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Universal extra dimensions and Z -> b(b)over-bar

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	Oliver Guillén, José Francisco; Papavassiliou, Joannis; Santamaria, Arcadi Perfil
	This document is a artículoDate2003
	Este documento está disponible también en : http://hdl.handle.net/10550/43009
	We study, at the one loop level, the dominant contributions from a single universal extra dimension to the process (Z\to b\bar{b}). By resorting to the gaugeless limit of the theory we explain why the result is expected to display a strong dependence on the mass of the top-quark, not identified in the early literature. A detailed calculation corroborates this expectation, giving rise to a lower bound for the compactification scale which is comparable to that obtained from the ρ parameter. An estimate of the subleading corrections is furnished, together with a qualitative discussion on the difference between the present results and those derived previously for the non-universal case.
	Oliver Guillén, José Francisco; Papavassiliou, Joannis; Santamaria, Arcadi (2003) Universal extra dimensions and Z -> b(b)over-bar Physical Review D 67 5 056002
	http://dx.doi.org/10.1103/PhysRevD.67.056002