25.10.2018 15:15

Sonderseminar Elisabetta Prencipe (FZ Jülich)

Search for Exotic States with Charm- and Strange Quark Content

Since more than a decade experimental proof of exotic matter has been shown at e+e- colliders, followed by subsequent confirmations and even new observations at LHC. Theoretical models have been elaborated to explain these new forms of matter, such as tetraquarks, pentaquarks, and even hexaquarks, to try to explain and better classify those states, but still non-unambiguous answers have been given. Due to limitations of statistics or detector setups, the nature of some of these new resonant states is unknown, yet. Clear examples are the narrow X(3872), the X(4140), and the Ds0*(2317). For the latter, the contribution of the BaBar and Belle experiments in measuring branching ratios and fix width upper limits was fundamental. A connection can be established among these states, that could allow new theoretical developments, since it is still not clear whether all of them can fit the same model. The low reconstruction efficiency in some decays, involving the reconstruction of low energy photons, and the rare physics processes needed to be analyzed, demanded for a detector upgrade. The Belle II detector at KEKB facility (Japan) is a major upgrade of the Belle detector, and just successfully concluded in July 2018 the Phase-II of data taking. Analyzing resonant states with charm- and strange quark content is a field to be almost completely explored: unique opportunities with Belle II are possible, which might eventually make possible to address new answers for a better understanding of the hadron spectroscopy. As a final remark, a look at the future PANDA experiment at GSI (Germany) will be given, being PANDA a planned experiment with momentum resolution in the range of 10-4 - 10-5, which is necessary to measure the very narrow width of some of those exotic states. A fully understanding of the Charm- and Charmonium spectrum would be possible only with a deep connection among theorists and experimental physicists, and combining results from different experimental setups.

 

Hörsaal HISKP, Raum 0.023

Kategorie: News, HISKP News, Kolloquium