DOI 10.1007/s100529800953
The hadronic contribution to the muon g-2
from hadron production in initial state radiation
events
at the e+e- collider DA
NE
Dipartimento di Fisica dell'Università di Lecce and INFN, Sezione di Lecce, via Arnesano I-73100 Lecce, Italy
Received: 27 April 1998 / Published online: 26 August 1998
Abstract
A relevant reduction of the theoretical uncertainty on the muon anomalous
magnetic moment, dominated by the error on the leading hadronic contribution
, would come from a new precise measurement
of the cross section of e+e- annihilation into hadrons (
) below 1 GeV.
An experimental approach to the evaluation of the dispersion integral
defining
is proposed here as an alternative to the
conventional method based on the interpolation of different
measurements of
performed with a center of mass energy scan.
The wide occurrence of
hadron production, at variable q2, in the initial state radiation (ISR)
events at the high luminosity
-factory DA
NE suggests to
redefine
the dispersion integral in terms of the differential cross section for
. The feasibility of such measurement, which can be performed without the
need of dedicated run conditions and with the benefit of the full
luminosity of the machine, is discussed. The required precision is shown
to be easily achieved thanks to the resolutions and performances of the KLOE
detector.
Copyright Springer-Verlag