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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 $1.0 fb^{-1}$ collected in $pp$ collisions at 7\,TeV. Using the decay $D^0 \rightarrow K^{+} K^{-} K^{-} \pi^{+}$, 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 $D^0 \rightarrow K^{+} K^{-} \pi^{+} \pi^{-}$ and $D^{+}_{(s)} \rightarrow K^{+}K^{-} \pi^{+}$ modes.
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Contributor : Sabine Starita <>
Submitted on : Friday, April 26, 2013 - 10:30:55 AM
Last modification on : Wednesday, September 16, 2020 - 4:19:53 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Precision measurement of D meson mass differences. Journal of High Energy Physics, Springer, 2013, 06, pp.065. ⟨10.1007/JHEP06(2013)065⟩. ⟨in2p3-00818150⟩



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