Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara
| Summary:
We present a search for the baryon number $B$ and lepton number $L$ violating
decays $tau^- rightarrow Lambda pi^-$ and $tau^- rightarrow bar{Lambda}
pi^-$ produced from the $e^+e^-to tau^+tau^-$ process, using a 364
fb$^{-1}$ data sample collected by the Belle~II experiment at the SuperKEKB
collider. No evidence of signal is found in either decay mode, which have
$|Delta(B-L)|$ equal to $2$ and $0$, respectively. Upper limits at 90%
credibility level on the branching fractions of $tau^- rightarrow
Lambdapi^-$ and $tau^- rightarrow bar{Lambda}pi^-$ are determined to be
$4.7 times 10^{-8}$ and $4.3 times 10^{-8}$, respectively.
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