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PhD ceremony Ms. O. Romanets: Dynamically-generated baryon resonances with heavy flavor

When:Fr 10-01-2014 at 11:00
Where:Academiegebouw, Broerstraat 5, Groningen

PhD ceremony: Ms. O. Romanets

Dissertation: Dynamically-generated baryon resonances with heavy flavor

Promotor(s): prof. R.G.E. Timmermans

Faculty: Mathematics and Natural Sciences

The study of heavy hadrons is a central topic in particle physics. In contrast to the particles built of light quarks, states that contain heavy quarks (charm or bottom) are difficult to treat, because there is no rigorous model to describe these states.

On the other hand, the development of new techniques in experimental physics makes possible the observation of new states with heavy flavor. It is nowadays a challenge to interpret the nature of these new detected particles. Hadron resonances (particles that can decay in other ones) can be interpreted as states made of quarks or/and states built of hadrons, called molecular states.

In this thesis we study baryon resonances with heavy flavor, molecular states generated dynamically from the scattering of mesons with baryons. For this purpose we use a model which respects two important symmetries Quantum Chromodynamics, chiral symmetry and heavy-quark spin symmetry.

We find charm and strange baryon resonances that can be compared to experimental states, and also make predictions for other states, with total number of charm 1, 2, and 3. Moreover, two bottom-flavored states with masses 5912 and 5920 MeV have been obtained in our model. These states were found by the LHCb collaboration last year. We have also analyzed hidden-charm baryon resonances, and predict states with masses around 4 GeV, most of them as bound states. All these results will be tested in the near future by the PANDA experiment at the FAIR facility in Germany.

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