This work investigates the applicability of using the Mayer's cluster expansion
method to derive the equation of state (EoS) of the quark-antiquark plasma. Dissociation
of heavier hadrons in QGP is studied. The possibility of the existence of quarkonium
after deconfinement at higher temperature than the critical temperature T > T_{c}
is investigated. The EoS has been studied by calculating second and third cluster
integrals. The results are compared and discussed with available works. (author)$$$$
Comparison of Zgoubi and S-Code regarding the FFAG muon acceleration 10 MB - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/38/105/38105276.pdf - Text Version by Fourrier, J. (Laboratoire de Physique Subatomique et de Cosmologie, Universite Joseph
Fourier / CNRS-IN2P3, 53 Avenue des Martyrs, F-38026 Grenoble (France)); Machida,
S. (Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot
OX11 0QX (United Kingdom)); Laboratoire de Physique Subatomique et de Cosmologie, Universite Joseph Fourier
/ CNRS-IN2P3, 53 Avenue des Martyrs, F-38026 Grenoble (France); Rutherford Appleton
Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX (United Kingdom) Read MoreCollapse
[en]
The high flux accelerator based neutrino source is foreseen as one of the next generation
facilities of particle physics. Called Neutrino Factory (NuFact), it will be based
on a muon storage ring where muons will decay, creating high flux neutrino beams.
Muons are supposed to be accelerated from 5 to 20 GeV before being injected into the
storage ring. In that purpose, Fixed Field Alternating Gradient accelerators (FFAG)
are one of the possibilities. Cell designs have been done and tracking studies are
on their way using codes such as MAD, S-Code or Zgoubi. In order to cross-check results
so obtained, we have performed comparisons between S-Code and Zgoubi at Rutherford
Appleton Laboratory. The present report will explain the different simulations done
and the results. The paper has the following contents: 1. Introduction; 2. Time of
Flight comparisons; 3. Particle acceleration with different emittances; 4. Bunch acceleration.
In conclusion it is shown that the difference of time of flight between the particle
1 and the others is comparable from Zgoubi to S- Code. Nevertheless, further investigation
is necessary to make sure that the same revolution time will be found with the same
initial conditions. Concerning the acceleration it was found that that the larger
the emittance the less efficient appears to be the acceleration. Particles on ellipses
10 to 40 π mm rad are accelerated beyond 9 GeV while particles on ellipse 50 π mm
rad are only accelerated up to 7.5 GeV and those on 60 π mm rad ellipse just reach
6 GeV. Thus, a beam whom emittance would be larger than 30 π mm rad would not be accelerated
enough to reach 10 GeV and to be injected into the second FFAG. In the same way as
for the first FFAG the larger the emittance the less efficient the acceleration. Particles
on ellipses 10 to 40 π mm rad are accelerated beyond 18 GeV while particles on ellipses
50 and 60 π mm rad are only accelerated up to 12 GeV. Thus, beams whom emittance is
lower than 30 π mm rad could be accelerated to an energy close to 20 GeV but not enough
yet. Further simulations should be done to find out if the acceleration to 20 GeV
is possible. As regarding the comparison between the codes it is easy to manage that
both codes give similar results for the longitudinal phase space. They have a good
agreement what makes the results reliable$$$$
Closed tachyon solitons in type II string theory http://dx.doi.org/10.1002/prop.201500029 by Garcia-Etxebarria, Inaki (Max Planck Institute for Physics, Munich (Germany)); Montero,
Miguel (Instituto de Fisica Teorica IFT-UAM/CSIC, C/Nicolas Cabrera 13-15, Universidad
Autonoma de Madrid (Spain); Departamento de Fisica Teorica, Universidad Autonoma de
Madrid (Spain)); Uranga, Angel M. (Instituto de Fisica Teorica IFT-UAM/CSIC, C/Nicolas
Cabrera 13-15, Universidad Autonoma de Madrid (Spain)) Read MoreCollapse
[en]
Type II theories can be described as the endpoint of closed string tachyon condensation
in certain orbifolds of supercritical type 0 theories. In this paper, we study solitons
of this closed string tachyon and analyze the nature of the resulting defects in critical
type II theories. The solitons are classified by the real K-theory groups KO of bundles
associated to pairs of supercritical dimensions. For real codimension 4 and 8, corresponding
