Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions
Phys.Rev.Lett. 118 (2017) 052002
The collaboration

Abstract (data abstract)
CERN-LHC. Measurements of the cross-section for producing $b$ quarks in the reaction $pp \to b\bar{b}X$ are reported in 7 and 13 TeV collisions at the LHC as a function of the pseudorapidity $\eta$ in the range $2 < \eta < 5$ covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of $b$-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross-sections in the covered $\eta$ range are $72.0 \pm 0.3 \pm 6.8 \;\mu$b and $144 \pm 1 \pm 21 \;\mu$b for 7 and 13 TeV. The ratio is $2.00 \pm 0.02 \pm 0.26$, where the quoted uncertainties are statistical and systematic, respectively.