Measurement of D0 -> pilnu (Klnu) Form Factors and Absolute Branching Fractions
Abstract
Using a 282 1/fb data sample collected by the Belle experiment at the KEKB e+e- collider, we study D0 decays to K-l+nu and pi-l+nu final states. The D0 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 q2 = (pl+pnu)2. Normalizing to the total number of D0 tags, we measure the absolute branching fractions to be B(D0 -> Klnu) =(3.45 +- 0.07stat +- 0.20syst)% and B(D0 -> pilnu) = (0.255 +- 0.019stat +- 0.016syst)% and the semi-leptonic form factors (within the modified pole model) f+K(0) = 0.695 +- 0.007stat +- 0.022syst and f+pi(0) = 0.624 +- 0.020stat +- 0.030syst.
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