Studies of b-hadrons at LHCb

TL;DR

This paper reviews recent experimental results from LHCb on heavy b-hadron spectroscopy and production, including discovery of new states and precise measurements of known particles, enhancing understanding of heavy flavor physics.

Contribution

It reports the observation of new excited b-hadron states and provides precise measurements of their properties, advancing the field of heavy hadron spectroscopy.

Findings

Discovery of new excited $ ext{Ω}_b^-$ states

Observation of two narrow $ ext{Λ}_b$ states at 6146 and 6152 MeV

Precise measurements of $ ext{Λ}_b$ states' mass and width

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 $\Lambda_{\mathrm{b}}^{**0}$ 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.