3,301 research outputs found
We must know. We will know
The after-dinner talk has by now become a tradition of this Conference series
on Quark Confinement and the Hadron Spectrum. On this occasion, I have tried to
combine a free-style and (hopefully) amusing presentation with deep questions
of physics especially connected with the dynamics of strong interaction. To
this end some masterpieces of classical music (by Beethoven, Mozart, Dvorak,
Stravinsky ...) and pop music (by Bob Dylan, Eric Clapton) were employed to
illustrate certain aspects of physics. By no means was this presentation (nor
this paper) intended as a comprehensive review of the different topics examined
during the Conference, but rather a call for further thinking on the sinergy of
different branches of physics and the excitement of foreseen discoveries in a
not too distant future.Comment: 6 pages, 8 figures, After-dinner talk given at the IX Conference on
Quark Confinement and the Hadron Structure, Madrid, August 30th to September
3rd 201
Searching for hidden sectors in multiparticle production at the LHC
Most signatures of new physics in colliders have been studied so far on the
transverse plane with respect to the beam direction. In this work however we
study the impact of a hidden sector beyond the Standard Model (SM) on inclusive
(pseudo)rapidity correlations and moments of the multiplicity distributions,
with special emphasis in the LHC results.Comment: Presentation given at ICHEP 2014 Valenci
The ridge effect and three-particle correlations
Pseudorapidity and azimuthal three-particle correlations are studied based on
a correlated-cluster model of multiparticle production. The model provides a
common framework for correlations in proton-proton and heavy-ion collisions
allowing easy comparison with the measurements. It is shown that azimuthal
cluster correlations are definitely required in order to understand
three-particle correlations in the near-side ridge effect. This is similar to
the explanation of the ridge phenomenon found in our previous analysis of
two-particle correlations and generalizes the model to higher-order
correlations.Comment: 16 pages, 7 figures. arXiv admin note: text overlap with
arXiv:1610.0640
Three-particle correlations in QCD jets and beyond
In this paper, we present a more detailed version of our previous work for
three-particle correlations in quark and gluon jets [1]. We give theoretical
results for this observable in the double logarithmic approximation and the
modified leading logarithmic approximation. In both resummation schemes, we use
the formalism of the generating functional and solve the evolution equations
analytically from the steepest descent evaluation of the one-particle
distribution. In addition, in this paper we include predictions beyond the
limiting spectrum approximation and study this observable near the hump of the
single inclusive distribution. We thus provide a further test of the local
parton hadron duality (LPHD) and make predictions for the LHC. The computation
of higher rank correlators is presented in the double logarithmic approximation
and shown to be rather cumbersome.Comment: 34 pages and 14 figure
Slow Extraction of Charged Ion Pulses from the REXEBIS
The Isotope mass Separator On-Line DEvice (ISOLDE) facility located at CERN,
produces and transports Radioactive Ion Beams (RIBs) at low or high energy
through the REX/HIE-ISOLDE linear accelerator, for nuclear physics,
astrophysics, solid-state physics and applied-physics purposes. Increasing the
charge state of the ions is a prerequisite for efficient acceleration and is
accomplished by an Electron Beam Ion Source (REXEBIS). For more effective event
discrimination at the experimental detectors, such as the MINIBALL
spectrometer, it is advantageous to increase the pulse width of extracted ions
from this EBIS. A Slow Extraction scheme is presented which uses a function
comprised of discrete voltage steps to apply the extraction potential to the
EBIS trap barrier. This function effectively stretches the pulse length of both
stable and radioactive ion beams, with different mass-to-charge ratios and
provides for extracted pulse widths in the millisecond range. Key operational
parameters of the EBIS impacting the average ionic temperature and its axial
energy spread are discussed, in order to anticipate changes in the resulting
ion pulse time structures during experimental runs.Comment: 17th International Conference on Ion Sources (ICIS17, October 2017,
Geneva
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