{"id":32231,"date":"2026-01-21T17:01:31","date_gmt":"2026-01-21T17:01:31","guid":{"rendered":"https:\/\/lamarr-institute.org\/publication\/first-observation-of-the-lambda_b0rightarrowlambda_cd_s-kk-decay-and-search-for-pentaquarks-in-the-lambda_cd_s-system\/"},"modified":"2026-09-17T11:22:01","modified_gmt":"2026-09-17T11:22:01","slug":"first-observation-of-the-lambda_b0rightarrowlambda_cd_s-kk-decay-and-search-for-pentaquarks-in-the-lambda_cd_s-system","status":"publish","type":"publication","link":"https:\/\/lamarr-institute.org\/de\/publication\/first-observation-of-the-lambda_b0rightarrowlambda_cd_s-kk-decay-and-search-for-pentaquarks-in-the-lambda_cd_s-system\/","title":{"rendered":"First observation of the $\\Lambda_b^{0}\\!\\rightarrow\\Lambda_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay and search for pentaquarks in the $\\Lambda_{c}^{+}D_{s}^{-}$ system"},"content":{"rendered":"<p>The $\\Lambda_b^{0}\\!\\rightarrow\\Lambda_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb $^{-1}$. The ratio of branching fraction to that of $\\Lambda_b^{0} \\!\\rightarrow\\Lambda_{c}^{+}D_{s}^{-}$ decays is measured as $0.0141 \\pm 0.0019 \\pm 0.0012$, where the first uncertainty is statistical and the second systematic. A search for hidden-charm pentaquarks with strangeness is performed in the $\\Lambda_{c}^{+}D_{s}^{-}$ system. No evidence is found, and upper limits on the production ratio of $P_{c\\bar{c}s}(4338)^0$ and $P_{c\\bar{c}s}(4459)^0$ pentaquarks relative to the $\\Lambda_{c}^{+}D_{s}^{-}$ final state are set at the 95\\% confidence level as 0.12 and 0.20, respectively.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The $\\Lambda_b^{0}\\!\\rightarrow\\Lambda_{c}^{+}D_{s}^{-}K^{+}K^{-}$ decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 6 fb $^{-1}$. The ratio of branching fraction to that of $\\Lambda_b^{0} \\!\\rightarrow\\Lambda_{c}^{+}D_{s}^{-}$ decays is measured as $0.0141 \\pm 0.0019 \\pm 0.0012$, where the first uncertainty is statistical and the second systematic. A search for hidden-charm [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-32231","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\/32231","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\/14"}],"version-history":[{"count":0,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/32231\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=32231"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=32231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}