{"id":35143,"date":"2026-04-13T14:10:33","date_gmt":"2026-04-13T14:10:33","guid":{"rendered":"https:\/\/lamarr-institute.org\/publication\/observation-of-the-rare-baryonic-decay-brightarrow-p-baritlambda-and-measurement-of-its-weak-decay-parameter\/"},"modified":"2026-06-08T13:17:51","modified_gmt":"2026-06-08T13:17:51","slug":"observation-of-the-rare-baryonic-decay-brightarrow-p-baritlambda-and-measurement-of-its-weak-decay-parameter","status":"publish","type":"publication","link":"https:\/\/lamarr-institute.org\/de\/publication\/observation-of-the-rare-baryonic-decay-brightarrow-p-baritlambda-and-measurement-of-its-weak-decay-parameter\/","title":{"rendered":"Observation of the rare baryonic decay $B^{+}\\rightarrow p \\bar{\\it\\Lambda}$ and measurement of its weak decay parameter"},"content":{"rendered":"<p>The first observation of the decay $B^{+}\\rightarrow p \\bar{\\it{\\Lambda}}$ is presented, using proton-proton collision data collected by the LHCb experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb $^{-1}$. The signal significance exceeds seven standard deviations. Using the $B^{+} \\rightarrow K^{\\mathrm{0}}_{\\mathrm{S}} \\pi^{+}$ decay as a normalization channel, the branching fraction is measured and combined with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012, yielding $B(B^{+}\\rightarrow p \\bar{\\it{\\Lambda}})=(1.24\\pm 0.17\\pm 0.05\\pm 0.03)\\times 10^{-7}$, where the first uncertainty is statistical, the second is systematic, and the third comes from the uncertainty on the branching fraction of the normalization channel. The $B^{+}\\rightarrow p \\bar{\\it{\\Lambda}}$ weak decay parameter is measured to be $\\alpha_B = 0.87_{-0.29}^{+0.26} \\pm 0.09$, indicating the presence of comparable S-wave and P-wave decay amplitudes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The first observation of the decay $B^{+}\\rightarrow p \\bar{\\it{\\Lambda}}$ is presented, using proton-proton collision data collected by the LHCb experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb $^{-1}$. The signal significance exceeds seven standard deviations. Using the $B^{+} \\rightarrow K^{\\mathrm{0}}_{\\mathrm{S}} \\pi^{+}$ decay as a normalization channel, the branching fraction is measured and combined with previous LHCb results based [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-35143","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\/35143","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\/35143\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=35143"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=35143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}