F.J.M. Farley

A New Measurement of the Anomalous Magnetic Moment of the Muon

By analysis of the precession of polarized mu mesons in a 16-kOe magnetic field, the anomalous magnetic moment of the mu meson is measured as (1162 plus or minus 5) x 10/sup -6/. The results, within 5 parts in 10/sup 5/, also yield that the mu charge (q/sub mu /) is equal to the electron charge (q/ sub e/) and that the charge of the nu /sub mu / equals zero. The results are used to calculate the mu mass as (206.768 plus or minus 0.003)m/sub e/. (T.F.H.)

Precision measurement of the anomalous magnetic moment of the muon

The muon g-2 experiment at Brookhaven National Laboratory measures the anomalous magnetic moment of the muon, aμ, very precisely. This measurement tests the Standard Model. The analysis for the data collected in 2000 (a μ run) is completed and the accuracy on aμ is improved to 0.7 ppm, including statistical and systematic errors. The data analysis was performed blindly between the precession frequency and the field analysis groups in order to prevent a possible bias in the aμ result. The result is aμ(exp) = 11 659 204(7)(5)× 10−10 (0.7 ppm). This paper features a detailed description of one of the four analyses and an update of the theory. XXX SLAC Summer Institute (SSI2002), Stanford, CA, 5-16 August, 2002

Optimum strategy for energy degraders and ionization cooling

Methodology for calculating the profile and emittance of a particle beam as it is slowed down in matter, including the effects of multiple scattering, axial magnetic field and lithium lens. Strategies are determined for minimum final emittance. For ionization cooling, boron carbide has advantages over liquid hydrogen if the beam can be focused onto a small enough area, which may be possible using strong axial fields.

Separated high-energy electron beams using synchrotron radiation

Abstract Electrons with kinetic energy in the 100 GeV range may be separated from other particles by using their energy-loss due to synchrotron radiation in a high-field magnet. In this paper the associated fluctuations in energy and angle are shown to be small enough for the method to be useful. Detailed design formulae are presented for several magnet configurations.

Quenching of muon depolarization by weak magnetic fields

If muons are stopped in an electrically conducting material they suffer very little depolarization. In insulators the results are variable, some materials giving no depolarization (bromoform, methylene iodide), while in others (sulfur, NaCl) the depolarization is almost complete. Depolarization in the case of a plastic scintillator target was measured. Re-establishment of polarization at low fields was detected. At ~ 150 gauss, the asymmetry reached about 50% of its full value. Results are represented in graphical form. (L.N.N.)

PRECISION MEASUREMENT OF THE ANOMALOUS MAGNETIC MOMENT OF THE MUON

The muon g-2 experiment at Brookhaven National Laboratory measures the anomalous magnetic moment of the muon,

The muon anomalous magnetic moment

a_\mu

Effect of light flash on photocathodes

, very precisely. This measurement tests the Standard Model. The analysis for the data collected in 2000 (a

The muon g—2 experiment at Brookhaven

\mu^+

Test of the second postulate of special relativity in the GeV region

run) is completed and the accuracy on