Electroweak symmetry breaking after LEP1 and LEP2

By R. Barbieri, A. Pomarol, R. Rattazzi, Alessandro Strumia. 2004

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In a generic “universal” theory of electroweak symmetry breaking, simple symmetry considerations and absence of tuning imply that heavy new physics affects the lowenergy data through four parameters. These include and properly extend the generally insufficientS and T. Only by adding the LEP2 data to the global electroweak fit, can all these four form factors be determined and deviations from the SM be strongly constrained. Several of the recently proposed models (little Higgs, gauge bosons in extra dimensions or Higgsless models in 5D) are recognized to be “universal” in a straightforward way after a proper definition of the effective vector boson fields. Among various applications, we show that proposed Higgsless models in 5D, when calculable, do not provide a viable description of electroweak symmetry breaking in their full range of parameters.

Subfields: Artificial Intelligence, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d7f36f04e1903f72eb7369812146cfdef824a93c

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Citations in the corpus

A comprehensive approach to new physics simulations (2009, background): “ the fermions and is called the Minimal Higgsless Model or Three-Site Model [153]. A schematic “moose” diagram of the Minimal Higgsless Model is presented in Fig. 3. Precision electroweak constraints [154, 155, 156, 157] are satisﬁed in Higgsless models by allowing the fermions to delocalize into th”
Effective Lagrangian for a light Higgs-like scalar (2013, methodology): “[26], we advocate that it is more appropriate for Higgs physics for at least three reasons [4]: i) Generic models of New Physics generate a contribution to the oblique Ŝ parameter [27, 29] at treelevel, which in the basis of ref.”
Non-Gaussianities in single field inflation and their optimal limits from the WMAP 5-year data (2009, background): “ physics, loosely speaking the limits we will put on the in aton Lagrangian can be seen as the analogue of the constraints on the higher dimension operators that come from precision electroweak tests [23, 24, 25]. The only dierence is that while in collider physics we might hope to produce some of t”
Equilateral Non-Gaussianity and New Physics on the Horizon (2011, methodology): “This is similar to electroweak precision tests [9], which constrain Higgs physics without actually producing the Higgs particle.”
Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future (2016, background): “cussed above, the " iparameters involve SM contributions associated with the top quark and the Higgs boson, SM avour non-universal vertex corrections, and further vacuum-polarization corrections [36]. Since the SM is now fully known and there is no need to disentangle top-quark and Higgs-boson ”
How to use the Standard Model effective field theory (2014, methodology): “Therefore W and Y out of the four p4 order EWPO parameters supplement the classes formed by S, T, U (see also the discussions in [68]).”
Improved naturalness with a heavy Higgs boson: An alternative road to CERN LHC physics (2006, methodology): “If one tries a fit of the EWPT with a heavy Higgs, including also the LEP2 data, by adding, one at a time, the four dimension-6 operators involving the SM Higgs and gauge bosons, but not the fermions, a successful fit is obtained only from the 4-Higgs operator that corrects T [22] OH = |HDμH|(2).”