ﻻ يوجد ملخص باللغة العربية
Bottom baryons decaying to a J/psi meson and a hyperon are reconstructed using 1.0 fb^{-1} of data collected in 2011 with the LHCb detector. Significant Lambda_b^0 rightarrow J/psi Lambda, Xi_b^-rightarrow J/psi Xi^- and Omega_b^- rightarrow J/psi Omega^- signals are observed and the corresponding masses are measured to be M(Lambda_b^0) = 5619.53 pm 0.13 (stat) pm 0.45 (syst) MeV/c^2, M(Xi_b^-) = 5795.8 pm 0.9 (stat) pm 0.4 (syst) MeV/c^2, M(Omega_b^-) = 6046.0 pm 2.2 (stat) pm 0.5 (syst) MeV/c^2, while the differences with respect to the Lambda_b^0 mass are M(Xi_b^-)-M(Lambda_b^0) = 176.2 pm 0.9 (stat) pm 0.1 (syst) MeV/c^2, M(Omega_b^-)-M(Lambda_b^0) = 426.4 pm 2.2 (stat) pm 0.4 (syst) MeV/c^2. These are the most precise mass measurements of the Lambda_b^0, Xi_b^- and Omega_b^- baryons to date. Averaging the above Lambda_b^0 mass measurement with that published by LHCb using 35 pb^{-1} of data collected in 2010 yields M(Lambda_b^0) = 5619.44 pm 0.13 (stat) pm 0.38 (syst) MeV/c^2.
Using a data sample of pp collisions corresponding to an integrated luminosity of $3~ rm fb^{-1}$, the $Xi_b^-$ and $Omega_b^-$ baryons are reconstructed in the $Xi_b^- rightarrow J/psi Xi^-$ and $Omega_b^- rightarrow J/psi Omega^-$ decay modes and t
We perform a search for near-threshold $Xi_b^0$ resonances decaying to $Xi_b^- pi^+$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. We observe one resonant state,
A search for charmless four-body decays of $Lambda_{b}^{0}$ and $Xi_{b}^{0}$ baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The data sample used was recorded in 2011 and 2012 with the LHCb expe
Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 $Xi_b^0toXi_c^+pi^-$, $Xi_c^+to pK^-pi^+$ signal decays are reconstructed. Fr
The decays $ Lambda_b^0 to psi(2S)pK^-$ and $ Lambda_b^0 to J/psi pi^+ pi^- pK^-$ are observed in a data sample corresponding to an integrated luminosity of 3fb$^{-1}$, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies by th