Measurement of $\mathit{\Xi}_{cc}^{++}$ production in $pp$ collisions at $\sqrt{s}=13$ TeV

TL;DR

This paper reports the measurement of the production rate of the doubly charmed baryon $ ext{ extmu} ext{ extmu} ext{ extmu} ext{ extmu}$ in proton-proton collisions at 13 TeV, providing new data on its production cross-section relative to $ ext{ extmu} ext{ extmu} ext{ extmu} ext{ extmu}$ baryons.

Contribution

It presents the first measurement of the $ ext{ extmu} ext{ extmu} ext{ extmu} ext{ extmu}$ production cross-section ratio at 13 TeV, using LHCb data from 2016, with detailed analysis of decay channels and uncertainties.

Findings

Measured the ratio of $ ext{ extmu} ext{ extmu} ext{ extmu} ext{ extmu}$ to $ ext{ extmu} ext{ extmu} ext{ extmu} ext{ extmu}$ production cross-section.

Found the ratio to be approximately $(2.22 imes 10^{-4})$ with statistical and systematic uncertainties.

Provided data to test QCD predictions for doubly charmed baryon production.

Abstract

The production of $\mathit{\Xi}_{cc}^{++}$ baryons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV is measured in the transverse-momentum range $4<p_\mathrm{T}<15~\mathrm{GeV}$/$c$ and the rapidity range $2.0<y<4.5$. The data used in this measurement correspond to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$, recorded by the LHCb experiment during 2016. The ratio of the $\mathit{\Xi}_{cc}^{++}$ production cross-section times the branching fraction of the $\mathit{\Xi_{cc}^{++} \to \Lambda_{c}^{+} K^- \pi^+ \pi^+}$ decay relative to the prompt $\mathit{\Lambda_c^{+}}$ production cross-section is found to be $(2.22\pm 0.27 \pm 0.29)\times 10^{-4}$, assuming the central value of the measured $\mathit{\Xi_{cc}^{++}}$ lifetime, where the first uncertainty is statistical and the second systematic.