Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-06-28
Phys. Rev. Lett. 105, 072002 (2010)
Physics
High Energy Physics
High Energy Physics - Experiment
Submitted in PRL: 12 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.105.072002
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.
Aamodt Authors: ALICE Collaboration: K.
Abel Nicholas
Abeysekara U.
Abramyan A. A.
Adamová D.
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