Abstract

Measurements of the production of light (anti-)nuclei and (anti-)hypernuclei have been performed in different colliding systems, namely pp, p–Pb and Pb–Pb. The results of the production in Pb–Pb collisions of light (anti-)(hyper-)nuclei follows the expectation of thermal models, whereas the production of nuclei in p–Pb collisions tends to closer follow the expectations from coalescence models. Both models can give predictions for the production of hypothetical states such as bound states of two Λ hyperons or of a Λ and a neutron, which are expected to decay weakly. These states are searched for and no signal is found, thus upper limits, which are significantly below the model expectations, are set. Further, the most recent measurement of the lifetime of the hypertriton determined in Pb–Pb collisions at sNN=5.02 TeV at the LHC gives a value exactly between the expectations of the most recent theoretical calculation and the world average. In addition, the new result is in agreement with other recent measurements in heavy-ion collisions.

Highlights

  • The ALICE (A Large Ion Collider Experiment) Collaboration has, among others, a program to investigate many different kinds ofbaryon states predicted by QCD and QCD inspired models [1]

  • The results of the production in Pb–Pb collisions of light(hyper-)nuclei follows the expectation of thermal models, whereas the production of nuclei in p–Pb collisions tends to closer follow the expectations from coalescence models

  • The aim is to understand the production mechanisms acting in these collisions, resulting in large production yields fornuclei andhypernuclei

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Summary

Introduction

The ALICE (A Large Ion Collider Experiment) Collaboration has, among others, a program to investigate many different kinds of (multi-)baryon states predicted by QCD and QCD inspired models [1]. The penalty factor for adding a baryon to the system is about 300 in Pb–Pb and around 600 in p-Pb, which means the suppression when going from d to 3He is 300 in Pb–Pb and 600 in p–Pb. Figure 6 displays the production yield of different light flavour particle species compared together with three different thermal model fits from three different model implementations. 10T-4h0e%mceeansutrraeldPtbra–nPsbveervseentms oamt e√nstNuNm spectrum of the hypertriton (red = 5.02 TeV are shown, points) and anti-hypertriton (blue points) together with blast-wave functions based on the measurement of light nuclei.

Results
Conclusion

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