PT Journal
AU Pich, A
   Rosell, I
   Santos, J
   Sanz-Cillero, JJ
TI Fingerprints of heavy scales in electroweak effective Lagrangians
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2017
BP 012
EP 60pp
VL 04
IS 4
DI 10.1007/JHEP04(2017)012
LA English
DE Beyond Standard Model; Chiral Lagrangians; Higgs Physics; Technicolor and Composite Models
AB The couplings of the electroweak effective theory contain information on the heavy-mass scales which are no-longer present in the low-energy Lagrangian. We build a general effective Lagrangian, implementing the electroweak chiral symmetry breaking SU(2)(L) circle times SU(2)(R) -> SU(2)(L+R), which couples the known particle fields to heavier states with bosonic quantum numbers J(P) = 0(+/-) and 1(+/-). We consider colour-singlet heavy fields that are in singlet or triplet representations of the electroweak group. Integrating out these heavy scales, we analyze the pattern of low-energy couplings among the light fields which are generated by the massive states. We adopt a generic non-linear realization of the electroweak symmetry breaking with a singlet Higgs, without making any assumption about its possible doublet structure. Special attention is given to the different possible descriptions of massive spin-1 fields and the differences arising from naive implementations of these formalisms, showing their full equivalence once a proper short-distance behaviour is required.
ER