ℓWν production at CLIC: a window to TeV scale non-decoupled neutrinos
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Beyond Standard ModelNeutrino Physics
Águila, F.; Aguilar-Saavedra, J.A. ℓWν production at CLIC: a window to TeV scale non-decoupled neutrinos. Journal of High Energy Physics, 05: 026 (2005). [http://hdl.handle.net/10481/30677]
PatrocinadorThis work has been supported in part by MEC and FEDER Grant No. FPA2003-09298-02-01, by Junta de Andalucía Group FQM 101, by FCT through projets POCTI/FNU/44409/2002, CFTP-FCT UNIT 777 and grant SFRH/BPD/12603/2003, and by the European Community's Human Potential Programme under contract HPRN-CT-2000-00149 Physics at Colliders.
We discuss single heavy neutrino production e+ e- -> N nu -> l W nu, l = e, mu, tau, at a future high energy collider like CLIC, with a centre of mass energy of 3 TeV. This process could allow to detect heavy neutrinos with masses of 1-2 TeV if their coupling to the electron V_eN is in the range 0.004-0.01. We study the dependence of the limits on the heavy neutrino mass and emphasise the crucial role of lepton flavour in the discovery of a positive signal at CLIC energy. We present strategies to determine heavy neutrino properties once they are discovered, namely their Dirac or Majorana character and the size and chirality of their charged current couplings. Conversely, if no signal is found, the bound V_eN < 0.002-0.006 would be set for masses of 1-2 TeV, improving the present limit up to a factor of 30. We also extend previous work examining in detail the flavour and mass dependence of the corresponding limits at ILC, as well as the determination of heavy neutrino properties if they are discovered at this collider.