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Midrapidity antiproton-to-proton ratio in pp collisons at √s=0.9 and 7 TeV measured by the ALICE experiment

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The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at √s=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45<pt<1.05 GeV/c and rapidity |y|<0.5....

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Main Authors: Aamodt, Kenneth (Author) , Angelov, Venelin (Author) , Busch, Oliver (Author) , Glässel, Peter (Author) , Grajcarek, Robert (Author) , Herrmann, Norbert (Author) , Klein, Jochen (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Schicker, Rainer (Author) , Schweda, Kai (Author) , Soltveit, Hans Kristian (Author) , Stachel, Johanna (Author) , Vallero, Sara (Author) , Windelband, Bernd (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 12 August 2010
In: Physical review letters
Year: 2010, Volume: 105, Issue: 7, Pages: 1-12
ISSN:1079-7114
DOI:10.1103/PhysRevLett.105.072002
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.105.072002
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.105.072002
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Author Notes:K. Aamodt et al. (ALICE Collaboration)*
Description
Summary:The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at √s=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45<pt<1.05 GeV/c and rapidity |y|<0.5. The ratio is measured to be R|y|<0.5=0.957±0.006(stat)±0.014(syst) at 0.9 TeV and R|y|<0.5=0.991±0.005(stat)±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.
Item Description:*ALICE Collaboration: K. Aamodt, V. Angelov, O. Busch, P. Glässel, R. Grajcarek, N. Herrmann, J. Klein, J. Mercado Pérez, K. Oyama, Y. Pachmayer, R. Schicker, K. Schweda, H.K. Soltveit, J. Stachel, S. Vallero, B. Windelband [und 1045 weitere Personen]
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.105.072002

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