# Measurement of b-hadron fractions in 13 TeV pp collisions

## TL;DR

This paper reports precise measurements of b-hadron production fractions in 13 TeV proton-proton collisions, revealing dependencies on transverse momentum and providing key data for understanding heavy-flavor production at the LHC.

## Contribution

First measurement of b-hadron fractions in 13 TeV pp collisions using semileptonic decays, with detailed dependence on transverse momentum and pseudorapidity.

## Key findings

- Measured B_s^0 and Lambda_b^0 fractions with uncertainties.
- Lambda_b^0 ratio varies strongly with transverse momentum.
- B_s^0 ratio shows mild dependence on transverse momentum.

## Abstract

The production fractions of $\overline{B}_s^0$ and $\Lambda_b^0$ hadrons, normalized to the sum of $B^-$ and $\overline{B}^0$ fractions, are measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an integrated luminosity of 1.67/fb. These ratios, averaged over the $b$-hadron transverse momenta from 4 to 25 GeV and pseudorapidity from 2 to 5, are $0.122 \pm 0.006$ for $\overline{B}_s^0$, and $0.259 \pm 0.018$ for $\Lambda_b^0$, where the uncertainties arise from both statistical and systematic sources. The $\Lambda_b^0$ ratio depends strongly on transverse momentum, while the $\overline{B}_s^0$ ratio shows a mild dependence. Neither ratio shows variations with pseudorapidity. The measurements are made using semileptonic decays to minimize theoretical uncertainties. In addition, the ratio of $D^+$ to $D^0$ mesons produced in the sum of $\overline{B}^0$ and $B^-$ semileptonic decays is determined as $0.359\pm0.006\pm 0.009$, where the uncertainties are statistical and systematic.