Measurement of $D^{0} \to π l ν (K l ν)$ Form Factors and Absolute Branching Fractions

11 August 2006

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 97 (6) , 061804
https://doi.org/10.1103/physrevlett.97.061804

Abstract

Using a

282 {fb}^{- 1}

data sample collected by the Belle experiment at the KEKB

e^{+} e^{-}

collider, we study

D^{0}

decays to

K^{-} ℓ^{+} ν

and

π^{-} ℓ^{+} ν

final states. The

D^{0}

flavor and momentum are tagged through a full reconstruction of the recoiling charm meson and additional mesons from fragmentation. The reconstruction method provides very good resolution in neutrino momentum and in

q^{2} = (p_{ℓ} + p_{ν})^{2}

. Normalizing to the total number of

D^{0}

tags, we measure the absolute branching fractions to be

B (D^{0} \to K ℓ ν) = (3.45 \pm {0.07}_{stat} \pm {0.20}_{syst}) %

and

B (D^{0} \to π ℓ ν) = (0.255 \pm {0.019}_{stat} \pm {0.016}_{syst}) %

and the semileptonic form factors (within the modified pole model)

f_{+}^{K} (0) = 0.695 \pm {0.007}_{stat} \pm {0.022}_{syst}

and

f_{+}^{π} (0) = 0.624 \pm {0.020}_{stat} \pm {0.030}_{syst}

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This publication has 16 references indexed in Scilit:

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Physical Review Letters, 2005
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Measurement ofD0→πlν(Klν)Form Factors and Absolute Branching Fractions

Abstract

Keywords

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Measurement of $D^{0} \to π l ν (K l ν)$ Form Factors and Absolute Branching Fractions