If you have questions or more information, please contact Doug.Wright@llnl.gov.
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<p> 12-19-01

<p>Recently theorists have found a mistake in the Standard Model
calculation for g-2 (magnetic moment) of the muon. The precise
measurement at Brookhaven announced in February had a 1% chance of
being consistent with the theory. Now with the corrected theory
calculation, the probability that the measurement is a statistical
fluke rises to 13%.

<p><a href=g2_physweb.txt>Physics Web Article, Dec. 17, 2001</a>

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The E821 experiment at Brookhaven has announced their latest result on
the magnetic moment of muons. They measure the frequency of the
precession of the spin of muons in the magnetic field of a storage
ring.  Their current result, using data from 1999, is 2.6 sigma from
the Standard Model prediction. This difference could be interpreted as
indirect evidence for supersymmetry appearing in the 120-400 GeV mass
region.  In 2000 they recorded 4 times the data of 1999, so an
improved result is forthcoming.

<ul>
<li><a href=g2.ps>Preprint (ps) Feb. 9, 2001</a>
<li><a href=g2_nyt.html>NY Times article Feb. 8, 2001</a>
</ul>