The big news today is that we've made
our best measurement ever on an atom of
antimatter, the anti hydrogen, that we
make in store and trap and study here in
the ad, so, what we've done is measure the
spectral line, kind of a color of the
anti hydrogen atom with a precision of a
few parts per trillion, that's a factor
of a hundred better than we did in the
first measurements a year ago. This is
the best thing we've ever been able to
do with a direct measurement on
antimatter, it's most precise and the
most accurate measurements that we've
had to date. So, what we're looking for is
if hydrogen in matter and anti hydrogen
in antimatter behave in the same way, so
now this is our most precise test to
date of that question, and so far they
look the same,
not just where the light comes out,
but also kind of the shape of the line,
the characteristic, the detailed
characteristic of this spectral line
agrees very well with hydrogen to the
current level of precision. So, compared
to what we did last year, that
measurement just identified that there
was a transition, there was some light
that could be absorbed and re-emitted by
anti hydrogen. Now, what we've
done is really characterize how much
light gets absorbed at different
frequencies, so actually measure the
shape of the transition in anti hydrogen,
and that allows us to make a much more
precise comparison with the matter
transition which has been studied for
many many years.
