Charged-particle multiplicity measurement in proton-proton collisions at root s=7 TeV with ALICE at LHC
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- DE FALCO, ALESSANDRO
- FIONDA, FIORELLA MARIA CELESTE
- PUDDU, GIOVANNA
- USAI, GIANLUCA
Publication date
January 2010
DOIAbstract
The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy root s = 7 TeV, were measured in the central pseudorapidity region vertical bar eta vertical bar < 1. Comparisons are made with previous measurements at root s = 0.9 TeV and 2.36 TeV. At root s = 7 TeV, for events with at least one charged particle in |eta vertical bar| < 1, we obtain dN(ch)/d eta = 6.01 +/- 0.01(stat.)(-0.12)(+0.20) (syst.). This corresponds to an increase of 57.6%+/-0.4%(stat.)(-1.8%)(+3.6) (syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the neg...
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