Midrapidity antiproton-to-proton ratio in pp collisions at sqrt(s) = 0.9 and 7 TeV measured by the ALICE experiment

K. Aamodt, M. Chojnacki, P. Christakoglou, R. S. de Rooij, A. Grelli, C.G. Ivan, R. Kamermans, A. Mischke, G.J.L. Nooren, T. Peitzmann, E. Simili, M. van Leeuwen, M. Verweij

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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 $0.45 <p_{\rm{t}} <1.05$~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
Original languageEnglish
Article number072002
Pages (from-to)1-12
Number of pages12
JournalPhysical Review Letters
Volume105
Issue number7
DOIs
Publication statusPublished - 13 Aug 2010

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