Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-11-03
Phys.Rev.D79:015002,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 6 figures
Scientific paper
10.1103/PhysRevD.79.015002
Based on previous studies computing coefficients of the electroweak chiral Lagrangian from C.T.Hill's schematic topcolor-assisted technicolor model, we generalize the calculation to K.Lane's prototype natural topcolor-assisted technicolor model. We find that typical features of the model are qualitatively similar as those of Hill's model, but Lane's model prefers smaller technicolor group and Z' mass must be smaller than 400GeV, further S parameter is around order of +1 mainly due to existence of three doublets of techniquarks. We obtain the values for all coefficients of the electroweak chiral Lagrangian up to order of p^4. Apart from negative large four fermion coupling values, ETC impacts on the electroweak chiral Lagrangian coefficients are small, since techniquark self energy which determines these coefficients in general receives almost no influence from ETC induced four fermion interactions except for its large momentum tail.
Jiang Shao-Zhou
Lang Jun-Yi
Wang Qing
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