Measurement of Bottom-Quark Hadron Masses in Exclusive J/ψ Decays with the CDF Detector

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We measure the masses of $b$ hadrons in exclusively reconstructed final states containing a $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}$ decay using $220\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of data collected by the CDF II experiment. We find: $m({B}^{+})=5279.10\ifmmode\pm\else\textpm\fi{}{0.41}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{0.36}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, $m({B}^{0})=5279.63\ifmmode\pm\else\textpm\fi{}{0.53}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{0.33}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, $m({B}_{s}^{0})=5366.01\ifmmode\pm\else\textpm\fi{}{0.73}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{0.33}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, $m({\ensuremath{\Lambda}}_{b}^{0})=5619.7\ifmmode\pm\else\textpm\fi{}{1.2}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{1.2}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. $m({B}^{+})\ensuremath{-}m({B}^{0})=\ensuremath{-}0.53\ifmmode\pm\else\textpm\fi{}{0.67}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{0.14}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, $m({B}_{s}^{0})\ensuremath{-}m({B}^{0})=86.38\ifmmode\pm\else\textpm\fi{}{0.90}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{0.06}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, $m({\ensuremath{\Lambda}}_{b}^{0})\ensuremath{-}m({B}^{0})=339.2\ifmmode\pm\else\textpm\fi{}{1.4}_{(\mathrm{stat}.)}\ifmmode\pm\else\textpm\fi{}{0.1}_{(\mathrm{sys}.)}\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. The measurements of the ${B}_{s}^{0}$, ${\ensuremath{\Lambda}}_{b}^{0}$ mass, $m({B}_{s}^{0})\ensuremath{-}m({B}^{0})$ and $m({\ensuremath{\Lambda}}_{b}^{0})\ensuremath{-}m({B}^{0})$ mass difference are of better precision than the current world averages.

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