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T: Fachverband Teilchenphysik

T 54: Invited Topical Talks 3

T 54.1: Eingeladener Vortrag

Mittwoch, 23. März 2022, 11:00–11:25, T-H15

Hunting XYZ Beasts at Belle and Belle II — •Elisabetta Prencipe for the Belle II collaboration — Justus-Liebig-University of Giessen, Giessen, Germany

The search for conventional and non-conventional charmonium states has gained a lot of attention over the past twenty years. It has undoubtedly been shown since 2003 that there are more complex structures than mesons and baryons, and for several of those a non-unique interpretation has been provided, mainly due to the lack of statistics. We refer to these resonant states as X, Y, Z, depending on their properties. Recently the PDG has renamed those that are well established, trying to provide a better understanding. Undoubtedly B factories such as Belle and BaBar have in the past made a notable contribution in filling in the missing blocks of the charmonioum spectrum; however, the limited statistics did not allow to search further for these exotic XYZ states.

LHCb collected huge data sets, which allowed to conduct interesting analyses in the i.e. search for pentaquarks and the properties of the X(3872). An important contribution to the field will come from the Belle II data, once the planned integrated luminosity is reached, in particular in the search for exotic states in radiative decays, ISR and Υ(nS) transitions, which represent unique physics cases.

Recent spectroscopy results with the complete Belle data sets are discussed, and a summary of results in charmonium and bottomonium spectroscopy is provided with current Belle II data. Future plans with Belle + Belle II combined data sets are then presented.