LHCb early measurements focusing on B and charm production

Measurements of the production cross-sections of prompt $J/\psi$, $D^{0}$, $D^{+}$, $D_{s}^{+}$, and $D^{*+}$ mesons are presented, using proton-proton collision data taken at a centre-of-mass energy of $\sqrt{s} = 13\,\text{TeV}$ with the LHCb detector. The cross-section measurements are made in bins of meson transverse momentum $p_{\text{T}}$ and rapidity $y$, up to a $p_{\text{T}}$ of $14\,\text{GeV}$ for the $J/\psi$ measurements and $15\,\text{GeV}$ for the open charm meson measurements, both in the rapidity range $2.0 < y < 4.5$. The integrated $c\bar{c}$ cross-section is measured using the open charm results and known fragmentation fractions, and the $b\bar{b}$ cross-section is measured using an additional measurement of $J/\psi$ production from $b$-decays. Several ratios of cross-sections with respect to $\sqrt{s} = 7\,\text{TeV}$ and $\sqrt{s} = 8\,\text{TeV}$ are also determined.