LHC sensitivity to lepton flavour violating Z boson decays

S. Davidson 1 S. Lacroix 2 P. Verdier 3
1 Theorie
IPNL - Institut de Physique Nucléaire 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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Journal articles
Journal of High Energy Physics, Institute of Physics (IOP), 2012, 9, pp.92. <10.1007/JHEP09(2012)092>


http://hal.in2p3.fr/in2p3-00719927
Contributor : Sylvie Florès <>
Submitted on : Monday, July 23, 2012 - 7:00:02 AM
Last modification on : Monday, October 13, 2014 - 3:00:43 PM

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

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