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LHC sensitivity to lepton flavour violating Z boson decays

Sacha Davidson 1 S. Lacroix 2 P. Verdier 3
1 Théorie
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
3 D0
IPNL - Institut de Physique Nucléaire de Lyon
Abstract : We estimate that the LHC could set bounds $BR(Z\to \mu^\pm e^\mp) < 4.1\times 10^{-7}$ and $BR(Z \to \tau^\pm \mu^\mp)< 3.5\times 10^{-6}$ (at 95% C.L.) with 20 fb$^{-1}$ of data at 8 TeV. A similar sensitivity can be anticipated for $Z\to \tau^\pm e^\mp$, because we consider leptonic $\tau$ decays such that $Z\to \tau^+ \mu^- \to e^+ \mu^- +$ invisible. These limits can be compared to the LEP1 bounds of order $10^{-5} \to 10^{-6}$. Such collider searches are sensitive to a flavour-changing effective $Z$ coupling which is energy dependent, so are complementary to bounds obtained from $\tau \to 3 \mu$ and $\mu \to 3e$.
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Submitted on : Monday, July 23, 2012 - 7:02:59 AM
Last modification on : Friday, September 10, 2021 - 1:50:22 PM

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Sacha Davidson, S. Lacroix, P. Verdier. LHC sensitivity to lepton flavour violating Z boson decays. Journal of High Energy Physics, Springer, 2012, 9, pp.92. ⟨10.1007/JHEP09(2012)092⟩. ⟨in2p3-00719927⟩



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