Measurements of semileptonic K{sub L} decay form factors
- University of Wisconsin, Madison, Wisconsin 53706 (United States)
- Department of Physics and Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States); and others
We present new measurements of K{sub L} semileptonic form factors using data collected in 1997 by the KTeV (E832) experiment at Fermilab. The measurements are based on 1.9x10{sup 6} K{sub L}{yields}{pi}{sup {+-}}e{sup {+-}}{nu} and 1.5x10{sup 6} K{sub L}{yields}{pi}{sup {+-}}{mu}{sup {+-}}{nu} decays. For f{sub +}(t), we measure both a linear and quadratic term: {lambda}{sub +}{sup '}=(20.64{+-}1.75)x10{sup -3} and {lambda}{sub +}{sup ''}=(3.20{+-}0.69)x10{sup -3}. For f{sub 0}(t), we find {lambda}{sub 0}=(13.72{+-}1.31)x10{sup -3}. These form factors are consistent with K{sup {+-}} 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, I{sub K}{sup e}=0.15350{+-}0.00105 and I{sub K}{sup {mu}}=0.10165{+-}0.00080, where errors include uncertainties arising from the form factor parametrizations.
- OSTI ID:
- 20705577
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 70, Issue 9; Other Information: DOI: 10.1103/PhysRevD.70.092007; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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