, 72:2168,
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Date: 05 Oct 2012

Measurement of prompt hadron production ratios in pp collisions at \(\sqrt{s} = 0.9\mbox{ and }7~\mathrm{TeV}\)

Abstract

The charged-particle production ratios \(\bar{p}/p\) , K /K +, π /π +, \((p + \bar{p})/(\pi^{+} + \pi^{-})\) , (K ++K )/(π ++π ) and \((p + \bar{p})/(K^{+} + K^{-})\) are measured with the LHCb detector using 0.3 nb−1 of pp collisions delivered by the LHC at \(\sqrt{s} = 0.9~\mathrm{TeV}\) and 1.8 nb−1 at \(\sqrt{s} = 7~\mathrm{TeV}\) . The measurements are performed as a function of transverse momentum p T and pseudorapidity η. The production ratios are compared to the predictions of several Monte Carlo generator settings, none of which are able to describe adequately all observables. The ratio \(\bar{p}/p\) is also considered as a function of rapidity loss, Δyy beamy, and is used to constrain models of baryon transport.