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| Measurement of the CP asymmetry in the two pion decay of B-meson |
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Performance of the KEKB accelerator has been improving rapidly. It recorded
the world highest luminosity ever achieved by the electron-positron colliding
accelerators.
The Belle experiment has accumulated in excess of 60 million pairs of B
and anti-B mesons by March 10, 2002. Data analysis of about 45 million
pairs,collected by the end of year 2001, yielded 74 events in which neutral
B mesons decay into two oppositely charged pions. Upon careful examination,
the Belle group found that the probability for the B-meson decaying into
two oppositely charged pions is different from that for the anti-B meson.
This is the second such measurements by the Belle experiment where the
phenomena of B meson decays show asymmetry between particles and anti-particles.This
finding will certainly enhance further our understanding of the mystery
of the nature of elementary particles.
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