
Physics Department Faculty:
Masahiro Morii
John L. Loeb Associate Professor of the Natural Sciences,Professor of Physics
PhD 1994, University of Tokyo
Masahiro Morii is an experimental physicist working on
studies of elementary particles and their interactions. He
is currently involved in an experiment at Stanford
Linear Accelerator Center, where a large number of neutral
B mesons are produced by e+ e- collisions and are observed
by the detector called BABAR.
The experiment provides new insight into the origin of the
CP violation, a phenomenon in which an apparently fundamental
symmetry of space-time is not observed by the Nature. Prof.
Morii has contributed to the construction of the BABAR detector
and an upgrade of its trigger system. He leads the semileptonic-decay
analysis working group, and seeks to determine the magnitude
of the Cabibbo-Kobayashi-Maskawa matrix elements Vub and
Vcb.
Prof. Morii is also involved in the preparation for the ATLAS
experiment at the Large Hadron Collider at CERN. The experiment
is anticipated to uncover the origin of the electroweak symmetry
breaking, and has a great potential for discovering new physics
beyond the Standard Model.

- "Observation of CP violation in the B0 meson system," BABAR Collaboration, Phys. Rev. Lett. 87 091801 (2001)
- "An improved measurement of R(b) using a double tagging method," OPAL Collaboration, Z. Phys. C 74:1-17 (1997)









