(S (S (BASENP (DT The) (NNP Higgs) (NN mechanism)) (VP (VBZ is) (NP (BASENP (DT a) (JJ key) (NN element)) (PP (IN of) (NP (BASENP (DT the) (JJ electroweak) (NN theory)) (SBAR (WHNP (WDT that)) (S (VP (VBZ forms) (NP (BASENP (NN part)) (PP (PP (IN of) (NP (BASENP (DT the) (NNP Standard) (NNP Model)) (PP (IN of) (BASENP (NN particle) (NN physics))))) (CONJP (COMMA ,) (CC and)) (PP (IN of) (NP (BASENP (JJ many) (NNS models)) (SBAR (WHNP (WDT that)) (S (VP (VBP go) (PP (IN beyond) (BASENP (PRP it)))))))))))))))))) (PERIOD .))