALICE at the LHC

Abstract

The excellent particle identification capabilities of the ALICE detector, using the time projection chamber and the time-of-flight detector, allow the detection of light nuclei and anti-nuclei. Furthermore, the high tracking resolution provided by the inner tracking system enables the separation of primary nuclei from those coming from the decay of heavier systems. This allows for the reconstruction of decays such as the hypertriton mesonic weak decay (${}_{\Lambda }^3$H${\to }^3$He + ${\pi }^{-}$), the decay of a hypothetical bound state of a $\Lambda$n into a deuteron and pion or the H-dibaryon decaying into a $\Lambda$, a proton and a ${\pi }^{-}$. An overview of the production of stable nuclei and anti-nuclei in proton-proton, proton-lead and, in particular, lead-lead collisions is presented. Hypernuclei production rates in Pb--Pb are also shown, together with the upper limits estimated on the production of hypothetical exotica candidates. The results are compared with predictions for the production in thermal (statistical) and coalescence models.

4 pages, 7 figures, Quark Matter Conference at Kobe, Japan 2015 proceedings, submitted at Nuclear Physics A

References in corpus (5)

• Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at LHC energies
• ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\bar{\Lambda }}^3\overline{\mathrm{H}}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• SHAREv2: fluctuations and a comprehensive treatment of decay feed-down
• Precision measurement of the mass difference between light nuclei and anti-nuclei
• Search for weakly decaying $\overline{\Lambda \mathrm{n}}$ and $\Lambda \Lambda$ exotic bound states in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

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• Methods for separation of deuterons produced in the medium and in jets in high energy collisions