LHC sensitivity to lepton flavour violating Z boson decays
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- Davidson, S., Lacroix, S. & Verdier, P. J. High Energ. Phys. (2012) 2012: 92. doi:10.1007/JHEP09(2012)092
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We estimate that the LHC could set bounds BR(Z → μ±e∓) < 4.1 × 10−7 and BR(Z → τ±μ∓) < 3.5 × 10−6 (at 95% C.L.) with 20 fb−1 of data at 8 TeV. A similar sensitivity can be anticipated for Z → τ±e∓, because we consider leptonic τ decays such that Z → τ±μ∓ → e±μ∓ + invisible. These limits can be compared to the LEP1 bounds of order 10−5 → 10−6. Such collider searches are sensitive to a flavour-changing effective Z coupling which is energy dependent, so are complementary to bounds obtained from \( \tau \to \ell \overline \ell \ell \) and \( \mu \to e\overline e e \).