Measurements of semileptonic KL decay form factors

T. Alexopoulos, M. Arenton, R. F. Barbosa, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, E. Cheu, S. Childress, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, R. Ford, A. Glazov, A. Golossanov, J. Graham, J. Hamm, K. HanagakiY. B. Hsiung, H. Huang, V. Jejer, D. A. Jensen, R. Kessler, H. G.E. Kobrak, K. Kotera, J. LaDue, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, R. Niclasen, V. Prasad, X. R. Qi, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, P. Shanahan, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, R. J. Tesarek, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman

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Abstract

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±eν and 1.5 × 106 KL → π±μν 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 I Kμ = 0.10165 ± 0.00080, where errors include uncertainties arising from the form factor parametrizations.

Original languageEnglish (US)
Article number092007
Pages (from-to)092007-1-092007-15
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number9
DOIs
StatePublished - Nov 1 2004

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Alexopoulos, T., Arenton, M., Barbosa, R. F., Barker, A. R., Bellantoni, L., Bellavance, A., Blucher, E., Bock, G. J., Cheu, E., Childress, S., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Ford, R., Glazov, A., Golossanov, A., Graham, J., Hamm, J., ... Zimmerman, E. D. (2004). Measurements of semileptonic KL decay form factors. Physical Review D - Particles, Fields, Gravitation and Cosmology, 70(9), 092007-1-092007-15. [092007]. https://doi.org/10.1103/PhysRevD.70.092007