3,478 research outputs found
Detection of D^0 mesons via hadronic decays in Pb-Pb collisions at LHC with ALICE
The ALICE experiment is devoted to the study of heavy-ion collisions at the
CERN LHC collider. We present the results of a feasibility study for the
detection of D^0 \to K^-\pi^+ decays in Pb-Pb collisions with ALICE.Comment: 4 pages, 2 figures. Prepared for 5th International Conference on
Quark Confinement and the Hadron Spectrum, Gargnano, Brescia, Italy, 10-14
Sep 2002. Published in *Gargnano 2002, Quark confinement and the hadron
spectrum* 464-46
Charm and beauty of the Large Hadron Collider
With the acceleration of lead nuclei in the LHC, heavy-ion physics will enter
a new energy domain. One of the main novelties introduced by the 30-fold
energy-jump from RHIC to the LHC is the abundant heavy-quark production. After
discussing a few examples of physics issues that can be addressed using heavy
quarks, we present a selection of results on the expected experimental
capability of ALICE, the dedicated heavy-ion experiment at the LHC, in the
open-heavy-flavour sector.Comment: 10 pages, 5 figures. Invited talk at Strangeness in Quark Matter
(SQM) 2004, Cape Town, South Africa, 15-20 September 2004. Submitted to J.
Phys.
ALICE potential for heavy-flavour physics
The Large Hadron Collider (LHC), where lead nuclei will collide at the
unprecedented c.m.s. energy of 5.5 TeV per nucleon-nucleon pair, will offer new
and unique opportunities for the study of the properties of strongly
interacting matter at high energy density over extended volumes. We will
briefly explain why heavy-flavour particles are well-suited tools for such a
study and we will describe how the ALICE experiment is preparing to make use of
these tools.Comment: 6 pages, 3 figures, prepared for the Proceedings of "Strange Quark
Matter 2007", Levoca, Slovaki
Charm quenching in heavy-ion collisions at the LHC
D-meson suppression in Pb-Pb collisions at the LHC due to charm quark
in-medium energy loss is estimated within a model that describes the available
quenching measurements at RHIC. The result is compared to that previously
published by the author. The expected sensitivity of the ALICE experiment for
studying charm energy loss via fully-reconstructed D^0-meson decays is also
presented.Comment: 8 pages, 3 figures. To appear in the proceedings of Hot Quarks 2004:
Workshop for Young Scientists on the Physics of Ultrarelativistic
Nucleus-Nucleus Collisions, Taos Valley, New Mexico, 18-24 July 2004.
Submitted to J. Phys.
First measurement of the strange particles Rcp nuclear modification factors in heavy-ion collisions at the SPS
The NA57 experiment has measured the pt distributions of K0s, Lambda, and
antiLambda particles in fixed-target Pb-Pb interactions at sqrt(s_{NN})=17.3
GeV as a function of the collision centrality. In this paper we study the
central-to-peripheral nuclear modification factors and compare them to other
measurements and to theoretical predictions.Comment: Contribution to the poster session of the Quark Matter 2005
Conference. To be published in Acta Physica Hungarica A, Heavy Ion Physic
Review on Heavy-Ion Physics
Collisions of heavy ions (nuclei) at ultra-relativistic energies (sqrt(s_NN)
>> 10 GeV per nucleon-nucleon collision in the centre of mass system) are
regarded as a unique tool to produce in the laboratory a high energy density
and high temperature state of strongly-interacting matter. In this short
review, we will discuss the expected features of this hot and dense state,
describe indications on its properties emerged from the experimental programs
at the CERN-SPS and BNL-RHIC accelerators, and finally outlook the perspectives
for the forthcoming heavy-ion runs at the CERN-LHC.Comment: 8 pages, 4 figures, proceedings of the conference IFAE 2010 (Incontri
di Fisica delle Alte Energie), Roma, April 201
How sensitive are high-pt electron spectra at RHIC to heavy quark energy loss?
In nucleus-nucleus collisions, high-pt electron spectra depend on the medium
modified fragmentation of their massive quark parents, thus giving novel access
to the predicted mass hierarchy of parton energy loss. Here we calculate these
spectra in a model, which supplements the perturbative QCD factorization
formalism with parton energy loss. In general, we find - within large errors -
rough agreement between theory and data on the single inclusive electron
spectrum in pp, its nuclear modification factor, and its azimuthal anisotropy.
However, the nuclear modification factor depends on the relative contribution
of charm and bottom production, which we find to be affected by large
perturbative uncertainties. In order for electron measurements to provide a
significantly more stringent test of the expected mass hierarchy, one must then
disentangle the b- and c-decay contributions, for instance by reconstructing
the displaced decay vertices.Comment: 9 pages RevTex, 4 eps-figures, asci-file containing numerical tables
of results include
Heavy-to-light ratios as a test of medium-induced energy loss at RHIC and the LHC
The ratio of nuclear modification factors of high- heavy-flavored mesons
tolight-flavored hadrons (heavy-to-light ratio) is shown to be a sensitive tool
to test medium-induced energy loss at RHIC and LHC energies. Heavy-to-light
ratios of mesons at RHIC in the region GeV, and of and
mesons at the LHC in the region GeV, are proposed for such a test.
Finally, the different contributions to the nuclear modification factor for
electrons at RHIC are analyzed. Preliminary PHENIX and STAR data are compatible
with radiative energy loss provided the contribution of electrons from beauty
decays is small compared to that from charm.Comment: 5 pages, latex, 4 eps figs included using graphicx; to appear in the
proceedings of 18th International Conference on Ultrarelativistic
Nucleus-Nucleus Collisions: Quark Matter 2005 (QM 2005), Budapest, Hungary,
4-9 Aug 200
Correlations of Heavy Quarks Produced at Large Hadron Collider
We study the correlations of heavy quarks produced in relativistic heavy ion
collisions and find them to be quite sensitive to the effects of the medium and
the production mechanisms. In order to put this on a quantitative footing, as a
first step, we analyze the azimuthal, transverse momentum, and rapidity
correlations of heavy quark-anti quark () pairs in
collisions at (). This sets the stage for the
identification and study of medium modification of similar correlations in
relativistic collision of heavy nuclei at the Large Hadron Collider. Next we
study the additional production of charm quarks in heavy ion collisions due to
multiple scatterings, {\it viz.}, jet-jet collisions, jet-thermal collisions,
and thermal interactions. We find that these give rise to azimuthal
correlations which are quite different from those arising from prompt initial
production at leading order and at next to leading order.Comment: 26 pages, 15 figures. Three new figures added, comparison to
experimental data included, abstract and discussion expande
D meson nuclear modification factors in Pb-Pb collisions at {\surd}sNN = 2.76 TeV, measured with the ALICE detector
The ALICE experiment has measured the D meson production in pp and Pb-Pb
collisions at the LHC at {\surd}s = 7 and 2.76 TeV and {\surd}sNN = 2.76 TeV
respectively, via the exclusive reconstruction of hadronic decay channels. The
analyses of the D0{\to}K-pi+ and D+{\to}K-pi+pi+ channels will be described and
the preliminary results for the D0 and D+ nuclear modification factor will be
presented.Comment: Proceedings of Quark Matter 2011 conference. 4 pages, 4 figures. The
slides of the talk can be found at the link:
http://indico.cern.ch/materialDisplay.py?contribId=591&sessionId=53&materialId=slides&confId=3024
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