Resent Results and Current Status of the Muon (g–2) Experiment
at BNL  12/2003; DOI:10.1007/978-3-540-45059-7_9  ABSTRACT The
measurement of the (g−2) value of leptons provides a unique test
of theory since it is the only quantity (unlike charge and mass)
calculable in the framework of the Standard Model of elementary
particles. The muon (g−2) experiment E821 is currently in
progress at Brookhaven National Laboratory. Four data taking
runs for positive muons and one run for negative muons were
successfully accomplished in 1997–2000 and 2001, respectively.
Results of the 1997–2000 runs have been published, thus
completing our experiment for μ+. Data analysis for the 2001 run
for μ − is currently in progress. To provide measurement of
$a_\mu = \tfrac{1} {2}(g - 2)_{\mu ^ - }$a_\mu = \tfrac{1} {2}(g
- 2)_{\mu ^ - } at the same level of accuracy as for $a_{\mu ^ +
} = \tfrac{1} {2}(g - 2)_{\mu ^ + }$a_{\mu ^ + } = \tfrac{1}
{2}(g - 2)_{\mu ^ + }, we need to have one more data taking run.
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