3,557 research outputs found
ALICE Measurements in p-Pb Collisions: Charged Particle Multiplicity, Centrality Determination and implications for Binary Scaling
Measurements of particle production in proton-nucleus collisions provide a
reference to disentangle final state effects, i.e. signatures of the formation
of a deconfined hot medium, from initial state effects, already present in cold
nuclear matter. Since many initial state effects are expected to vary as a
function of the number of collisions suffered by the incoming proton, it is
crucial to estimate the centrality of the collision. In p-Pb collisions
categorization of events into different centrality classes using a particle
multiplicity distribution is complicated by the low particle multiplicities and
the large multiplicity fluctuations. We present ALICE measurements of particle
production in p-Pb collisions at sqrt(sNN) = 5.02$ TeV, including the
pseudo-rapidity and transverse momentum dependence, we discuss the event
classification in centrality classes and its implications for the measurements
of nuclear modification factors.Comment: 8 pages, 4 figures, to be published in NPA. Proceedings of IS201
Particle production in p-Pb collisions with ALICE at the LHC
Measurements of the transverse momentum spectra of light flavor particles at
intermediate and high pT are an important tool for QCD studies. In pp
collisions they provide a baseline for perturbative QCD, while in Pb-Pb they
are used to investigate the suppression caused by the surrounding medium. In
p-Pb collisions, such measurements provide a reference to disentangle final
from initial state effects and thus play an important role in the search for
signatures of the formation of a deconfined hot medium. While the comparison of
the p-Pb and Pb-Pb data indicates that initial state effects do not play a role
in the suppression of hadron production observed at high pT in heavy ion
collisions, several measurements of particle production in the low and
intermediate pT region indicate the presence of collective effects.Comment: Proceedings of Nucleus-Nucleus 2015, 8 pages, 6 (multiple) figure
How aligned are we? Assessment procedures and practices between early childhood and early intervention
Early intervention and early childhood share a unique space in our early years education in Aotearoa/New Zealand. The assessment practices of the two are distinctively different and specific to each discipline. As assessment is a powerful agent for change and responsiveness to learners this article will unpack the reasoning behind these differences and consider the possibility of addressing a possible alignment through the early childhood curriculum Te Whariki (Ministry of Education, 1996)
Measurement of low mass dielectron continuum in sqrt(s_NN)=200GeV Au+Au collisions with the PHENIX experiment at RHIC
Electromagnetic probes are ideally suited to investigate hot and dense matter
produced in high energy heavy ion collisions. They do not undergo strong
interactions and thus probe the time evolution of the collision. The dielectron
continuum is rich in physics. Dalitz decays of light hadrons and direct decays
of vector mesons, which might be modified in the medium, and correlated charm
decays contribute to the spectrum. Furthermore, exotic states, e.g
quasi-particles predicted to exist in the medium only beyond the phase
transition, might leave their footprint in the continuum. Although correlated
e+e- pairs are rare, the 0.24 nb^-1 collected by PHENIX for Au+Au collisions at
sqrt(s_NN)= 200 GeV in 2004 provides a significant sample to investigate the
dilepton continuum. The continuum and its resonances are separated from the
combinatorial background via an event mixing technique. Mass spectra are
presented and compared with the expectations from decays of hadronic sources.Comment: 4 pages, 5 figures, conference proceedin
Centrality Dependence of Particle Production in p--A collisions measured by ALICE
We present the centrality dependence of particle production in p-A collisions
at sqrt(s_NN) = 5.02 TeV measured by the ALICE experiment, including the
pseudo-rapidity and transverse momentum spectra, with a special emphasis on the
event classification in centrality classes and its implications for the
interpretation of the nuclear effects.Comment: Proceedings of Quark Matter 2014 4 pages, 3 figure
Dileptons from the nonequilibrium Quark-Gluon Plasma
According to the dynamical quasiparticle model (DQPM) -- matched to reproduce
lattice QCD results in thermodynamic limit, -- the constituents of the strongly
interacting quark-gluon plasma (sQGP) are massive and off-shell quasi-particles
(quarks and gluons) with broad spectral functions. In order to address the
electromagnetic radiation of the sQGP, we derive off-shell cross sections of
, and () reactions taking into account the effective propagators
for quarks and gluons from the DQPM. Dilepton production in In+In collisions at
158 AGeV is studied by implementing these processes into the
parton-hadron-string dynamics (PHSD) transport approach. The microscopic PHSD
transport approach describes the full evolution of the heavy-ion collision:
from the dynamics of quasi-particles in the sQGP phase (when the local energy
density is above GeV/fm) through hadronization and to the
following hadron interactions and off-shell propagation after the
hadronization. A comparison to the data of the NA60 Collaboration shows that
the low mass dilepton spectra are well described by including a collisional
broadening of vector mesons, while the spectra in the intermediate mass range
are dominated by off-shell quark-antiquark annihilation, quark Bremsstrahlung
and gluon-Compton scattering in the nonperturbative QGP. In particular, the
observed softening of the spectra at intermediate masses (1 GeV 3 GeV) is approximately reproduced.Comment: 8 pages, 8 figures, to be published in the Proceedings of the 26th
Winter Workshop on `Nuclear Dynamics', Ochto Rios, Jamaica, 2-9 January, 201
Functional outcomes of peripheral nerve repair and regeneration: clinical and experimental study
This study investigated pre- and post-operative evaluation of peripheral nerve injuries and functional outcomes of peripheral nerve regeneration after different type of injuries and different type of treatments. Neuromas/scar neuritis and brachial plexus injuries are specifically addressed; literature and experimental evidence on the outcomes of vascularized nerve grafts are presented
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