Changes between Version 5 and Version 6 of ALPsEFT


Ignore:
Timestamp:
Sep 20, 2017, 4:49:23 PM (7 years ago)
Author:
Ilaria Brivio
Comment:

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  • ALPsEFT

    v5 v6  
    1818
    1919The Standard Model (SM) is extended with the inclusion of a generic CP-odd scalar field, that is a singlet under the SM gauge symmetries.
    20 This new field is assumed to be an Axion-Like-Particle, i.e. the (pseudo) Nambu-Goldstone boson of an unspecified spontaneously broken U(1) symmetry, associated with a heavy scale f,,,a,,,.
     20This new field is assumed to be an Axion-Like-Particle, i.e. the (pseudo) Nambu-Goldstone boson of a spontaneously broken U(1) symmetry, associated with a heavy scale f,,,a,,,.
    2121As such, the ALP field respects an approximate shift symmetry that requires its couplings to the SM to be purely derivative and weighted by inverse powers of f,,a,,. Moreover, its mass must be much lighter than f,,a,,.
    2222These models assume the benchmark values f,,a,,= 1 TeV, m,,a,, = 1 MeV.