Midrapidity Antiproton-to-Proton Ratio in pp Collisons root s=0.9 and 7 TeV Measured by the ALICE Experiment

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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 root 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 < p(t) < 1.05 GeV/c and rapidity vertical bar y vertical bar < 0.5. The ratio is measured to be R(vertical bar y vertical bar<0.5) = 0.957 +/- 0.006(stat) +/- 0.0014(syst) at 0.9 Tev and R(vertical bar y vertical bar<0.5) = 0.991 +/- 0.005 +/- 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.

Autore Pugliese

Tutti gli autori

  • FIORE E.M.

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Non Disponibile

Anno di pubblicazione

2010

ISSN

0031-9007

ISBN

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Numero di citazioni Wos

67

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Settori ERC

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