Abstract:
BEPC II is a major upgrade to the Beijing Electron Positron Collider and the Beijing Spectrometers (BES III) experiment is a completely new state-of-the-art 4 pi spectrometer. The combined facility is specialized for high-precision studies of e+eannihilation in the tau-charm threshold region.
The Standard Model (SM) has been enormously successful at describing experimental phenomena and therefore has been generally accepted as the fundamental theory of elementary particle physics. Despite its many success, the SM leaves many unanswered questions. These can be classified into two main categories: one for subjects related to possible new physics at unexplored energy scales and the other for nonperturbertive physics, mostly related to Quantum Chromodynamics (QCD).
The BES III experiment, which will operate in the 2 GeV to 4.6 GeV energy range, will be an important contributor to the understanding of QCD. This is because it spans the energy range where both short-distance and long-distance effects can be probed. BES III will make it possible to study in detail, and with unprecedentedly high precision, light hadron spectroscopy in the decays of charmonium states and charmed mesons. In this presentation, the status of the BEPC II collider and the BES III will be briefly reviewed, together with highlights of new physics results.
Coffee and tea will be served 20 minutes prior to the seminar