2,646,401 research outputs found
Possible glueball production in relativistic heavy-ion collisions
Within a thermal model we estimate possible multiplicities of scalar
glueballs in central Au+Au collisions at AGS, SPS, RHIC and LHC energies. For
the glueball mass in the region 1.5-1.7 GeV, the model predicts on average (per
event) 0.5-1.5 glueballs at RHIC and 1.5-4 glueballs at LHC energies. Possible
enhancement mechanisms are discussed.Comment: 8 pages, 2 figure
On the possibility of q-scaling in high energy production processes
It has been noticed recently that transverse momenta (p_T) distributions
observed in high energy production processes exhibit remarkably universal
scaling behaviour. This is the case when a suitable variable replaces the usual
p_T. On the other hand, it is also widely known that transverse momentum
distributions in general follow a power-like Tsallis distribution, rather than
an exponential Boltzmann-Gibbs, with a (generally energy dependent)
nonextensivity parameter q. Here we show that it is possible to choose a
suitable variable such that all the data can be fitted by the same Tsallis
distribution (with the same, energy independent value of the q-parameter). Thus
they exhibit q-scaling.Comment: Final version, accepted by J.Phys.
To what distances do we know the confining potential?
We argue that asymptotically linear static potential is built in into the
common procedure of extracting it from lattice Wilson loop measurements. To
illustrate the point, we extract the potential by the standard lattice method
in a model vacuum made of instantons. A beautiful infinitely rising linear
potential is obtained in the case where the true potential is actually
flattening. We argue that the flux tube formation might be also an artifact of
the lattice procedure and not necessarily a measured physical effect.
We conclude that at present the rising potential is known for sure up to no
more than about 0.7 fm. It may explain why no screening has been clearly
observed so far for adjoint sources and for fundamental sources but with
dynamical fermions.
Finally, we speculate on how confinement could be achieved even if the static
potential in the pure glue theory is not infinitely rising.Comment: 16 pages, 5 figures. Additional arguments presented, a new figure and
references adde
Experimental Status of Exotic Mesons and the GlueX Experiment
One of the unanswered and most fundamental questions in physics regards the
nature of the confinement mechanism of quarks and gluons in QCD. Exotic hybrid
mesons manifest gluonic degrees of freedom and their spectroscopy will provide
the data necessary to test assumptions in lattice QCD and the specific
phenomenology leading to confinement. Within the past two decades a number of
experiments have put forth tantalizing evidence for the existence of exotic
hybrid mesons in the mass range below 2 GeV. This talk represents an overview
of the available data and what has been learned. In looking toward the future,
the GlueX experiment at Jefferson Laboratory represents a new initiative that
will perform detailed spectroscopy of the light-quark meson spectrum. This
experiment and its capabilities will be reviewed.Comment: 10 pages, 8 figures, 2nd Meeting of the APS Topical Group on Hadron
Physics GHP06, Nashville, TN (10/22-10/24/06
Cube or hypercube of natural units
Max Planck introduced four natural units: h, c, G, k. Only the first three of
them retained their status, representing the so called cube of theories, after
the theory of relativity and quantum mechanics were created and became the
pillars of physics. This short note is a little pebble on the tombstone of
Michael Samuilovich Marinov.Comment: 7 pages, to be published in ``Multiple facets of quantization and
supersymmetry'', Michael Marinov Memorial Volume, Eds. M. Olshanetsky and A.
Vainshtein, World Scientific, 200
Michael Webster, clarinet and Beveridge Webster, piano, February 17, 1985
This is the concert program of the Michael Webster, clarinet and Beveridge Webster, piano performance on Sunday, February 17, 1985 at 8:00 p.m., at the Concert Hall, 855 Commonwealth Avenue. Works performed were Sonata by Francis Poulenc, Sonata in F minor, Op. 120 No. 1 by Johannes Brahms, Sonata by Michael Webster, Soliloquies for Solo Clarinet by Leslie Bassett, Petite Pièce by Claude Debussy, and Première Rhapsody by C. Debussy. Digitization for Boston University Concert Programs was supported by the Boston University Humanities Library Endowed Fund
Short-range potentials from QCD at order
We systematically compute the effective short-range potentials arising from
second order QCD-diagrams related to bound states of quarks, antiquarks, and
gluons. Our formalism relies on the assumption that the exchanged gluons are
massless, while the constituent gluons as well as the lightest quarks acquire a
nonvanishing constituent mass because of confinement. The potentials we obtain
include the first relativistic corrections, thus spin-spin terms, spin-orbit
terms, etc. Such effective potentials are expected to be relevant for the
building of accurate potential models describing usual hadrons as well as
exotic ones like glueballs and hybrids. In particular, we compute
for the first time an effective quark-gluon potential, and show the existence
of a quadrupolar interaction term in this case. We also discuss the influence
of a possible nonzero mass for the exchanged gluons.Comment: 33 pages, 4 tables and 12 figures ; typos correcte
Hadron Spectroscopy: Theory and Experiment
Many new results on hadron spectra have been appearing in the past few years
thanks to improved experimental techniques and searches in new channels. New
theoretical techniques including refined methods of lattice QCD have kept pace
with these developments. Much has been learned about states made of both light
(u, d, and s) and heavy (c, b) quarks. The present review treats light-quark
mesons, glueballs, hybrids, particles with a single c or b quark, charmonium,
and bottomonium states. Some prospects for further study are noted.Comment: 29 pages, 9 figures, to be published in Journal of Physics G. Further
updating of reference
Ariel - Volume 3 Number 8
Editors
Richard J. Bonanno
Robin A. Edwards
Associate Editors
Steven Ager
Tom Williams
Lay-out Editor
Eugenia Miller
Contributing Editors
Paul Bialas
Robert Breckenridge
David Jacoby
Mike LeWitt
Terry Burt
Michael Leo
Editors Emeritus
Delvyn C. Case, Jr.
Paul M. Fernhof
Ariel - Volume 3 Number 7
Editors
Richard J. Bonanno
Robin A. Edwards
Associate Editors
Steven Ager
Tom Williams
Lay-out Editor
Eugenia Miller
Contributing Editors
Paul Bialas
Robert Breckenridge
David Jacoby
Mike LeWitt
Terry Burt
Michael Leo
Editors Emeritus
Delvyn C. Case, Jr.
Paul M. Fernhof
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