The first evidence for the decay $B^-\\rightarrow D^{**0}\\tau^-\\overline{\\nu_\\tau}$ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9 fb^ {-1}$, at centre-of-mass energies of 7, 8 and 13 Tev. Here, the $D^{**0}$ meson represents any of the three excited charm mesons $D_{1}(2420)^{0}$, $D_{1}(2420)^{0}$, and $D_{1}^{‚}(2400)^{0}$. The $B^-\\rightarrow D^{**0}\\tau^-\\overline{\\nu_{\\tau}}$ signal is measured with a significance of $3.5\\,\\sigma$, including systematic uncertainties. <\/p>\n
The combined branching fraction <\/p>\n
$BR(B^-\\rightarrow D^{**0}_{1,2}\\tau^-\\overline{\\nu_{\\tau}})\\times BR(D^{**0}_{1,2}\\rightarrow D^{*+}\\pi^-)$, where $D^{**0}_{1,2}$ denotes both $D_{1}(2420)^{0}$ and $D_{1}(2420)^{0}$ contributions, is measured to be<\/p>\n
$(0.051\\pm0.013(stat)\\pm 0.006(syst)\\pm 0.009(\\rm{ext}) )\\%$, where the last uncertainty reflects that of the branching fraction of the normalisation channel $B^-\\rightarrow D^{**0}_{1,2}D_s^{(*)-}$. <\/p>\n
The ratio between the tauonic and muonic semileptonic B decays, with the latter taken from world average values, is also determined and found to be ${\\cal R}(D^{**0}_{1,2})=0.13\\pm0.03(stat)\\pm0.01(syst)\\pm0.02\\,(\\rm{ext})$.<\/p>\n","protected":false},"excerpt":{"rendered":"
The first evidence for the decay $B^-\\rightarrow D^{**0}\\tau^-\\overline{\\nu_\\tau}$ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9 fb^ {-1}$, at centre-of-mass energies of 7, 8 and 13 Tev. Here, the $D^{**0}$ meson represents any of the three excited charm mesons $D_{1}(2420)^{0}$, $D_{1}(2420)^{0}$, and $D_{1}^{‚}(2400)^{0}$. The $B^-\\rightarrow D^{**0}\\tau^-\\overline{\\nu_{\\tau}}$ signal is measured with a significance of $3.5\\,\\sigma$, including systematic uncertainties. The combined branching […]<\/p>\n","protected":false},"author":12,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-32256","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\/32256","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\/32256\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=32256"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=32256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}