to KO(S^{4}) = Z and KO(S^{8}) = Z, the defects correspond to a gravitational
instanton and a fundamental string, respectively. We apply these ideas to reinterpret
the worldsheet GLSM, regarded as a supercritical theory on the ambient toric space
with closed tachyon condensation onto the CY hypersurface, and use it to describe
charged solitons under discrete isometries. We also suggest the possible applications
of supercritical strings to the physical interpretation of the matrix factorization
description of F-theory on singular spaces. (copyright 2015 WILEY-VCH Verlag GmbH
and Co. KGaA, Weinheim)$$$$
Some experimental techniques at storage rings http://dx.doi.org/10.1142/S0218301309012513 by Hartmann, M. (Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany);
Juelich Center for Hadron Physics (JCHP), Institute for Experimental Hadron Dynamics,
Forschungszentrum Juelich, 52425 Juelich (Germany)) Read MoreCollapse
[en]
Two experimental techniques that have been developed at the COoler SYnchrotron COSY-Juelich
are presented: (i) The energy of a stored polarized proton or deuteron beam can be
precisely determined by sweeping an rf magnetic dipole or solenoid field over a spin
resonance. This perturbation induces a beam depolarization, which is maximal at the
spin resonance's frequency. That frequency, together with the beam revolution
frequency, determines the beam's kinematic γ factor, which can thus be measured
with high accuracy. Therefore, the beam energy can be determined about one order of
magnitude more precisely than with conventional methods based on orbit length measurements.
The technique has been used at COSY for an experiment aiming at a high-precision measurement
the mass of the η meson. (ii) The repeated passage of a coasting ion beam through
a thin internal target leads to a beam-energy loss and a shift of its revolution frequency.
This shift is proportional to the beam-target overlap and thus allows one to measure
the target thickness and hence the luminosity during the corresponding experiment.
This effect has been studied quantitatively with a 2.65 GeV proton beam impinging
on a hydrogen cluster-jet target at the ANKE spectrometer. After a careful error evaluation
the luminosity, could be determined with an accuracy of better than 5%. (author)$$$$
We recall the algebraic statement that can be done for Petrov's classification. We
determine Petrov's class in some points of the axial symmetric stationary solution
given in 1953 by Papapetrou. We complete the determination of the Papapetrou non stationary
cylindric solution. (author)$$$$
Decoupled dirac equation in one-boson-Exchange potential model and Hartree-fock calculations 638 KB - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/37/121/37121582.pdf - Text Version by Hanna, K.M.; Swelam, Sh.M. (Mathematics and Theoretical Physics Department, Atomic
Energy Authority, Cairo (Egypt)); Nafea, H.O. (Physics Department, Faculty of Science,
Zagazig University (Banha Branch), Banha (Egypt)) fromProceedings of the Fourth Conference on Nuclear and Particle Physics (NUPPAC-2003) Read MoreCollapse
[en]
On the basis of a semi-relativistic decoupled Dirac equation and self consistent Hartree-Fock
formulation, it is used the One-Boson-Exchange Potential (OBEP) model where each nucleon,
as a Dirac particle, is considered to be a source of a scalar (a) and vector (co)
fields, and is also acted upon by these fields, to get the ground state of some spherical
nuclei. An important mathematical advantage gained by the assumption that each nucleon
in the nucleus is moving under the influence of a common harmonic oscillator is that
(as shown by Talmi) the wave function of the two nucleons is separable in their relative
and center of mass (C.M) coordinates and the known Talmi-Moshinsky brackets. Three
different static nucleon-nucleon interaction forms are used to predict the ground
state energy for^{4}He nucleus$$$$
The CMS Collaboration has recorded 150 μb^{−1} and 35 nb^{−1}
of PbPb and pPb collisions, at 2.76 TeV and 5.02 TeV, respectively. This paper highlights
some of the observations made on these samples. A particular emphasis is given to
the most recent results regarding collectivity, energy loss, nuclear effects and quarkonium
suppression$$$$
Quantum Chromodynamics (QCD) is the theory of the strong interaction, the theory of
the interaction between the constituents of composite elementary particles (hadrons).
