Search for B<SUP>0</SUP> → K<SUP>*0</SUP>τ<SUP>+</SUP>τ<SUP>-</SUP> Decays at the Belle II Experiment
Açıklama
We present a search for the rare flavor-changing neutral-current decay B-0 -> K-*0 tau(+)tau(-) with data collected by the Belle II experiment at the SuperKEKB electron-positron collider. The analysis uses a 365 fb(-1) data sample recorded at the center-of-mass energy of the (sic)(4S) resonance. One of the B mesons produced in the (sic)(4S) -> B-0(B) over bar (0) process is fully reconstructed in a hadronic decay mode, while its companion B meson is required to decay into a K*(0) and two t leptons of opposite charge. The t leptons are reconstructed in final states with a single electron, muon, charged pion or charged. meson, and additional neutrinos. We set an upper limit on the branching fraction of B(B-0 -> K-*0 tau(+)tau(-)) < 1.8 x 10(-3) at the 90% confidence level, which is the most stringent constraint reported to date.
Dosyalar
bib-441a1d61-3803-41b7-987b-c3c8be843e42.txt
Dosyalar
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