INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead and proton-proton collisions with the ATLAS detector
Autor/es:
F. MONTICELLI; ATLAS
Revista:
PHYSICAL REVIEW LETTERS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2016
ISSN:
0031-9007
Resumen:
Two-particle pseudorapidity correlations are measured in sNN−−−√ = 2.76 TeV Pb+Pb, sNN−−−√ = 5.02 TeV p+Pb, and s√ = 13 TeV pp collisions at the LHC, with total integrated luminosities of approximately 7 μb−1, 28 nb−1, and 65 nb−1, respectively. The correlation function CN(η1,η2) is measured as a function of event multiplicity using charged particles in the pseudorapidity range |η|<2.4. The correlation function contains a significant short-range component, which is estimated and subtracted. After removal of the short-range component, the shape of the correlation function is described approximately by 1+⟨a21⟩η1η2 in all collision systems over the full multiplicity range. The values of ⟨a21⟩−−−−√ are consistent between the opposite-charge pairs and same-charge pairs, and for the three collision systems at similar multiplicity. The values of ⟨a21⟩−−−−√ and the magnitude of the short-range component both follow a power-law dependence on the event multiplicity. The η distribution of the short-range component, after symmetrizing the proton and lead directions in p+Pb collisions, is found to be smaller than that in pp collisions with comparable multiplicity.