2,300 research outputs found
Heavy-Flavor Collectivity - Light-Flavor Thermalization at RHIC
Flow measurements of multi-strange baryons from Au + Au collisions at RHIC
energies demonstrate that collectivity develops before hadronization, among
partons. To pin down the partonic EOS of matter produced at RHIC, the status of
thermalization in such collisions has to be addressed. We propose to measure
collective flow of heavy-flavor quarks, e.g. charm quarks, as an indicator of
thermalization of light flavors (). The completion of the time of flight
barrel and the proposed upgrade with a Vertex detector for heavy-flavor
identification in STAR are well suited for achieving these goals.Comment: proceedings of the ISMD 2005 conference, Kromeriz, Czech Republic; 6
pages, 4 figure
momentum correlations versus relative azimuth as a sensitive probe for thermalization
In high-energy nuclear collisions at LHC, where a QGP might be created, the
degree of thermalization at the partonic level is a key issue. Due to their
large mass, heavy quarks are a powerful tool to probe thermalization. We
propose to measure azimuthal correlations of heavy-quark hadrons and their
decay products. Changes or even the complete absence of these initially
existing azimuthal correlations in collisions might indicate
thermalization at the partonic level. We present studies with PYTHIA for
collisions at 14 TeV using the two-particle transverse momentum correlator
as a sensitive measure
of potential changes in these azimuthal correlations. Contributions from
transverse radial flow are estimated.Comment: proceedings of the ISMD08 conference, DESY, Hamburg, Germany; to
appear in DESY-PROC, 5 pages, 4 fig
Prompt production of D mesons with ALICE at the LHC
This is a brief summary of prompt production of D mesons in pp and Pb-Pb
collisions with the ALICE apparatus at the LHC.Comment: 42 pages, 11 figs, 1 table, 141 references, cumulative Habilitation
thesis, University of Heidelberg, scientific summary only, cover page in
German, unpublishe
The three-dimensional BF Model with Cosmological Term in the Axial Gauge
We quantize the three-dimensional -model using axial gauge conditions.
Exploiting the rich symmetry-structure of the model we show that the
Green-functions correspond to tree graphs and can be obtained as the unique
solution of the Ward-Identities. Furthermore, we will show that the theory can
be uniquely determined by symmetry considerations without the need of an action
principle.Comment: one reference added, transmission errors correcte
Remarks on Topological SUSY in sixdimensional TQFTs
We establish the existence of the topological vector supersymmetry in the six
dimensional topological field theory for two-form fields introduced by Baulieu
and West. We investigate the relation of these symmetries to the twist
operation for the (2,0) supersymmetry and comment on their resemblance to the
analogous symmetries in topological Yang-Mills theory.Comment: 12 pages, to be published in JHEP 11(1999)03
Twisted N=4 SUSY Algebra in Topological Models of Schwarz Type
We reinvestigate the twisted N=4 supersymmetry present in Schwarz type
topological field models. We show that Chern-Simons theory in three dimensions
can be untwisted to a kind of sigma-model with reversed statistics only in the
free case. By dimensional reduction we define then the two-dimensional
BF-model. We establish an analog result concerning the untwisting. As a
consequence of the definition through dimensional reduction we find new
fermionic scalar symmetries that have been overlooked so far in the literature.Comment: 12 pages, no figure, Late
Study of Cronin effect and nuclear modification of strange particles in d-Au and Au-Au collisions at 200 GeV in PHENIX
Effects of strangeness on nuclear modification in d-Au and Au-Au collisions
at 200 GeV are studied, in order to quantify the effects of quark content and
mass. Measurements of ratios of the yields in central collisions to the yields
in peripheral collisions are performed for lambda baryon and phi meson. Found
results show little dependence of particle suppression or enhancement on mass
and strange content, but rather prominent difference in nuclear modification
between mesons and baryons.Comment: 4 pages, 4 figures, proceedings of the Seventeenth International
Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter
2004
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