Measurements of semileptonic K(L) decay form-factors

Alexopoulos, T.

doi:10.1103/PhysRevD.70.092007

Measurements of semileptonic K(L) decay form-factors

Journal Article · Tue Jun 01 04:00:00 EDT 2004 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.70.092007· OSTI ID:1863008

Alexopoulos, T.

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 1.9 million KL->pi e nu and 1.5 million KL->pi mu nu decays. For f+(t), we measure both a linear and quadratic term lambda+' = (20.64 +- 1.75)E-3 and lambda+'' = (3.20 +- 0.69)E-3. For f0(t), we find lambda0 = (13.72 +- 1.31)E-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, IK(e) = 0.15350 +- 0.00105 and IK(mu) =0.10165 +- 0.00080, where errors include uncertainties arising from the form factor parametrizations.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: KTeV

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1863008

Report Number(s):: FERMILAB-PUB-04-161-E; arXiv:hep-ex/0406003; oai:inspirehep.net:651416

Journal Information:: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 70

Country of Publication:: United States

Language:: English

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