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5
result(s) for
"Karavicheva, T.L."
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A new measurement of$J/\\psi$suppression in Pb-Pb collisions at 158 GeV per nucleon
We present a new measurement of $J/\\psi$ production in Pb-Pb collisions at 158 GeV/nucleon, from the data sample collected in year 2000 by the NA50 Collaboration, under improved experimental conditions with respect to previous years. With the target system placed in vacuum, the setup was better adapted to study, in particular, the most peripheral nuclear collisions with unprecedented accuracy. The analysis of this data sample shows that the ($J/\\psi$)/Drell-Yan cross-sections ratio measured in the most peripheral Pb-Pb interactions is in good agreement with the nuclear absorption pattern extrapolated from the studies of proton-nucleus collisions. Furthermore, this new measurement confirms our previous observation that the ($J/\\psi$)/Drell-Yan cross-sections ratio departs from the normal nuclear absorption pattern for semi-central Pb-Pb collisions and that this ratio persistently decreases up to the most central collisions.
Journal Article
J/ψ and ψ′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV
We report a new measurement of J/ψ, ψ′ and Drell–Yan cross-sections, in the kinematical domain -0.425
Journal Article
ψ′ production in Pb–Pb collisions at 158 GeV/nucleon
ψ′ production is studied in Pb–Pb collisions at 158 GeV/c per nucleon incident momentum. Absolute cross-sections are measured and production rates are investigated as a function of the centrality of the collision. The results are compared with those obtained for lighter colliding systems and also for the J/ψ meson produced under identical conditions.
Journal Article
J/ψ azimuthal anisotropy relative to the reaction plane in Pb-Pb collisions at 158 GeV per nucleon
The
J
/
ψ
azimuthal distribution relative to the reaction plane has been measured by the NA50 experiment in Pb-Pb collisions at 158 GeV/nucleon. Various physical mechanisms related to charmonium dissociation in the medium created in the heavy ion collision are expected to introduce an anisotropy in the azimuthal distribution of the observed
J
/
ψ
mesons at SPS energies. Hence, the measurement of
J
/
ψ
elliptic anisotropy, quantified by the Fourier coefficient
v
2
of the
J
/
ψ
azimuthal distribution relative to the reaction plane, is an important tool to constrain theoretical models aimed at explaining the anomalous
J
/
ψ
suppression observed in Pb-Pb collisions. We present the measured
J
/
ψ
yields in different bins of azimuthal angle relative to the reaction plane, as well as the resulting values of the Fourier coefficient
v
2
as a function of the collision centrality and of the
J
/
ψ
transverse momentum. The reaction plane has been estimated from the azimuthal distribution of the neutral transverse energy detected in an electromagnetic calorimeter. The analysis has been performed on a data sample of about 100 000 events, distributed in five centrality or
p
T
sub-samples. The extracted
v
2
values are significantly larger than zero for non-central collisions and are seen to increase with
p
T
.
Journal Article
The J/$\\psi$normal nuclear absorption
We present a new determination of the ratio of cross-sections (J/$\\psi$)/DY as expected for nucleus-nucleus reactions if J/$\\psi$ would only be normally absorbed by nuclear matter. This anticipated behaviour is based on proton-nucleus data exclusively, and compared, as a function of centrality, with updated S-U results from experiment NA38 and with the most Pb-Pb results from experiment NA50.
Journal Article