Title

Measurement of the decay asymmetry parameters in 5"-H IT+

Authors

S. Chan, California Institute of Technology
G. Eigen, California Institute of Technology
E. Lipeles, California Institute of Technology
J. S. Miller, California Institute of Technology
M. Schmidtler, California Institute of Technology
A. Shapiro, California Institute of Technology
W. M. Sun, California Institute of Technology
J. Urheim, California Institute of Technology
A. J. Weinstein, California Institute of Technology
F. Würthwein, California Institute of Technology
D. E. Jaffe, University of California, San Diego
G. Masek, University of California, San Diego
H. P. Paar, University of California, San Diego
E. M. Potter, University of California, San Diego
S. Prell, University of California, San Diego
V. Sharma, University of California, San Diego
D. M. Asner, University of California, Santa Barbara
A. Eppich, University of California, Santa Barbara
J. Gronberg, University of California, Santa Barbara
T. S. Hill, University of California, Santa Barbara
D. J. Lange, University of California, Santa Barbara
R. J. Morrison, University of California, Santa Barbara
H. N. Nelson, University of California, Santa Barbara
T. K. Nelson, University of California, Santa Barbara
D. Roberts, University of California, Santa Barbara
B. H. Behrens, University of Colorado Boulder
W. T. Ford, University of Colorado Boulder
A. Gritsan, University of Colorado Boulder
H. Krieg, University of Colorado Boulder
J. Roy, University of Colorado Boulder
J. G. Smith, University of Colorado Boulder
J. P. Alexander, Cornell University
R. Baker, Cornell University

Document Type

Article

Publication Date

1-1-2001

Abstract

Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξ decay asymmetry parameter in the decay Ξ →Ξ π . We find α α = -0.26±0.18(stat) (syst); using the world average value of α = -0.456±0.014 we obtain a=o=-0.56±0.39(stat) (syst). The physically allowed range of a decay asymmetry parameter is -1<α<+1. Our result prefers a negative value: α is <0.1 at the 90% C.L. The central value occupies the middle of the theoretically expected range but is not yet precise enough to choose between models. ©2001 The American Physical Society. c c ξ c Ξ -0.04 Ξ -0.09 ξ c 0 0 - + 0 +0.05 +0.10 0

Publication Name

Physical Review D

Volume Number

63

Issue Number

11

DOI

10.1103/PhysRevD.63.111102

Article

111102

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