Changes between Version 7 and Version 8 of ALPsEFT
 Timestamp:
 09/20/17 16:51:15 (3 years ago)
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ALPsEFT
v7 v8 23 23 24 24 25 Two major frameworks for the electroweak sector are considered: a linear realization of electroweak symmetry breaking (EWSB), typical of weakly coupled new physics, and a nonlinear one, such as those in constructions involving new strongly interacting physics. In the first scenario, the ALP is coupled to a "linear" EFT (also called SMEFT), in which the Higgs b elongs to aSU(2) doublet and the interaction terms are organized in an expansion in mass dimension.25 Two major frameworks for the electroweak sector are considered: a linear realization of electroweak symmetry breaking (EWSB), typical of weakly coupled new physics, and a nonlinear one, such as those in constructions involving new strongly interacting physics. In the first scenario, the ALP is coupled to a "linear" EFT (also called SMEFT), in which the Higgs boson belongs to an exact SU(2) doublet and the interaction terms are organized in an expansion in mass dimension. 26 26 In the latter scenario, instead, two independent fields are introduced for the EW Goldstone bosons and for the physical Higgs, and one constructs a "chiral" EFT (sometimes also called nonlinear or HEFT), in which the effective operators are ordered according to a more complex counting that, for the Goldstone bosons sector, reduces to a derivative one. 27 27