Journals of the American Physical Society - Hypercharge-universal topcolor

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January 2008, to be published in Physical Review D1

Hypercharge-universal topcolor
Felix Braam, Michael Flossdorf, R. Sekhar Chivukula, Stefano Di Chiara, and Elizabeth H. Simmons

We propose and discuss the phenomenology of a Topcolor-assisted Technicolor (TC2) model with a flavor-universal hypercharge sector. After discussing the symmetry breaking pattern and low-energy effective Lagrangian, we examine various experimental and theoretical constraints, finding that precision electroweak measurements yield the strongest bounds on the model. We perform a combined fit to all available $Z$-pole and LEP2 data and find that the goodness of fit for hypercharge-universal topcolor is comparable to that of the Standard Model. In contrast, TC2 models with a flavor non-universal hypercharge sectors are markedly disfavored by the data.

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