In the low energy regime of the theory, standard methods of theoretical physics like
perturbative approaches break down due to a large value of the coupling constant.
However, this is the region of most interest, where the degrees of freedom of QCD,
the color charges, form color-neutral composite elementary particles, like protons
and neutrons. Also the transition to more energetic states of matter like the quark
gluon plasma (QGP), is difficult to investigate with perturbative approaches. A QGP
is a state of strongly interacting matter, which existed shortly after the Big Bang
and can be created with heavy ion collisions for example at the LHC at CERN. In a
QGP the color charges of QCD are deconfined. This thesis explores ways how to use
the non-perturbative approach of lattice QCD to determine properties of the QGP. It
focuses mostly on observables which are derived from the energy momentum tensor, like
two point correlation functions. In principle these contain information on low energy
properties of the QGP like the shear and bulk viscosity and other transport coefficients.
The thesis describes the lattice QCD simulations which are necessary to measure the
correlation functions and proposes new methods to extract these low energy properties.
The thesis also tries to make contact to another non-perturbative approach which is
Improved Holographic QCD. The aim of this approach is to use the Anti-de Sitter/Conformal
Field Theory (AdS/CFT) correspondence to make statements about QCD with calculations
of a five dimensional theory of gravity. This thesis contributes to that work by constraining
the parameters of the model action by comparing the predictions with those of measurements
with lattice QCD.$$$$
The present work deals with the search of third generation squarks in the framework
of the MSSM (minimal supersymmetric standard model) with R-parity conservation, for
small mass differences between these squarks and the lightest supersymmetric particle
(LSP). Data collected at centre-of-mass energies from 189 to 209 GeV by DELPHI detector,
corresponding to an integrated luminosity of 608 pb^{-1}, are analysed in
a search for three topologies. No evidence for deviations from the Standard Model
expectation is found. For a short lifetime stop a lower limit of 71 GeV/c^{2}
is set for the mass, independently of the mixing angle. Long-lived stop and s-bottom
of 97 GeV/c^{2} and 89 GeV/c^{2}, respectively, are also excluded.
For Δm > 5 GeV/c^{2} an intermediate lifetime stop with m < 52 GeV/c^{2}
is excluded for all mixing angles; for Δm > 2 GeV/c^{2}, the limit is set
to 54 GeV/c^{2} for a loft-handed stop only. (author)$$$$
Proceedings of the Fourth Conference on Nuclear and Particle Physics (NUPPAC-2003) 15 MB - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/37/121/37121561.pdf - Text Version by Comsan, M.N.H.; Hanna, K.M. (eds.) (Nuclear Research Center, Atomic Energy Authority,
Cairo (Egypt)); Egyptian Nuclear Physics Association (ENPA) (Egypt); Egyptian Atomic Energy Authority
(EAEA) (Egypt); Cairo University, Faculty of Science at Fayoum (Egypt) Read MoreCollapse
[en]
The publication's has been set up as a book of the conference of nuclear and particle
physics, it consists of the following chapters (1) high energy physics; (2) nuclear
scattering and reaction; (3) nuclear models and spectroscopy; (3) neutron and reactor
physics; (4) applied nuclear physics; (5) Detectors and Instrumentations; (6) computer
codes and stimulation; (7) radiation measurement and dosimetry; (8) selected topics$$$$