Studies of b-hadrons at LHCb

Abstract

A large data set collected at the LHCb experiment in proton-proton collisions during Runs 1 and 2 of the Large Hadron Collider has opened a unique possibility to study heavy beauty hadron states and to broaden knowledge of their spectroscopy and production. Recent results on searches for new excited $\mathrm{b}$-hadron states, and studies of $\mathrm{b}$-hadron production, are reviewed. In particular, the observation of new excited ${\Omega }_{\mathrm{b}}^{-}$ states, the observation of two new narrow ${\Lambda }_{\mathrm{b}}(6146{)}^0$ and ${\Lambda }_{\mathrm{b}}(6152{)}^0$ states, the observation of new ${\Lambda }_{\mathrm{b}}^{\ast \ast 0}$ state consistent with the ${\Lambda }_{\mathrm{b}}(2\mathrm{S}{)}^0$ prediction, a precise measurement of the mass and width of ${\Lambda }_{\mathrm{b}}(5912{)}^0$ and ${\Lambda }_{\mathrm{b}}(5920{)}^0$ states, and a measurement of the ${\mathrm{B}}_{\mathrm{c}}^{-}$ meson production fraction and ${\mathrm{B}}_{\mathrm{c}}^{-}-{\mathrm{B}}_{\mathrm{c}}^{+}$ production asymmetry in 7 and 13 TeV of proton-proton collisions are presented.

Talk at the 40th International Conference on High Energy Physics, Prague, Czech Republic, 28 July - 6 August 2020