Assist. Prof. Dr. Marko Bračko (IJS): Hadron spectroscopy: experimental insight

Understanding how quarks and gluons form hadrons is the key question in hadron spectroscopy. Quantum chromodynamics (QCD), the theory which describes the strong interaction, confirms the quark model. According to the model, the fundamental particles with colour charge---quarks and gluons---do not exist independently, but constitute colour-neutral states called hadrons. Mesons (quark anti-quark) and baryons (three quarks) were proven to be hadrons obeying this principle. However, according to the theory more complex colourless particles are not forbidden. The existence of these exotic particles was discussed over decades, but the interest in this area received a strong kick in the early 2000s, after experimental observations of several new particles and measurements of their properties. The experiments, like Belle in KEK, Tsukuba, therefore played a crucial role in the renaissance of interest in hadron spectroscopy.
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