RT Journal Article
T1 Precision dispersive approaches versus unitarized chiral perturbation theory for the lightest scalar resonances sigma/f(0)(500) and kappa/K*(0)(700)
A1 Peláez Sagredo, José Ramón
A1 Rodas, Arkaitz
A1 Ruiz De Elvira Carrascal, Jacobo
AB For several decades, the sigma/f(0)(500) and kappa/K*(0)(700) resonances have been subject to long-standing debate. Both their existence and properties were controversial until very recently. In this tutorial review, we compare model-independent dispersive and analytic techniques versus unitarized Chiral Perturbation Theory, when applied to the lightest scalar mesons sigma/f(0)(500) and kappa/K*(0)(700). Generically, the former have settled the long-standing controversy about the existence of these states, providing a precise determination of their parameters, whereas unitarization of chiral effective theories allows us to understand their nature, spectroscopic classification and dependence on QCD parameters. Here we review in a pedagogical way their uses, advantages and caveats.
PB Springer Heidelberg
SN 1951-6355
YR 2021
FD 2021-06-16
LK https://hdl.handle.net/20.500.14352/8270
UL https://hdl.handle.net/20.500.14352/8270
LA eng
NO © 2021 Springer Heidelberg.We acknowledge J.A. Oller for encouraging us to write a tutorial review on this topic. We thank I. Danilkin for his corrections on the manuscript. This project has received funding from the Spanish Ministerio de Ciencia e Innovacion grant PID2019-106080GB-C21 and the European Union's Horizon 2020 research and innovation program under grant agreement No 824093 (STRONG2020). AR acknowledges the financial support of the U.S. Department of Energy contract DE-SC0018416 at William & Mary, and contract DE-AC05-06OR23177, under which Jefferson Science Associates, LLC, manages and operates Jefferson Lab. JRE acknowledges financial support from the Swiss National Science Foundation under Project No. PZ00P2174228.
NO Unión Europea. H2020
NO Ministerio de Ciencia e Innovación (MICINN)
NO Swiss National Science Foundation (SNSF)
NO United States Department of Energy (DOE)
DS Docta Complutense
RD 8 abr 2025