Goldstone Bosons in the Appelquist-Terning ETC Model

Details Goldstone Bosons in the Appelquist-Terning ETC Model Goldstone Bosons in the Appelquist-Terning ETC Model

1995-05-15

arxiv.org/abs/hep-ph/9505312v1

Phys.Rev. D51 (1995) 3969-3973

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, uses harvmac, to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.51.3969

It is demonstrated that the extended technicolor model proposed recently by Appelquist and Terning has pair of potentially light $U(1)$ Goldstone bosons coupling to ordinary matter with strength $2m_f\over F_{\pi}$, where $m_f$ is the mass of the fermion and $F_{\pi} \approx 125\,\GeV$. These Goldstone bosons could get a mass if the spontaneously broken $U(1)$ symmetries are also explicitly broken, by physics beyond that specified in the model. An attempt to break these symmetries by embedding the model into a larger gauge group seems to be inadequate. The problem is because there are too many representations and there is a mismatch between the number of condensates and the number of gauge symmetries broken.

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