Title: Exotic states from pi+pi-/pi+-/eta + quarkonium and status of Belle II experiment
Speaker: Prof. WANG Xiaolong
Time: PM 2:00-3:30, Dec. 19th, 2017
Location: Room 437, Xing-jian Building
"What is the structure of a hadron?" is a key question to Particle Physics. In searching for the excited quarkonium states about the open-charm or open-bottom threshold via hadronic transitions by Belle, BaBar and BESIII, dozens of new structures have been observed, and they are called `exotic states'. This talk will review some exotic states observed in the systems of a quarkonium and a pair of pi+pi-, a charged pi+-, or an eta. Currently, the nature of most of the exotics is still not clear. The new intensity frontier experiment Belle II will start data taking in 2018 with the e+e- luminosity increased by 50 times, eight years after the shut down of the KEKB accelerator at KEK, Japan. There will be a unique Belle II data sample for exotic states soon, and also for heavy favor physics. The status of Belle II and the schedule will be reported.