Phys. Rev. D 70, 092007 (2004) [15 pages]
Measurements of semileptonic KL decay form factors
T. Alexopoulos et al. The KTeV Collaboration
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T. Alexopoulos11, M. Arenton10, R. F. Barbosa7 *, A. R. Barker5 †, L. Bellantoni7, A. Bellavance9, E. Blucher4, G. J. Bock7, E. Cheu1, S. Childress7, R. Coleman7, M. D. Corcoran9, B. Cox10, A. R. Erwin11, R. Ford7, A. Glazov4, A. Golossanov10, J. Graham4, J. Hamm1, K. Hanagaki8, Y. B. Hsiung7, H. Huang5, V. Jejer10, D. A. Jensen7, R. Kessler4, H. G. E. Kobrak3, K. Kotera8, J. LaDue5, A. Ledovskoy10, P. L. McBride7, E. Monnier4 ‡, K. S. Nelson10, H. Nguyen7, R. Niclasen5, V. Prasad4, X. R. Qi7, E. J. Ramberg7, R. E. Ray7, M. Ronquest10, E. Santos7, P. Shanahan7, J. Shields10, W. Slater2, D. Smith10, N. Solomey4, E. C. Swallow4,6, R. J. Tesarek7, P. A. Toale5, R. Tschirhart7, Y. W. Wah4, J. Wang1, H. B. White7, J. Whitmore7, M. Wilking5, B. Winstein4, R. Winston4, E. T. Worcester4, T. Yamanaka8, and E. D. Zimmerman5 (The KTeV Collaboration)
1University of Arizona, Tucson, Arizona 85721, USA
2University of California at Los Angeles, Los Angeles, California 90095, USA
3University of California at San Diego, La Jolla, California 92093, USA
4The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
5University of Colorado, Boulder, Colorado 80309, USA
6Elmhurst College, Elmhurst, Illinois 60126, USA
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
8Osaka University, Toyonaka, Osaka 560-0043 Japan
9Rice University, Houston, Texas 77005, USA
10The Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901, USA
11University of Wisconsin, Madison, Wisconsin 53706, USA
Received 1 June 2004; published 16 November 2004
We present new measurements of KL semileptonic form factors using data collected in 1997 by the KTeV (E832) experiment at Fermilab. The measurements are based on 1.9×106 KL→π±e∓ν and 1.5×106 KL→π±μ∓ν decays. For f+(t), we measure both a linear and quadratic term: λ+′=(20.64±1.75)×10-3 and λ+′′=(3.20±0.69)×10-3. For f0(t), we find λ0=(13.72±1.31)×10-3. These form factors are consistent with K± form factors, suggesting that isospin symmetry breaking effects are small. We use our measured values of the form factors to evaluate the decay phase space integrals, IKe=0.15350±0.00105 and IKμ=0.10165±0.00080, where errors include uncertainties arising from the form factor parametrizations.
©2004 The American Physical Society
URL: http://link.aps.org/abstract/PRD/v70/e092007
DOI: 10.1103/PhysRevD.70.092007
PACS: 13.20.Eb
* Permanent address: University of São Paulo, São Paulo, Brazil
† Deceased.
‡ Permanent address: C.P.P. Marseille/C.N.R.S., France
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