English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We extend the usual chiral perturbation theory framework ($\chi$PT) to allowthe inclusion of a light dynamical isosinglet scalar. Using lattice QCDresults, and a few phenomenological inputs, we explore the parameter space ofthe effective theory. We discuss the S-wave pion-pion scattering lengths,extract the average value of the two light quark masses and evaluate the impactof the dynamical singlet field in the low--energy constants $\bar{l}_1$,$\bar{l}_3$ and $\bar{l}_4$ of $\chi$PT. We also show how to extract the massand width of the sigma resonance from chiral extrapolations of lattice QCDdata.

Chiral effective theory with a light scalar and lattice QCD