Matches in SemOpenAlex for { <https://semopenalex.org/work/W3100443959> ?p ?o ?g. }
- W3100443959 abstract "The flavour and glue structure of the light scalar mesons in QCD are probed by studying the couplings of the I=0 mesons $sigma(600)$ and $f_0(980)$ to the operators $bar{q}q$, $alpha_s G^2$ and to two photons. The Roy dispersive representation for the $pipi$ amplitude $t_0^0(s)$ is used to determine the pole positions as well as the residues in the complex plane. On the real axis, $t_0^0$ is constrained to solve the Roy equation together with elastic unitarity up to the $KKbar$ threshold leading to an improved description of the $f_0(980)$. The problem of using a two-particle threshold as a matching point is discussed. A simple relation is established between the coupling of a scalar meson to an operator $j_S$ and the value of the related pion form-factor computed at the resonance pole. Pion scalar form-factors as well as two-photon partial-wave amplitudes are expressed as coupled-channel Omn`es dispersive representations. Subtraction constants are constrained by chiral symmetry and experimental data. Comparison of our results for the $bar{q}q$ couplings with earlier determinations of the analogous couplings of the lightest I=1 and $I=1/2$ scalar mesons are compatible with an assignment of the $sigma$, $kappa$, $a_0(980)$, $f_0(980)$ into a nonet. Concerning the gluonic operator $alpha_s G^2$ we find a significant coupling to both the $sigma$ and the $f_0(980)$." @default.
- W3100443959 created "2020-11-23" @default.
- W3100443959 creator A5057308311 @default.
- W3100443959 date "2011-12-01" @default.
- W3100443959 modified "2023-10-17" @default.
- W3100443959 title "Couplings of light I=0 scalar mesons to simple operators in the complex plane" @default.
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- W3100443959 doi "https://doi.org/10.1140/epjc/s10052-011-1814-z" @default.
- W3100443959 hasPublicationYear "2011" @default.
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