INVESTIGADORES
OTERO Y GARZON Gustavo Javier
artículos
Título:
Measurement of the centrality dependence of J/{\psi} yields and observation of Z production in lead-lead collisions with the ATLAS detector at the LHC.
Autor/es:
G. OTERO Y GARZON, R. PIEGAIA, ET. AL., THE ATLAS COLLABORATION
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
APS
Referencias:
Año: 2010 p. 294 - 312
ISSN:
0556-2821
Resumen:
Using the ATLAS detector, a centrality-dependent suppression has
been observed in the yield of J/{\psi} mesons produced in the
collisions of lead ions at the Large Hadron Collider. In a sample of
minimum-bias lead-lead collisions at a nucleon-nucleon centre of mass
energy \surd sNN = 2.76 TeV, corresponding to an integrated luminosity
of about 6.7 {\mu}b^{-1}, J/{\psi} mesons are reconstructed via their
decays to {\mu}+{\mu}- pairs. The measured J/{\psi} yield, normalized
to the number of binary nucleon-nucleon collisions, is found to
significantly decrease from peripheral to central collisions. The
centrality dependence is found to be qualitatively similar to the
trends observed at previous, lower energy experiments. The same sample
is used to reconstruct Z bosons in the {\mu}+{\mu}- final state, and a
total of 38 candidates are selected in the mass window of 66 to 116
GeV. The relative Z yields as a function of centrality are also
presented, although no conclusion can be inferred about their scaling
with the number of binary collisions, because of limited statistics.
This analysis provides the first results on J/{\psi} and Z production
in lead-lead collisions at the LHC.