Publication

Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII

2026

Abstract

The hyperon weak radiative decay Ξ 0 → γ Σ 0 is measured using a sample of Ξ 0 from $J/\psi \to {\Xi}^0{\overline{\Xi}}^0$ decays. The absolute branching fraction of Ξ 0 → γ Σ 0 is determined to be (3 . 66 ± 0 . 21 stat ± 0 . 10 syst ) × 10 − 3 , based on (10 . 087 ± 0 . 044) × 10 9 J/ψ events collected with the BESIII detector operating at the BEPCII collider. The decay asymmetry parameter is measured, with a complete angular analysis of the cascade decay chain, to be α γ = − 0 . 807 ± 0 . 095 stat ± 0 . 011 syst .

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2026

Abstract

Official source

Related concepts (32)

Xi baryon

The Xi baryons or cascade particles are a family of subatomic hadron particles which have the symbol Ξ and may have an electric charge (Q) of +2 e, +1 e, 0, or −1 e, where e is the elementary charge. Like all conventional baryons, Ξ particles contain three quarks. Ξ baryons, in particular, contain either one up or one down quark and two other, more massive quarks. The two more massive quarks are any two of strange, charm, or bottom (doubles allowed).

LHCb experiment

The LHCb (Large Hadron Collider beauty) experiment is a particle physics detector experiment collecting data at the Large Hadron Collider at CERN. LHCb is a specialized b-physics experiment, designed primarily to measure the parameters of CP violation in the interactions of b-hadrons (heavy particles containing a bottom quark). Such studies can help to explain the matter-antimatter asymmetry of the Universe. The detector is also able to perform measurements of production cross sections, exotic hadron spectroscopy, charm physics and electroweak physics in the forward region.

Baryon asymmetry

In physical cosmology, the baryon asymmetry problem, also known as the matter asymmetry problem or the matter–antimatter asymmetry problem, is the observed imbalance in baryonic matter (the type of matter experienced in everyday life) and antibaryonic matter in the observable universe. Neither the standard model of particle physics nor the theory of general relativity provides a known explanation for why this should be so, and it is a natural assumption that the universe is neutral with all conserved charges.

Related publications (32)

Measurement of the hyperon weak radiative decay Ξ0 → γΣ0 at BESIII

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