237,278 research outputs found

    On integrable natural Hamiltonian systems on the suspensions of toric automorphism

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    We point out a mistake in the main statement of \cite{liu} and suggest and proof a correct statement.Comment: 5 pages, no figure

    Precision Measurements of the Semileptonic Charm Decays D0→π−ℓ+νD^0 \to \pi^- \ell^+ \nu and D0→K−ℓ+νD^0 \to K^- \ell^+ \nu

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    We investigate the decays D0→π−ℓ+νD^0\to\pi^-\ell^+\nu and D0→K−ℓ+νD^0\to K^-\ell^+ \nu, where ℓ\ell is ee or μ\mu, using approximately 7 fb−1{\rm fb}^{-1} of data collected with the CLEO III detector. We find R0≡B(D0→π−e+ν)/B(D0→K−e+ν)=0.082±0.006±0.005R_0\equiv {\cal B}(D^0\to \pi^-e^+\nu)/{\cal B}(D^0\to K^-e^+\nu)= 0.082 \pm 0.006 \pm 0.005. Fits to the kinematic distributions of the data provide parameters describing the form factor of each mode. Combining the form factor results and R0R_0 gives ∣f+π(0)∣2∣Vcd∣2/∣f+K(0)∣2∣Vcs∣2=0.038−0.007−0.003+0.006+0.005|f^{\pi}_{+}(0)|^2 |V_{cd}|^2/|f^K_{+}(0)|^2 |V_{cs}|^2 = 0.038^{+0.006+0.005}_{-0.007-0.003}.Comment: 5 pages, 2 figures, talk given at DPF'04, UC Riverside, C
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