Search for Tau Flavour Violation at the LHC

Details Search for Tau Flavour Violation at the LHC Search for Tau Flavour Violation at the LHC

2008-12-22

arxiv.org/abs/0812.4243v1

JHEP 0905:026,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 10 figs

Scientific paper

10.1088/1126-6708/2009/05/026

We explore the prospects for searches at the LHC for sparticle decays that violate $\tau$ lepton number, in the light of neutrino oscillation data and the seesaw model for neutrino masses and mixing. We analyse the theoretical and phenomenological conditions required for tau flavour violation to be observable in \chi_2 \to \chi + \tau^\pm \mu^\mp decays, for cosmologically interesting values of the relic neutralino LSP density. We study the relevant supersymmetric parameter space in the context of the Constrained Minimal Supersymmetric Extension of the Standard Model (CMSSM) and in SU(5) extensions of the theory. We pay particular attention to the possible signals from hadronic tau decays, that we analyse using PYTHIA event simulation. We find that a signal for \tau flavour-violating \chi_2 decays may be observable if the branching ratio exceeds about 10%. This may be compatible with the existing upper limit on \tau \to \mu \gamma decays if there is mixing between right-handed sleptons, as could be induced in non-minimal SU(5) GUTs.

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