Flavour and polarisation in heavy neutrino production at e+ e- colliders

Details Flavour and polarisation in heavy neutrino production at e+ e- colliders Flavour and polarisation in heavy neutrino production at e+ e- colliders

2005-02-21

arxiv.org/abs/hep-ph/0502189v3

Phys.Lett. B613 (2005) 170-180

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 5 PS figures. References added. To be published in PLB

Scientific paper

10.1016/j.physletb.2005.03.054

We analyse l W nu production at ILC, paying special attention to the role of the final lepton flavour and beam polarisation in the search for a new heavy neutrino N. We show that a sizeable coupling to the electron V_eN ~ 10^-2 is necessary to have an observable signal in any of the channels, despite the fact that the signal may be more visible in muon or tau final states. The non-observation of a heavy neutrino at ILC will improve the present upper bound on its mixing with the electron by more than one order of magnitude, V_eN < 0.007 for m_N between 200 and 400 GeV.

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