infinitesimal generator in a sentence

Examples

1. where is the U ( 1 ) gauge field; is the weak hypercharge the generator of the U ( 1 ) group; " ? " } } is the three-component SU ( 2 ) gauge field; } } are the Pauli matrices infinitesimal generators of the SU ( 2 ) group ( the subscript L indicates that they only act on left fermions ) and are coupling constants.