CERN Accelerating science

TPb-Pb collision data taken by ALICE during 2018 at a centre-of-mass energy per nucleon pair of 5.02 TeV. The selection of (anti)hypernuclei exploits the displaced decay vertex topology of the particles originating from weak decays. Signals of antihyperhydrogen-4 (a bound of an antiproton, two antineutrons, and a ¯Λ) and antihyperhelium-4 (a bound of two antiprotons, an antineutron, and a ¯Λ) are selected with a machine learning technique, which provides a significant improvement in the discrimination between signal and background compared to standard selection techniques. Antihyperhydrogen-4 is reconstructed through its charged mesonic two-body decay into an (anti)4He and a charged pion, while antihyperhelium-4 is reconstructed via its charged mesonic three-body decay into an (anti)3He, an (anti)proton, and a charged pion. The illustration shows the constituents of antihyperhelium-4.

Photograph: Ditzel, Janik
Keywords: ALICE; Event; ALICE General

Note: General Photo

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