Absolute Branching Fraction Measurements for D^+ and D^0 Inclusive Semileptonic Decays

Details Absolute Branching Fraction Measurements for D^+ and D^0 Inclusive Semileptonic Decays Absolute Branching Fraction Measurements for D^+ and D^0 Inclusive Semileptonic Decays

2006-04-21

arxiv.org/abs/hep-ex/0604044v4

Phys.Rev.Lett.97:251801,2006

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages postscript,also available through this http://www.lns.cornell.edu/public/CLNS/2006/

Scientific paper

10.1103/PhysRevLett.97.251801

We present measurements of the inclusive branching fractions for the decays D^+ -> X e^+ nu_e and D^0 -> X e^+ nu_e, using 281 pb^-1 of data collected on the psi(3770) resonance with the CLEO-c detector. We find Br(D^0 ->Xe^+\nu_e) = (6.46 \pm 0.17 \pm 0.13)% and Br((D^+ -> Xe^+nu_e) = (16.13 \pm 0.20 \pm 0.33)%. Using the known D meson lifetimes, we obtain the ratio Gamma{D^+}^sl/Gamma_{D^0}^sl= 0.985\pm 0.028\pm 0.015, confirming isospin invariance at the level of 3%. The positron momentum spectra from D^+ and D^0 have consistent shapes.

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