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

Abstract

The production of $\hat{I}{ž}_{cc}^{++}$ 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 $\hat{I}{ž}_{cc}^{++}$ production cross-section times the branching fraction of the $\hat{I}{ž}_{cc}^{++}\to \hat{I}{›}_c^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}$ decay relative to the prompt $\hat{I}{›}_c^{+}$ 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 $\hat{I}{ž}_{cc}^{++}$ lifetime, where the first uncertainty is statistical and the second systematic.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-035.html