Observation of the antimatter hypernucleus <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41586_2024_7823_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="34" /> </InlineMediaObject> <EquationSource Format="TEX">$${}_{\bar{{\boldsymbol{\Lambda }}}}{}^{{\bf{4}}}\bar{{\bf{H}}}$$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mover accent="true"> <mi mathvariant="bold">H</mi> <mo>¯</mo> </mover> <none /> <none /> <mprescripts /> <mover accent="true"> <mi mathvariant="bold">Λ</mi> <mo>¯</mo> </mover> <mn mathvariant="bold">4</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>