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Phys. Rev. Lett. 96, 242001 (2006) [4 pages]

Measurement of the Asymmetry in the Decay [overline Omega ]+-->[overline Lambda ]K+-->[overline p]pi+K+

L. C. Lu,10 R. A. Burnstein,5 A. Chakravorty,5 Y. C. Chen,1 W.-S. Choong,2,7 K. Clark,9 E. C. Dukes,10 C. Durandet,10 J. Felix,4 Y. Fu,7 G. Gidal,7 H. R. Gustafson,8 T. Holmstrom,10 M. Huang,10 C. James,3 C. M. Jenkins,9 T. D. Jones,7 D. M. Kaplan,5 M. J. Longo,8 W. Luebke,5 K.-B. Luk,2,7 K. S. Nelson,10 H. K. Park,8 J.-P. Perroud,6 D. Rajaram,5 H. A. Rubin,5 J. Volk,3 C. G. White,5 S. L. White,5 and P. Zyla7

(HyperCP Collaboration)

1Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, Republic of China
2University of California, Berkeley, California 94720, USA
3Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
4Universidad de Guanajuato, 37000 León, Mexico
5Illinois Institute of Technology, Chicago, Illinois 60616, USA
6Université de Lausanne, CH-1015 Lausanne, Switzerland
7Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
8University of Michigan, Ann Arbor, Michigan 48109, USA
9University of South Alabama, Mobile, Alabama 36688, USA
10University of Virginia, Charlottesville, Virginia 22904, USA
Received 20 March 2006; published 22 June 2006

The asymmetry in the [overline p] angular distribution in the sequential decay [overline Omega ]+-->[overline Lambda ]K+-->[overline p]pi+K+ has been measured to be [overline alpha ]Omega[overline alpha ]Lambda=[+1.16±0.18(stat)±0.17(syst)]×10-2 using 1.89×106 unpolarized [overline Omega ]+ decays recorded by the HyperCP (E871) experiment at Fermilab. Using the known value of alphaLambda, and assuming that [overline alpha ]Lambda=-alphaLambda, [overline alpha ]Omega=[-1.81±0.28(stat)±0.26(syst)]×10-2. A comparison between this measurement of [overline alpha ]Omega[overline alpha ]Lambda and recent measurements of alphaOmegaalphaLambda made by HyperCP shows no evidence of a violation of CP symmetry.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.242001
DOI: 10.1103/PhysRevLett.96.242001
PACS: 13.30.Eg; 11.30.Er; 14.20.Jn
  • 13.30.Eg
    Hadronic decays of baryons
  • 11.30.Er
    Charge conjugation, parity, time reversal, and other discrete symmetries in particles and fields
  • 14.20.Jn
    Hyperons
  • YEAR: 2006

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