INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at √sNN = 2.76 TeV with the ATLAS detector
Autor/es:
ATLAS COLLABORATION, G. AAD, F. MONTICELLI, ET AL
Revista:
PHYSICS LETTERS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 231 p. 1 - 23
ISSN:
0370-2693
Resumen:
The ATLAS experiment at the LHC has measured the centrality dependence
of charged particle pseudorapidity distributions over |eta| < 2 in
lead-lead collisions at a nucleon-nucleon centre-of-mass energy of
sqrt(s_NN) = 2.76 TeV. In order to include particles with transverse
momentum as low as 30 MeV, the data were recorded with the central
solenoid magnet off. Charged particles were reconstructed with two
algorithms (2-point 'tracklets' and full tracks) using information from
the pixel detector only. The lead-lead collision centrality was
characterized by the total transverse energy in the forward calorimeter
in the range 3.2 < |eta| < 4.9. Measurements are presented of the
per-event charged particle density distribution, dN_ch/deta, and the
average charged particle multiplicity in the pseudorapidity interval
|eta|<0.5 in several intervals of collision centrality. The results
are compared to previous mid-rapidity measurements at the LHC and RHIC.
The variation of the mid-rapidity charged particle yield per colliding
nucleon pair with the number of participants is consistent with the
lower sqrt(s_NN) results. The shape of the dN_ch/deta distribution is
found to be independent of centrality within the systematic
uncertainties of the measurement.