Measurement of the $\bar{p}/{p}$ ratio in LHCb at $\sqrt{s}$ = 900 GeV and 7 TeV

Preliminary measurements are performed of $\bar{p}/p$, the ratio of the yields of antiprotons to protons in $pp$ collisions, at $\sqrt{s}=900$~GeV and $7$~TeV, as a function of pseudorapidity, $\eta$, rapidity, $y$, and transverse momentum, $p_{\rm T}$. When compared with generator expectations, some differences are found at the lower energy point. The results are also presented in terms of the rapidity loss, $\Delta y$. Compatibility with previous measurements is observed, together with an indication of $p_{\rm T}$ dependence.