This Letter reports on a new high precision measurement of the form factors of the KL → pi± μ+ νμ decay. The data sample of about 2.3×106 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear and a quadratic term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ0=(9.5±1.1stat±0.8syst)×10−3. Using a linear fit our results were: λ+=(26.7±0.6stat±0.8syst)×10−3 and λ0=(11.7±0.7stat±1.0syst)×10−3.
Measurement of K0(mu3) form factors
CONTALBRIGO, Marco;DALPIAZ, Pietro;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
2007
Abstract
This Letter reports on a new high precision measurement of the form factors of the KL → pi± μ+ νμ decay. The data sample of about 2.3×106 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear and a quadratic term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ0=(9.5±1.1stat±0.8syst)×10−3. Using a linear fit our results were: λ+=(26.7±0.6stat±0.8syst)×10−3 and λ0=(11.7±0.7stat±1.0syst)×10−3.File in questo prodotto:
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