Precision measurement of D meson mass differences

Abstract

Using three- and four-body decays of $D$ mesons produced in semileptonic $b$-hadron decays, precision measurements of $D$ meson mass differences are made together with a measurement of the $D^0$ mass. The measurements are based on a dataset corresponding to an integrated luminosity of $1.0f{b}^{-1}$ collected in $pp$ collisions at 7\,TeV. Using the decay $D^0\to K^{+}{K}^{-}{K}^{-}{\pi }^{+}$, the $D^0$ mass is measured to be $M(D^0) &=& 1864.75 \pm 0.15 \,({\rm stat}) \pm 0.11 \,({\rm syst}) \, \textrm{MeV/c^2}$. The mass differences $M(D^{+}) - M(D^{0}) = 4.76 \pm 0.12 \,({\rm stat}) \pm 0.07 \,({\rm syst}) \, \textrm{MeV/c^2}$ and $M(D^{+}_s) - M(D^{+}) = 98.68 \pm 0.03 \,({\rm stat}) \pm 0.04 \,({\rm syst}) \, \textrm{MeV/c^2}$ are measured using the $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ and $D_{(s)}^{+}\to K^{+}{K}^{-}{\pi }^{+}$ modes.

Journal of High Energy Physics, Volume 2013, Issue 6

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• Determination of the X(3872) meson quantum numbers
• Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV
• Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses
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• Observation of $B_c^{+}\to J/\psi D_s^{+}$ and $B_c^{+}\to J/\psi D_s^{\ast +}$ decays

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