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The extraordinary case of the sigma or f0(500) meson and the lightest scalar mesons

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If you have a question about this talk, please contact Francesco Coradeschi .

I will review the relevance of the lightest scalar mesons in our understanding of Hadron sepctroscopy. In particular why their non-quark-antiquark nature and even their existence have been under strong debate for over 60 years. I will explain how this debate has been settled in the last few years by means of new data, effective theories and dispersive approaches and I will discuss the remaining open questions in this topic.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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