The Fourth SM Family Neutrino at Future Linear Colliders

Abstract

It is known that Flavor Democracy favors the existence of the fourth standard model (SM) family. In order to give nonzero masses for the first three family fermions Flavor Democracy has to be slightly broken. A parametrization for democracy breaking, which gives the correct values for fundamental fermion masses and, at the same time, predicts quark and lepton CKM matrices in a good agreement with the experimental data, is proposed. The pair productions of the fourth SM family Dirac $({\nu }_4)$ and Majorana $(N_1)$ neutrinos at future linear colliders with $\sqrt{s}=500$ GeV, 1 TeV and 3 TeV are considered. The cross section for the process $e^{+}{e}^{-}\to {\nu }_4\overline{{\nu }_4}(N_1{N}_1)$ and the branching ratios for possible decay modes of the both neutrinos are determined. The decays of the fourth family neutrinos into muon channels $({\nu }_4(N_1)\to {\mu }^{\pm }{W}^{\mp })$ provide cleanest signature at $e^{+}{e}^{-}$ colliders. Meanwhile, in our parametrization this channel is dominant. $W$ bosons produced in decays of the fourth family neutrinos will be seen in detector as either di-jets or isolated leptons. As an example we consider the production of 200 GeV mass fourth family neutrinos at $\sqrt{s}=500$ GeV linear colliders by taking into account di-muon plus four-jet events as signatures.

16 pages, 3 figures, 10 tables

References in corpus (2)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• A New Parametrization of the Neutrino Mixing Matrix

Cited by in corpus (23)

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• Single Production of Fourth Family $t^{\prime }$ Quarks at LHeC
• A Search for the Fourth SM Family: Tevatron still has a Chance
• Possible Discovery Channel for New Charged Leptons at the LHC
• Anomalous Single Production of the Fourth Generation Quarks at the LHC
• $SU(3{)}_c\otimes SU(3{)}_L\otimes U(1{)}_X$ models with four families
• Tevatron Discovery Potential for Fourth Generation Neutrinos: Dirac, Majorana and Everything in Between
• Experimental Sensitivity for Majorana Neutrinos Produced via a Z Boson at Hadron Colliders
• Possible Single Resonant Production of the Fourth Generation Charged Leptons at $\gamma e$ Colliders
• A Search for the Fourth SM Family Quarks through Anomalous Decays
• Masses and decay constants of bound states containing fourth family quarks from QCD sum rules
• eV Seesaw with Four Generations
• Anomalous Single Production of the Fourth Generation Neutrino at Future ep Colliders
• Anomalous single production of the fourth generation charged leptons at future ep colliders
• Single Production of Fourth Family b' Quark at the Large Hadron electron Collider
• Hints from Tevatron, a prelude to what?
• Pair Production of Fourth Family Charged Sleptons at $e^{+}{e}^{-}$ Colliders