Chiral perturbation theory with an isosinglet scalar

Martin Hansen, Kasper Langæble, Francesco Sannino

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Abstrakt

We present an extension of chiral perturbation theory that explicitly includes an isosinglet scalar in the Lagrangian. The dynamical effects from the scalar state is of phenomenological relevance in theories where the mass of the isosinglet scalar is comparable to the mass of the pseudo-Goldstone bosons. This near-degeneracy of states is for example observed in certain near-conformal BSM models. From the Lagrangian we calculate the one-loop radiative corrections to the pion mass, the pion decay constant, and the scalar mass. We then proceed and use the results to fit numerical lattice data for an SU(3) gauge theory with Nf = 8 light flavours in the fundamental representation.

OriginalsprogEngelsk
Artikelnummer222
TidsskriftProceedings of Science
Vol/bind336
Antal sider11
ISSN1824-8039
DOI
StatusUdgivet - 2018
Begivenhed13th Quark Confinement and the Hadron Spectrum, Confinement 2018 - Maynooth, Irland
Varighed: 31. jul. 20186. aug. 2018

Konference

Konference13th Quark Confinement and the Hadron Spectrum, Confinement 2018
LandIrland
ByMaynooth
Periode31/07/201806/08/2018

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