2014/09/30 by LHCb collaboration, R. Aaij, B. Adeva +703 · 1 citation
Physics and Astronomy · #Analytical Chemistry (journal) #Astrophysics #Baryon #Collision #Computer science #High-Energy Particle Collisions Research #Luminosity #Nuclear physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.113.242002
published as Phys. Rev. Lett. 113, 242002 (2014) · 7 pages, 3 figures
arxiv created 2014/12/09 · openalex publication_date 2014/12/09 · arxiv updated 2014/12/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on measurements of the mass and lifetime of the \mathrm\ensuremathΞb^\ensuremath- baryon using about 1800 \mathrm\ensuremathΞb^\ensuremath- decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb^\ensuremath-1 collected by the LHCb experiment. The decays are reconstructed in the \mathrm\ensuremathΞb^\ensuremath-\ensuremath→\mathrm\ensuremathΞc0\ensuremathπ^\ensuremath-, \mathrm\ensuremathΞc0\ensuremath→pK^\ensuremath-K^\ensuremath-\ensuremathπ+ channel and the mass and lifetime are measured using the \mathrm\ensuremathΛb0\ensuremath→\mathrm\ensuremathΛc+\ensuremathπ^\ensuremath- mode as a reference. We measure M(\mathrm\ensuremathΞb^\ensuremath-)\ensuremath-M(\mathrm\ensuremathΛb0)=178.36\ifmmode±\else\textpm\fi0.46\ifmmode±\else\textpm\fi0.16 MeV/c2, (\ensuremathτ_\mathrm\ensuremathΞb^\ensuremath-/\ensuremathτ_\mathrm\ensuremathΛb0)=1.089\ifmmode±\else\textpm\fi0.026\ifmmode±\else\textpm\fi0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the \mathrm\ensuremathΞb^\ensuremath- mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.