## Standard Model

Could somebody please tell me a workable definition of the term "chiral theory" , and also explain its significance? As far as I know, in a chiral theory not all the fermions obtain a mass but whether this is a definition or a derived result is not clear to me. Thanks in advance
 As to me, the term "chiral" is associated with spinors. There are 2-spinors and 4-spinors. 2-spinors are also known as Weyl spinors or chiral spinors. 4-spinors are composed of 2-spinors and their Hermitian conjugates. 4-spinors are also known as Dirac spinors. See more details in my papers http://arxiv.org/abs/math/0602359 http://arxiv.org/abs/math/0601262

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