Phys. Rev. Lett. 72, 1322–1325 (1994)Precise measurement of the Λ0 and Λ¯0 masses and a test of CPT invarianceSee Also: Erratum Received 9 November 1993; published in the issue dated 28 February 1994 A precision measurement of the masses of the Λ0 and Λ¯0 hyperons is obtained from Gaussian fits to the invariant mass distributions for 20 138 Λ0’s and 18 309 Λ¯0’s. The Gaussians have standard deviations of 0.49 and 0.51 MeV/c2 for the Λ0 and Λ¯0, respectively. Systematic errors were reduced by calibrating the spectrometer with 60 000 exclusive events containing a KS0. We find MΛ=1115.678±0.006±0.006 MeV/c2 and MΛ¯=1115.690±0.008±0.006 MeV/c2. The Λ0-Λ¯0 mass difference testing CPT invariance is -0.012±0.010 MeV/c2. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.72.1322
DOI:
10.1103/PhysRevLett.72.1322
PACS:
14.20.Jn, 11.30.Er
See AlsoErratum: E. P. Hartouni, D. A. Jensen, M. N. Kreisler, J. Uribe, M. D. Church, E. E. Gottschalk, B. C. Knapp, B. J. Stern, L. R. Wiencke, D. C. Christian, G. Gutierrez, S. D. Holmes, A. Wehmann, C. Avilez, M. Forbush, F. R. Huson, and J. T. White, Precise Measurement of the Λ0 and Λ̅ 0 Masses and a Test of CPT Invariance, Phys. Rev. Lett. 72, 2821 (1994). |
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