<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mi>H</mml:mi><mml:mi>η</mml:mi></mml:mrow></mml:math> vertex in the simplest little Higgs model
Physical review. D/Physical review. D.