Observation of two resonances in the $\Lambda_b^0 \pi^\pm$ systems and precise measurement of $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ properties

TL;DR

This paper reports the first observation of two resonance structures in the $\Lambda_b^0 \pi^\pm$ systems and provides precise measurements of the properties of $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ baryons using LHCb data.

Contribution

It presents the first observation of two resonances in $\Lambda_b^0 \pi^\pm$ systems and offers precise measurements of $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ properties, advancing baryon spectroscopy.

Findings

Observation of two resonance structures in $\Lambda_b^0 \pi^\pm$ systems.

Precise measurements of $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ masses and widths.

Abstract

The first observation of two structures consistent with resonances in the final states $\Lambda_b^0 \pi^-$ and $\Lambda_b^0 \pi^+$ is reported using samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of 3 $\mathrm{fb}^{-1}$. The ground states $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ are also confirmed and their masses and widths are precisely measured.