The first data-driven determination of the HQET parameters mu_pi^2, mu_G^2, rho_D^3 and rho_LS^3 for D0, D+ and Ds mesons is obtained from inclusive semileptonic decay widths and electron energy moments.
Precise measurement of the $D^+_s$ lifetime at Belle II
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abstract
We measure the lifetime of the $D_s^+$ meson using a data sample of 207 fb$^{-1}$ collected by the Belle II experiment running at the SuperKEKB asymmetric-energy $e^+ e^-$ collider. The lifetime is determined by fitting the decay-time distribution of a sample of $116\times 10^3$ $D_s^+\rightarrow\phi\pi^+$ decays. Our result is $\tau^{}_{D^+_s} = (499.5\pm 1.7\pm 0.9)$ fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.
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Data determination of HQET parameters in inclusive charm decays
The first data-driven determination of the HQET parameters mu_pi^2, mu_G^2, rho_D^3 and rho_LS^3 for D0, D+ and Ds mesons is obtained from inclusive semileptonic decay widths and electron energy moments.