Phys. Rev. Lett. 87, 132001 (2001) [4 pages]
First Measurement of Form Factors of the Decay Ξ0 → Σ+e-ν̅ e
A. Alavi-Harati et al. (KTeV Collaboration)
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A. Alavi-Harati12, T. Alexopoulos12, M. Arenton11, K. Arisaka2, S. Averitte10, R. F. Barbosa7 *, A. R. Barker5, M. Barrio4, L. Bellantoni7, A. Bellavance9, J. Belz10, R. Ben-David7, D. R. Bergman10, E. Blucher4, G. J. Bock7, C. Bown4, S. Bright4, E. Cheu1, S. Childress7, R. Coleman7, M. D. Corcoran9, G. Corti11, B. Cox11, M. B. Crisler7, A. R. Erwin12, R. Ford7, A. Glazov4, A. Golossanov11, G. Graham4, J. Graham4, K. Hagan11, E. Halkiadakis10, J. Hamm1, K. Hanagaki8, S. Hidaka8, Y. B. Hsiung7, V. Jejer11, D. A. Jensen7, R. Kessler4, H. G. E. Kobrak3, J. LaDue5, A. Lath10, A. Ledovskoy11, P. L. McBride7, P. Mikelsons5, E. Monnier4 †, T. Nakaya7, K. S. Nelson11, H. Nguyen7, V. O'Dell7, M. Pang7, R. Pordes7, V. Prasad4, X. R. Qi7, B. Quinn4, E. J. Ramberg7, R. E. Ray7, A. Roodman4, M. Sadamoto8, S. Schnetzer10, K. Senyo8, P. Shanahan7, P. S. Shawhan4, J. Shields11, W. Slater2, N. Solomey4, S. V. Somalwar10, R. L. Stone10, E. C. Swallow4,6, S. A. Taegar1, R. J. Tesarek10, G. B. Thomson10, P. A. Toale5, A. Tripathi2, R. Tschirhart7, S. E. Turner2, Y. W. Wah4, J. Wang1, H. B. White7, J. Whitmore7, B. Winstein4, R. Winston4 ‡, T. Yamanaka8, and E. D. Zimmerman4 (KTeV Collaboration)
1University of Arizona, Tucson, Arizona 85721
2University of California at Los Angeles, Los Angeles, California 90095
3University of California at San Diego, La Jolla, California 92093
4The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
5University of Colorado, Boulder, Colorado 80309
6Elmhurst College, Elmhurst, Illinois 60126
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510
8Osaka University, Toyonaka, Osaka 560-0043 Japan
9Rice University, Houston, Texas 77005
10Rutgers University, Piscataway, New Jersey 08854
11The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901
12University of Wisconsin, Madison, Wisconsin 53706
Received 10 May 2001; published 11 September 2001
We present the first measurement of the form factor ratios g1/f1 (direct axial vector to vector), g2/f1 (second class current), and f2/f1 (weak magnetism) for the decay Ξ0→Σ+e-ν̅ e using the KTeV (E799) beam line and detector at Fermilab. From the Σ+ polarization measured with the decay Σ+→pπ0 and the e--ν̅ correlation, we measure g1/f1 to be 1.32±0.170.21(stat)±0.05(syst), assuming the SU(3)f (flavor) values for g2/f1 and f2/f1. Our results are all consistent with exact SU(3)f symmetry.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v87/e132001
DOI: 10.1103/PhysRevLett.87.132001
PACS: 13.30.Ce, 14.20.Jn
* Permanent address: University of São Paulo, São Paulo, Brazil.
† Permanent address: C.P.P. Marseille/C.N.R.S., France.
‡ To whom correspondence should be addressed.Electronic address: r-winston@uchicago.edu
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