# Effect of Lepton Flavor Universality (LFU) on Lepton Flavor Violation (LFV)

Does the search for Lepton Flavor Violation (LFV) get affected in any possible way when Lepton Flavor Universality (LFU) is used for background estimation?

More specifically, because tau's show some inefficiency during identification, it is possible to simulate tau using a muon's kinematics (muons can identified with good efficiency in detectors) under the assumption of LFU. So, I am wondering if a background simulated in such a way would effect the search for a signal of LFV, which involves a tau in the final state.

EDIT - Latest results from LHCb show 2.5$$\sigma$$ deviation from standard model LFU.

• I think think that this question can only be answered by the group providing the data, i.e. the tau identification, if that is what is worrying you. – anna v Mar 27 at 10:04