A search for the rare decay $B^{+} \\to \\bar \\Lambda p \\mu^{+} \\mu^{-}$ is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of $\\sqrt{s}$= 13 TeV, corresponding to an integrated luminosity of 5.4 fb $^{-1}$. An excess of events is found with respect to the background-only expectation, with a signal significance of 3.5 standard deviations, in the low invariant-mass region of $m(\\bar \\Lambda p)<2.8$ GeV\/$c^2$. The branching fraction is measured to be ${\\cal B}_{\\rm low}({B^{+}}\\to {\\bar \\Lambda p \\mu^{+} \\mu^{-}})=\\left(1.70 ^{+0.65}_{-0.56}(\\rm stat) \\pm 0.17(\\rm syst) \\pm 0.14(\\rm ext)\\right) \\times 10^{-8}$, where the last uncertainty is due to external inputs on ${\\cal B}(B^+\\to{J\/\\psi \\bar \\Lambda p})\\times {\\cal B}({J\/\\psi}\\to{\\mu^+\\mu^-}$). With no significant signal observed in the high $m(\\bar \\Lambda p)$ region above 2.8 GeV\/ $c^2$, an upper limit is set to be ${\\cal B}_{\\rm high}(B^{+}\\to {\\bar \\Lambda p \\mu^{+} \\mu^{-}})<2.8\\,(3.7) \\times 10^{-9}$ at the 90\\% (95\\%) confidence level.\n<\/p>\n","protected":false},"excerpt":{"rendered":"
A search for the rare decay $B^{+} \\to \\bar \\Lambda p \\mu^{+} \\mu^{-}$ is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of $\\sqrt{s}$= 13 TeV, corresponding to an integrated luminosity of 5.4 fb $^{-1}$. An excess of events is found with respect to the background-only expectation, with a signal significance of 3.5 standard deviations, in the low invariant-mass region of $m(\\bar \\Lambda p)<\/p>\n","protected":false},"author":14,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-40921","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\/40921","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\/40921\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=40921"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=40921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}