Precise measurement of the $D^0$ and $D^{+}$ lifetimes at Belle II

Abstract

We report a measurement of the $D^0$ and $D^{+}$ lifetimes using $D^0\to K^{-}{\pi }^{+}$ and $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$ decays reconstructed in $e^{+}{e}^{-}\to c\bar{c}$ data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The data, collected at center-of-mass energies at or near the ${\rm Y}(4S)$ resonance, correspond to an integrated luminosity of $72{\mathrm{fb}}^{-1}$. The results, $\tau (D^0)=410.5\pm 1.1(\mathrm{stat})\pm 0.8(syst.)\mathrm{fs}$ and $\tau (D^{+})=1030.4\pm 4.7(\mathrm{stat})\pm 3.1(syst.)\mathrm{fs}$, are the most precise to date and are consistent with previous determinations.

arXiv comment9 pages, 2 figures

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Cited by in corpus (4)

• Measurement of the ${\Lambda }_c^{+}$ lifetime
• Search for time-dependent $CP$ violation in $D^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$ decays
• Measurement of $CP$ violation in $B^0\to K_S^0{\pi }^0$ decays at Belle II
• Transforming jet flavour tagging at ATLAS