limits for Up: Neutrino
Physics Previous: Prospects
of WIMP Direct
The neutrino flavours , ,
are defined as weak eigenstates which couple with unit strength to e, ,
respectively. These weak eigenstates are
not, in general, states of definite mass, but instead are linear combinations
of mass eigenstates , (i = 1,2,3), hence .
Here, the unitary matrix Uli describes the mixing strength
of mass eigenstates to the corresponding left-handed weak eigenstate. This
ansatz is in close analogy to the experimentally observed weak mixing in
the quark sector.