I ( Λ ) = 1 / 2

I ( Σ ) = 1 / 2

I ( Ξ ) = 1 / 2

I ( K ) = 1

I ( γ ) = 1

I ( π ) = 1

I ( l ) = 1 for lepton l

I ( p ) = 1 / 2 , I ( n ) = 1 / 2

but I ( u d ) = I ( d d ) = I ( u u ) = 1

I ( η ) = 1