München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 25: Quantenfeldtheorie

T 25.3: Talk

Friday, March 13, 2009, 14:30–14:45, M010

Is vacuum stability UV sensitive? — •Charlotte Hellmann, Stefano Actis, and Martin Beneke — Institut für Theoretische Physik E, RWTH Aachen

An upper and lower bound on the Higgs mass can be derived from the requirement that the Standard Model is perturbative and the electroweak vacuum is stable up to a certain scale.

In recent work Fodor et al. raise the issue that vacuum stability can only be addressed with non-perturbative methods and is sensitive to physics at the cut-off such that vacuum instability is absent when ultraviolet effects are correctly accounted for.

We discuss these issues in an toy model with an additional heavy scalar and find that UV physics decouples and does not change the conclusions on instability of the electroweak vacuum, if the scale of UV physics is above the scale, where the electroweak vacuum becomes unstable according to the standard perturbative calculation. We also investigate the effect of higher-dimensional operators.