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.
|Titolo:||Midrapidity Antiproton-to-Proton ratio in pp Collisons at sqrt s=0.9 and 7 TeV measured by the ALICE experiment|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.105.072002|
|Appare nelle tipologie:||1.1 Articolo in rivista|