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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 1999, vol. 82, p. 1632-1635

New Measurement of the Anomalous Magnetic Moment of the Positive Muon

Carey R. M., Earle W., Efstathiadis E., Hare M. F., Hazen E. S., Hughes B. J., Krienen F., Miller J. P., Monich V., Ouyang J., Rind O., Roberts B. L., Sulak L. R., Trofimov A., Varner G., Worstell W. A., Benedict E., Logashenko I., Benante J., Brown H. N., Bunce G., Cullen J., Danby G. T., Geller J., Hseuh H., Jackson J. W., Jia L., Kochis S., Larsen R., Lee Y. Y., Mapes M., Meng W., Morse W. M., Pai C., Pearson C., Polk I., Prigl R., Rankowitz S., Sandberg J., Semertzidis Y. K., Shutt R., Snydstrup L., Soukas A., Stillman A., Tallerico T., Tanaka M., Toldo F., von Lintig D., Warburton D., Woodle K., Chertovskikh A., Druzhinin V. P., Fedotovich G. V., Grigorev D. N., Golubev V. B., Khazin B. I., Maksimov A., Merzliakov Yu, Ryskulov N., Serednyakov S., Shatunov Y. M., Solodov E., Orlov Y., Winn D., Grossmann A., Gerhaeuser J., Jungmann K., von Walter P., zu Putlitz G., Bunker B., Deninger W., Debevec P. T., Hertzog D. W., Jones T. D., Polly C., Sedykh S., Urner D., Haeberlen U., Endo K., Hirabayashi H., Kurokawa S., Yamamoto A., Green M. A., Cushman P., Kindem J., Duong L., Giron S., McNabb R., Miller D., Timmermans C., Zimmerman D., Mizumachi Y., Iwasaki M., Ahn H. E., Deng H., Dhawan S. K., Disco A., Farley F. J M, Fei X.

The muon anomalous magnetic moment has been measured in a new experiment at Brookhaven. Polarized muons were stored in a superferric ring, and the angular frequency difference, ωa, between the spin precession and orbital frequencies was determined by measuring the time distribution of high-energy decay positrons. The ratio R of ωa to the Larmor precession frequency of free protons, ωp, in the storage-ring magnetic field was measured. We find R = 3.707 220(48) × 10-3. With μμ/μp = 3.183 345 47(47) this gives aμ+ = 1 165 925(15) × 10-9 (±13ppm), in good agreement with the previous CERN measurements for μ+ and μ- and of approximately the same precision.