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• W3104012012 abstract "The existence and properties of the sigma meson have been controversial for almost six decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the nucleon-nucleon attraction. This controversy has also been fed by the strong indications that it is not an ordinary quark-antiquark meson. Here we review both the recent and old experimental data and the model independent dispersive formalisms which have provided precise determinations of its mass and width, finally settling the controversy and leading to its new name: $f_0(500)$. We then provide a rather conservative average of the most recent and advanced dispersive determinations of its pole position $sqrt{s_sigma}=449^{+22}_{-16}-i(275pm12)$. In addition, after comprehensive introductions, we will review within the modern perspective of effective theories and dispersion theory, its relation to chiral symmetry, unitarization techniques, its quark mass dependence, popular models, as well as the recent strong evidence, obtained from the QCD $1/N_c$ expansion or Regge theory, for its non ordinary nature in terms of quarks and gluons." @default.
• W3104012012 created "2020-11-23" @default.
• W3104012012 creator A5033426004 @default.
• W3104012012 date "2016-11-01" @default.
• W3104012012 modified "2023-10-02" @default.
• W3104012012 title "From controversy to precision on the sigma meson: A review on the status of the non-ordinary <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si28.gif display=inline overflow=scroll><mml:msub><mml:mrow><mml:mi>f</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>500</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math> resonance" @default.
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