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

We measure the masses of

b

hadrons in exclusively reconstructed final states containing a

J / ψ \to μ^{-} μ^{+}

decay using

220 {pb}^{- 1}

of data collected by the CDF II experiment. We find:

m (B^{+}) = 5279.10 \pm {0.41}_{(stat .)} \pm {0.36}_{(sys .)} MeV / c^{2}

m (B^{0}) = 5279.63 \pm {0.53}_{(stat .)} \pm {0.33}_{(sys .)} MeV / c^{2}

m (B_{s}^{0}) = 5366.01 \pm {0.73}_{(stat .)} \pm {0.33}_{(sys .)} MeV / c^{2}

m (Λ_{b}^{0}) = 5619.7 \pm {1.2}_{(stat .)} \pm {1.2}_{(sys .)} MeV / c^{2}

m (B^{+}) - m (B^{0}) = - 0.53 \pm {0.67}_{(stat .)} \pm {0.14}_{(sys .)} MeV / c^{2}

m (B_{s}^{0}) - m (B^{0}) = 86.38 \pm {0.90}_{(stat .)} \pm {0.06}_{(sys .)} MeV / c^{2}

m (Λ_{b}^{0}) - m (B^{0}) = 339.2 \pm {1.4}_{(stat .)} \pm {0.1}_{(sys .)} MeV / c^{2}

. The measurements of the

B_{s}^{0}

Λ_{b}^{0}

mass,

m (B_{s}^{0}) - m (B^{0})

and

m (Λ_{b}^{0}) - m (B^{0})

mass difference are of better precision than the current world averages.

This publication has 16 references indexed in Scilit:

$B$ -Meson Decay Constant from Unquenched Lattice QCD
Physical Review Letters, 2005
Charmed-Meson Decay Constants in Three-Flavor Lattice QCD
Physical Review Letters, 2005
Mass of the $B_{c}$ Meson in Three-Flavor Lattice QCD
Physical Review Letters, 2005
Measurement of the $J / ψ$ meson and $b$ -hadron production cross sections in $p \bar{p}$ collisions at $\sqrt{s} = 1960 G e V$
Physical Review D, 2005
CDF Central Outer Tracker
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004
High-Precision Lattice QCD Confronts Experiment
Physical Review Letters, 2004
Online track processor for the CDF upgrade
IEEE Transactions on Nuclear Science, 2002
CDF Run II silicon tracking projects
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2000
CDF central muon detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1988
Observation of a Dimuon Resonance at 9.5 GeV in 400-GeV Proton-Nucleus Collisions
Physical Review Letters, 1977

Measurement of Bottom-Quark Hadron Masses in ExclusiveJ/ψDecays with the CDF Detector