Being forbidden in the Standard Model (SM) of particle physics, lepton
flavour violating (LFV) decays are among the most powerful probes to
search for physics beyond the SM. In view of the recent anomalies seen
by LHCb on tests of lepton flavor universality in b→sll and b→clν
processes, the interest in τ LFV decays has been greatly reinforced: in
particular, several new physics models predict branching fractions just
below the current experimental limits. The Belle II experiment located
at KEK, Japan, started to take data in 2019. Thanks to its clean
environment and high τ+τ− cross section, it provides an ideal
environment to study the τ→lФ decay, a very promising channel with
regard to leptoquark searches. Such an analysis relies heavily on an
effective background suppression strategy that we present here, with a
first look at data and simulation comparison using control channels.
