Measurement of the Production Cross Section of $B^{+}$ Meson at CERN-ATLAS Experiment with $\sqrt{s}= 13$ TeV Data

The differential cross section of $B^{+}$ meson is presented as a function of transverse momentum and pseudorapidity. It is determined from the channel $B^{+}\rightarrow J/\psi K^{+}$ and reconstructed with using ATLAS $pp$ collision dataset, Run2 2015 data with integrated luminosity of 3.2 $fb^{-1}$. Measurement is done for 8 intervals of transverse momentum $p_{T}$ and 4 intervals of rapidity $|y|$ covering the range 9 GeV < $p_{T}$ < 120 GeV and $|y|< $ 2.25. $B^{+}$ / $B^{-}$ ratio is consistent with MC and 13 TeV / 7 TeV cross-section ratio is consistent with the theoretical expectations.