250 research outputs found
Heavy Flavor Probes of Quark Matter
A brief survey of the role of heavy flavors as a probe of the state of matter
produced by high energy heavy ion collisions is presented. Specific examples
include energy loss, initial state gluon saturation, thermalization and flow.
The formation of quarkonium bound states from interactions in which multiple
heavy quark-antiquark pairs are initially produced is examined in general.
Results from statistical hadronization and kinetic models are summarized. New
predictions from the kinetic model for J/Psi at RHIC are presented.Comment: Based on invited plenary talk at Strange Quark Matter 2004, Cape
Town, South Africa, September 15-20, 2004, references completed, published in
J. Phys. G: Nucl. Part. Phys. 31 (2005) S641-S64
Quarkonium Formation Time in a Model-Independent Approach
We use dispersion relations to reconstruct, in a model-independent way, the
formation dynamics of heavy quarkonium from the experimental data on e+ e-
annihilation to Q-bar Q. We extract a distribution of formation times with a
mean value for the J/psi, tau{J/psi} = 0.44 fm; and for the Upsilon,
tau{Upsilon} = 0.32 fm. The corresponding widths of these distributions are
given by Delta-tau{J/psi} = 0.31 fm and Delta-tau{Upsilon} = 0.28 fm. This
information can be used as an input in modeling of heavy quarkonium production
on nuclear targets.Comment: 10 pages with 3 figure
Meson PVV Interactions are determined by Quark Loops
We show that all abnormal parity three-body meson interactions can be
adequately described by quark loops, evaluated at zero external momentum, with
couplings determined by symmetry. We focus primarily on radiative
meson decays which involve one pseudoscalar. The agreement with experiment for
non-rare decays is surprisingly good and requires very few parameters, namely
the coupling constants and and some mixing angles.
This agreement extends to some three-body decays that are dominated by pion
pairs in a P-wave state.Comment: 21 pages, Revtex, one figur
An Experimental Overview of Results Presented at SQM 2006
I have been asked to give an critical overview on the experimental results
shown in the conference with a emphasis of what has been learned and the
challenges that are ahead in trying to understand the physics of the strongly
interacting quark-gluon plasma. I will not try to summarize all of the results
presented, rather I will concentrate primarily on RHIC data from this
conference. Throughout this summary, I will periodically review some of the
previous results for those not familiar with the present state of the field.Comment: 15 pages, 12 Figure
Kaon Weak Decays in Chiral Theories
The ten nonleptonic weak decays , , , , , are predicted for a
chiral pole model based on the linear sigma model theory which automatically
satisfies the partial conservation of axial current (PCAC) hypothesis. These
predictions, agreeing with data to the 5% level and containing no or at most
one free parameter, are compared with the results of chiral perturbation theory
(ChPT). The latter ChPT approach to one-loop level is known to contain at least
four free parameters and then predicts a rate
which is 60% shy of the experimental value. This suggests that ChPT is an
unsatisfactory approach towards predicting kaon weak decays.Comment: 12 pages, 8 eps figure
Quark Matter and Nuclear Collisions: A Brief History of Strong Interaction Thermodynamics
The past fifty years have seen the emergence of a new field of research in
physics, the study of matter at extreme temperatures and densities. The theory
of strong interactions, quantum chromodynamics (QCD), predicts that in this
limit, matter will become a plasma of deconfined quarks and gluons -- the
medium which made up the early universe in the first 10 microseconds after the
big bang. High energy nuclear collisions are expected to produce short-lived
bubbles of such a medium in the laboratory. I survey the merger of statistical
QCD and nuclear collision studies for the analysis of strongly interacting
matter in theory and experiment.Comment: 24 pages, 14 figures Opening Talk at the 5th Berkeley School on
Collective Dynamics in High Energy Collisions, LBNL Berkeley/California, May
14 - 18, 201
Radiative decays of heavy and light mesons in a quark triangle approach
The radiative meson decays and are
analyzed using the quark triangle diagram. Experimental data yield well
determined estimates of the universal quark-antiquark-meson couplings
and for the light meson sector. Also
predictions for the ratios of neutral to charged heavy meson decay coupling
constants are given and await experimental confirmation.Comment: 31 pages of RevTex, 5 figures, Postscript version available at
http://info.utas.edu.au/docs/physics/theory/Publications/9548.html, scheduled
to appear in Phys. Rev. D, vol 53, issue 11, 199
Heavy Flavor Hadrons in Statistical Hadronization of Strangeness-rich QGP
We study b, c quark hadronization from QGP. We obtain the yields of charm and
bottom flavored hadrons within the statistical hadronization model. The
important novel feature of this study is that we take into account the high
strangeness and entropy content of QGP, conserving strangeness and entropy
yields at hadronization.Comment: v2 expended: 20 pages, 23 figures, 5 tables, in press EPJ-
Hard probes in heavy ion collisions at the LHC: heavy flavour physics
We present the results from the heavy quarks and quarkonia working group.
This report gives benchmark heavy quark and quarkonium cross sections for
and collisions at the LHC against which the rates can be compared in
the study of the quark-gluon plasma. We also provide an assessment of the
theoretical uncertainties in these benchmarks. We then discuss some of the cold
matter effects on quarkonia production, including nuclear absorption,
scattering by produced hadrons, and energy loss in the medium. Hot matter
effects that could reduce the observed quarkonium rates such as color screening
and thermal activation are then discussed. Possible quarkonium enhancement
through coalescence of uncorrelated heavy quarks and antiquarks is also
described. Finally, we discuss the capabilities of the LHC detectors to measure
heavy quarks and quarkonia as well as the Monte Carlo generators used in the
data analysis.Comment: 126 pages Latex; 96 figures included. Subgroup report, to appear in
the CERN Yellow Book of the workshop: Hard Probes in Heavy Ion Collisions at
the LHC. See also http://a.home.cern.ch/f/frixione/www/hvq.html for a version
with better quality for a few plot
Inelastic Final-State Interactions and Two-body Hadronic B decays into Single-Isospin channels
The role of inelastic final-state interactions in CP asymmetries and
branching ratios is investigated in certain chosen single isospin two-body
hadronic B decays. Treating final-state interactions through Pomeron and Regge
exchanges, we demonstrate that inelastic final state interactions could lead to
sizeable effects on the CP asymmetry.Comment: 23 pages, Latex, 1 eps-figur
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