Speaker
Boris Shwartz
(Budker Institute of Nuclear Physics)
Description
In the end of June 2010, the Belle project completed its operation after 10 years of experiments and collection of more than 1000 fb-1 of integrated luminosity at the KEKB asymmetric-energy e+e- collider. The energy range of this experiment comprised the area of upsilon meson family. The world highest luminosity of the collider, 2*10^34cm-2s-1, as well as high quality and performance of the Belle detector provided a basis to obtain numerous results in several fields of particle physics. Although the most known Belle achievements concern the CP symmetry violation in the quark sector, very important results were also obtained in the heavy quarkonium spectroscopy, tau lepton decays and two-photon physics.
Motivated by the success of the KEKB/Belle experiment, the new advanced project, KEKB II/Belle II was accepted. The KEKB II luminosity will exceed the previous one by about 40 times. In several aspects, Belle II will have considerably higher performance than Belle:
• the vertex resolution is improved by the excellent spatial resolution of the two innermost pixel detector layers;
• the efficiency of the reconstruction of KS decay to two charged pions with hits in the sili-con strip detector is improved because of a larger volume occupied by this detector;
• the new particle identification systems in the barrel and endcap regions extend the very good pion/kaon separation to the kinematic limits of the experiment;
• the new electronics of the electromagnetic calorimeter considerably reduce the noise pile up which is especially important for the missing energy studies.
This upgrade will open exciting possibilities in a search and study of new physics phenomena in the heavy quarkonia, lepton flavour violation in tau decays as well as in other particle physics fields.
Primary author
Boris Shwartz
(Budker Institute of Nuclear Physics)
