$\pt$-differential production cross section of $\mathrm{B^0}$ mesons measured at midrapidity ($|y|< 0.5$) in pp collisions at $\sqrt{s}=13.6$ $\mathrm{TeV}$ compared with $k_\mathrm{T}$-factorisation  calculations. The contributions to the predicted $\mathrm{B^0}$ production cross section arising from gluon and beauty-quark fragmentation into a $\mathrm{B^0}$ meson are also shown. Statistical uncertainties are depicted as vertical error bars, and systematic uncertainties as boxes. The systematic uncertainties related to normalisation are quoted separately as text.