Changes between Version 8 and Version 9 of ALPsEFT

Timestamp:

Sep 20, 2017, 4:54:09 PM (7 years ago)

Author:

Ilaria Brivio

Comment:

--

ALPsEFT

@@ -24 +24 @@
 
 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 non-linear 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.
-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 non-linear 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.
+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 non-linear EFT 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 expansion.
 
-The models presented here implement complete sets of operators for ALP interactions with the bosonic sector of the SM, up to next-to-leading terms in the effective expansion.
-This corresponds to 4 operators of dimension 6 for the linear EFT and to 18 invariants with up to 4 derivatives for the chiral EFT. The operators are defined with an NDA normalization, according to the notation used in  [https://arxiv.org/abs/1701.05379/ arXiv:1701.05379].
+The models presented here implement complete sets of CP-even operators for ALP interactions with the bosonic sector of the SM, up to next-to-leading terms in the effective expansions.
+These amount to 4 operators of dimension 5 for the linear EFT and to 18 operators with up to 4 derivatives for the chiral EFT. 
+The chiral operators are defined with an NDA normalization, according to the notation used in  [https://arxiv.org/abs/1701.05379/ arXiv:1701.05379].
 
 
 
-
-The Feynrules models supplied contain only the definition of the ALP particle and of its interactions, and should therefore be loaded alongside the SM Lagrangian.
+Note that the models supplied contain only the definition of the ALP particle and of its interactions, and should therefore be loaded alongside the SM.