Midrapidity antiproton-to-proton ratio in pp collisions at $\sqrt{s}=0.9$ and $7$ TeV measured by the ALICE experiment

Abstract

The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at $\sqrt{s}=0.9$ and $7$ TeV during the initial running periods of the Large Hadron Collider(LHC). The measurement covers the transverse momentum interval $0.45<p_{\mathrm{t}}<1.05$ GeV/$c$ and rapidity $|y|<0.5$. The ratio is measured to be $R_{|y|<0.5}=0.957\pm 0.006(stat.)\pm 0.014(syst.)$ at $0.9$ TeV and $R_{|y|<0.5}=0.991\pm 0.005(stat.)\pm 0.014(syst.)$ at $7$ TeV and it is independent of both rapidity and transverse momentum. The results are consistent with the conventional model of baryon-number transport and set stringent limits on any additional contributions to baryon-number transfer over very large rapidity intervals in pp collisions.

12 pages, 4 captioned figures, 2 tables, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3905

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