{"id":32252,"date":"2026-01-21T17:01:33","date_gmt":"2026-01-21T17:01:33","guid":{"rendered":"https:\/\/lamarr-institute.org\/publication\/observation-of-the-varlambda-0_b-rightarrow-j-psi-varxi-k-and-varxi-0_b-rightarrow-j-psi-varxi-pi-decays\/"},"modified":"2026-06-08T13:18:53","modified_gmt":"2026-06-08T13:18:53","slug":"observation-of-the-varlambda-0_b-rightarrow-j-psi-varxi-k-and-varxi-0_b-rightarrow-j-psi-varxi-pi-decays","status":"publish","type":"publication","link":"https:\/\/lamarr-institute.org\/de\/publication\/observation-of-the-varlambda-0_b-rightarrow-j-psi-varxi-k-and-varxi-0_b-rightarrow-j-psi-varxi-pi-decays\/","title":{"rendered":"Observation of the ${{{\\varLambda } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{K} ^+} }$ and ${{{{\\varXi } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{\\pi } ^+} }}$ decays"},"content":{"rendered":"<p>The first observation of the ${{{{\\varXi } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{\\pi } ^+} }}$ decay and the most precise measurement of the branching fraction of the ${{{\\varLambda } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{K} ^+} }$ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016\u20132018 at a centre-of-mass energy of 13 $\\text {\\,TeV}$, corresponding to an integrated luminosity of 5.4 $\\text {\\,fb} ^{-1}$. Using the ${{{{\\varLambda } ^0_{b}} \\!\\rightarrow {{J \\psi }} {\\varLambda } }}$ and ${{{{\\varXi } ^-_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} }}$ decays as normalisation channels, the ratios of branching fractions are measured to be $\\begin{aligned} {\\frac{{{\\mathcal {B}}}({{{\\varLambda } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{K} ^+} })}{{{\\mathcal {B}}}({{{{\\varLambda } ^0_{b}} \\!\\rightarrow {{J \\psi }} {\\varLambda } }})}}&#038;= (1.17 \\pm 0.14 \\pm 0.08)\\times 10^{-2} \\, ,\\ {\\frac{{{\\mathcal {B}}}({{{{\\varXi } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{\\pi } ^+} }})}{{{\\mathcal {B}}}({{{{\\varXi } ^-_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} }})}}&#038;= (11.9 \\pm 1.4 \\pm 0.6)\\times 10^{-2}\\, , \\end{aligned}$, where the first uncertainty is statistical and the second systematic.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The first observation of the ${{{{\\varXi } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{\\pi } ^+} }}$ decay and the most precise measurement of the branching fraction of the ${{{\\varLambda } ^0_{b}} \\!\\rightarrow {{J \\psi }} {{\\varXi } ^-} {{K} ^+} }$ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016\u20132018 at a centre-of-mass energy of 13 $\\text {\\,TeV}$, corresponding to an integrated [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-32252","publication","type-publication","status-publish","hentry","publication-type-article"],"acf":[],"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/32252","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/types\/publication"}],"author":[{"embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/users\/12"}],"version-history":[{"count":0,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/32252\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=32252"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=32252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}