2,229 research outputs found
Quarkonium production in A-A and p-A collisions
Thirty years ago, the suppression of quarkonium production in heavy-ion
collisions was first proposed as an unambiguous signature for the formation of
a Quark-Gluon Plasma. Recent results from the LHC run 2 have led to an
unprecedented level of precision on this observable and, together with new data
from RHIC, are providing an accurate picture of the influence of the medium
created in nuclear collisions on the various charmonium (J/, (2S))
and bottomonium (, , ) states,
studied via their decay into lepton pairs. In this contribution, I will review
the new results presented at Quark Matter 2017, emphasizing their relation with
previous experimental observations and comparing them, where possible, with
theoretical calculations.Comment: 8 pages, 8 figures, to be published in Nuclear Physics A, proceedings
of the XXVI international conference on ultrarelativistic heavy-ion
collisions, Quark Matter 2017, February 5-11, 201
Heavy-ion collisions at the Large Hadron Collider: a review of the results from Run 1
We present an overview of the results obtained in pPb and PbPb collisions at
the Large Hadron Collider during Run 1. We first discuss the results for global
characteristics: cross sections, hadron multiplicities, azimuthal asymmetries,
correlations at low transverse momentum, hadrochemistry, and femtoscopy. We
then review hard and electromagnetic probes: particles with high transverse
momentum, jets, heavy quarks, quarkonium, electroweak bosons and high
transverse momentum photons, low transverse momentum photons and dileptons, and
ultraperipheral collisions. We mainly focus on the experimental results, and
present very briefly the main current theoretical explanations.Comment: 33 pages, 29 figure
Latest results on charmonium and open charm at the CERN SPS
Abstract The NA60 Collaboration has studied muon pair production in p-A and In-In collisions at SPS energy. In the charm sector, the main focus is on the measurement of the J/ψ, but also open charm production can be addressed through the measurement of continuum muon pairs from semi-leptonic decays of charmed hadrons. In this contribution the latest results obtained on J/ψ suppression in cold and hot nuclear matter will be presented. In addition, first preliminary results on the A-dependence of open charm production in p-A collisions at 400 GeV will be discussed
Early pp physics at ALICE
The ALICE experiment, dedicated for heavy-ion collisions at the LHC, is taking data with proton-proton collisions since November 2009. This contribution summarizes the first year of operation and performance of the ALICE detector at the LHC as well as the first results from pp collisions at 0.9TeV and 7TeV. In particular, results on global event properties and identified particle spectra, including
strangeness, open charm and charmonium production, will be discussed
Hard and electromagnetic probes: plans for future measurements at the CERN SPS
The CERN SuperProtoSynchrotron (SPS) represents an ideal facility for
fixed-target heavy-ion experiments exploring the phase diagram of strongly
interacting matter in the region MeV. It can deliver
high-intensity beams ( Pb/s), allowing a study of rare probes of the
Quark-Gluon Plasma, including electromagnetic and hard processes. The
NA61/SHINE experiment is currently active and plans to perform a first direct
measurement of open charm production in Pb--Pb collisions at top SPS energy and
possibly at lower energies. The project of a new experiment, NA60+, based on a
muon spectrometer coupled to a vertex spectrometer is currently being
developed, for the study of dimuon and heavy quark production, and a Letter of
Intent was recently submitted. In this contribution the physics motivation for
the studies of rare probes, the existing and planned experimental set-ups and
their expected physics performance will be discussed.Comment: 10 pages, 9 figures, contribution to the proceedings of the 11th
International Conference on Hard and Electromagnetic Probes of High-Energy
Nuclear Collisions (Hard Probes 2023), Aschaffenburg (Germany), March 26-31,
2023. Submitted to PoS. arXiv admin note: substantial text overlap with
arXiv:2209.0677
J/ production in In-In and p-A collisions
The NA60 experiment studies dimuon production in In-In and p-A collisions at
the CERN SPS. We report recent results on \jpsi production, measured through
its muon pair decay. As a function of centrality, we show that in In-In the
\jpsi yield is suppressed beyond expectations from nuclear absorption. We
present also for the first time results on \jpsi production in p-A collisions
at 158 GeV, the same energy of the nucleus-nucleus data. For both p-A and In-In
we show preliminary results on \psip suppression. Finally, we have studied the
kinematical distributions of the \jpsi produced in In-In collisions. We present
results on transverse momentum and rapidity, as well as on the angular
distribution of the \jpsi decay products.Comment: 8 pages, Quark Matter 2006 conference proceeding
Open-charm enhancement at FAIR?
We have calculated the D-meson spectral density at finite temperature within
a self-consistent coupled-channel approach that generates dynamically the
(2593) resonance. We find a small mass shift for the D-meson in
this hot and dense medium while the spectral density develops a sizeable width.
The reduced attraction felt by the D-meson in hot and dense matter together
with the large width observed have important consequences for the D-meson
production in the future CBM experiment at FAIR.Comment: 4 pages, 2 figures, to appear in the proceedings of 9th International
Conference on Strangeness in Quark Matter (SQM2006), Los Angeles, USA, March
26-31, 200
A Fixed-Target ExpeRiment at the LHC (AFTER@LHC) : luminosities, target polarisation and a selection of physics studies
We report on a future multi-purpose fixed-target experiment with the proton
or lead ion LHC beams extracted by a bent crystal. The multi-TeV LHC beams
allow for the most energetic fixed-target experiments ever performed. Such an
experiment, tentatively named AFTER for "A Fixed-Target ExperRiment", gives
access to new domains of particle and nuclear physics complementing that of
collider experiments, in particular at RHIC and at the EIC projects. The
instantaneous luminosity at AFTER using typical targets surpasses that of RHIC
by more than 3 orders of magnitude. Beam extraction by a bent crystal offers an
ideal way to obtain a clean and very collimated high-energy beam, without
decreasing the performance of the LHC. The fixed-target mode also has the
advantage of allowing for spin measurements with a polarised target and for an
access over the full backward rapidity domain up to xF ~ - 1. Here, we
elaborate on the reachable luminosities, the target polarisation and a
selection of measurements with hydrogen and deuterium targets.Comment: 6 pages. Proceedings of the Sixth International Conference on Quarks
and Nuclear Physics QNP2012 (16-20 April 2012, Ecole Polytechnique,
Palaiseau,France
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