Measurement of the Average and Longitudinal Recoil Polarizations in the $^{12}$C ($\mu^-,\nu$) $^{12}$B (G.S.): Magnitude of the Induced Pseudoscalar Coupling - INSPIRE

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Measurement of the Average and Longitudinal Recoil Polarizations in the $^{12}$ C ( $\mu^-,\nu$ ) $^{12}$ B (G.S.): Magnitude of the Induced Pseudoscalar Coupling

1981

4 pages

Published in:

Phys.Rev.Lett. 46 (1981) 1507-1510

DOI:

10.1103/PhysRevLett.46.1507

Experiments:

PSI-R-77-01

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Abstract: (APS)

The polarizations, Pav≡〈J→·σ→μ〉J and PL≡〈J→·v^〉J, of the recoils C12(μ−,ν)B12(g.s.) were measured simultaneously by selective recoil implantation. Their ratio R′ is largely immune to the systematics of Pav and PL and more dependent on the dynamics than either. Our result (normalized to unit P→μ), R(g.s.)=−0.506(41), yields gPgA=9.0(1.7) (impulse approximation) and FPFA(qm2)=−1.03(14) (elementary-particle treatment), to be compared to partial conservation of axial-vector current (PCAC) predictions of 7 and - 0.99, respectively. Thus PCAC is quantitatively verified.

MUON- LIGHT NUCLEUS: CAPTURE
CAPTURE: MUON- LIGHT NUCLEUS
CARBON
BORON: NUCLIDE
RECOIL: POLARIZATION
POLARIZATION: RECOIL
APPROXIMATION: IMPULSE
PCAC model
PROPORTIONAL CHAMBER: EXPERIMENTAL RESULTS
SIN CYCL

References(13)

Figures(0)

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