Search for Right-Handed Currents in Muon Decay Page: 2 of 115
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1
Search for Right-Handed Currents
in Muon Decay
Alexander Ezra Jodidio
Abstract
Limits are reported on charged right-handed currents, based on
precise measurement of the endpoint e+ spectrum in u+ decay. Highly
polarized u+ from the TRIUMF "surface" muon beam were stopped in high
purity metal foils and liquid He targets selected to minimize
depolarization effects. Decay e+ emitted within 160 mrad of the beam
direction were momentum-analyzed to 0.15$. Muons were stopped within
either a spin-precessing transverse field (70-G or 110-G) or a
spin-holding longitudinal field (0.3~T or 1.1-T). Data collected
with the spin-precessing field were used for the momentum calibration
of the spectrometer. The spin-held data were used to measure the
relative e+ rate at the endpoint. An extrapolation was made to
extract the endpoint rate opposite to the u+ spin. In terms of the
standard muon decay parameters this rate is given by (l-^P^/p) where
Pp is muon polarization. The result for fiP^/p was consistent with
the V-A prediction of 1. It is quoted as a 90$ confidence lower
limit £Pjj<5/p>0.9975 since we are unable to correct for all possible
sources of muon depolarization. For the model with manifest
left-right symmetry and massless neutrinos the result implies 90$
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Jodidio, Alexander Ezra. Search for Right-Handed Currents in Muon Decay, report, January 1, 1986; [Berkeley,] California. (https://digital.library.unt.edu/ark:/67531/metadc1099840/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.