A Direct Measurement of the Muon Neutrino Mass to 8 keV

Details A Direct Measurement of the Muon Neutrino Mass to 8 keV A Direct Measurement of the Muon Neutrino Mass to 8 keV

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..aprc10005c&link_type=abstract

American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.

Astronomy and Astrophysics

Astrophysics

Scientific paper

A new experiment to improve the muon neutrino mass limit by a factor of 20 (to 8 keV) would produce the largest factor improvement made in any neutrino species mass within the last 20 years. It utilizes the BNL g-2 storage ring as an extremely uniform spectrometer to compare the parent pion and daughter muon momenta from pion decay in flight. The experiment avoids multiple scattering limitations by transforming the momentum measurement into a position measurement: the edge of the muon radial distribution referenced on an event-by-event basis to the parent pion depends on the mass of the recoiling neutrino. The method itself, as well as advances in the precision instrumentation required to make it possible, will be presented. The new limit provides constraints on astrophysics, improves the precision of the Fermi Coupling Constant and the pion mass, and provides complementary information to the neutrino oscillation experiments.

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