509 research outputs found
Impact of misalignments on the analysis of B decays
This note investigates the effects of a misaligned tracking system on the
analysis of B decays. Misalignment effects of both the vertex locator and the
inner and outer T-stations have been studied. -scaling effects of the vertex
locator are also considered. It is proven that misalignments of the order of
the detector single-hit resolutions have little or negligible effects on the
quality of the reconstruction and of the analysis of B decays. The studies were
performed with a sample of decays, but the impact of
misalignments on the performance of the pattern recognition algorithms and on
the primary vertex resolutions, assessed for the first time, are rather general
and not restricted to decays
Outer Tracker internal alignment toy Monte Carlo studies
The results obtained for the Outer Tracker internal alignment with a toy Monte Carlo are presented and fully described
The DC06 Outer Tracker Simulation
This note gives an overview of the Outer Tracker simulation for the 2006 Data Challenge (DC06). It covers the Outer Tracker detector description used in Gauss/Geant to simulate hits in the Outer Tracker and the digitisation of the hits in Boole. It concludes with the expected performance of the Outer Tracker
The Isoperimetric Profile of a Noncompact Riemannian Manifold for Small Volumes
In the main theorem of this paper we treat the problem of existence of
minimizers of the isoperimetric problem under the assumption of small volumes.
Applications of the main theorem to asymptotic expansions of the isoperimetric
problem are given.Comment: 33 pages, improved version after the referee comments, (Submitted
Evaluating the phase diagram of superconductors with asymmetric spin populations
The phase diagram of a non-relativistic fermionic system with imbalanced
state populations interacting via a short-range S-wave attractive interaction
is analyzed in the mean field approximation. We determine the energetically
favored state for different values of the mismatch between the two Fermi
spheres in the weak and strong coupling regime considering both homogeneous and
non-homogeneous superconductive states. We find that the homogeneous
superconductive phase persists for values of the population imbalance that
increase with increasing coupling strength. In the strong coupling regime and
for large population differences the energetically stable homogeneous phase is
characterized by one gapless mode. We also find that the inhomogeneous
superconductive phase characterized by the condensate is energetically favored in a range of values
of the chemical potential mismatch that shrinks to zero in the strong coupling
regime.Comment: 9 pages, 5 figure
Kaon Condensation in a Nambu--Jona-Lasinio (NJL) Model at High Density
We demonstrate a fully self-consistent microscopic realization of a
kaon-condensed colour-flavour locked state (CFLK0) within the context of a
mean-field NJL model at high density. The properties of this state are shown to
be consistent with the QCD low-energy effective theory once the proper gauge
neutrality conditions are satisfied, and a simple matching procedure is used to
compute the pion decay constant, which agrees with the perturbative QCD result.
The NJL model is used to compare the energies of the CFLK0 state to the parity
even CFL state, and to determine locations of the metal/insulator transition to
a phase with gapless fermionic excitations in the presence of a non-zero
hypercharge chemical potential and a non-zero strange quark mass. The
transition points are compared with results derived previously via effective
theories and with partially self-consistent NJL calculations. We find that the
qualitative physics does not change, but that the transitions are slightly
lower.Comment: 21 pages, ReVTeX4. Clarified discussion and minor change
Factorization Contributions and the Breaking of the Rule in Weak and Couplings
We compute the modified factorization contributions to the
and couplings and
demonstrate that these contributions naturally include terms
which are comparable ( to times) in magnitude to the
corresponding terms. As a consequence, we conclude that models
which treat vector meson exchange contributions to the weak conversion process
assuming such weak couplings to satisfy the rule are unlikely to be reliable.Comment: 13 pages, uses REVTEX Entire manuscript available as a ps file at
http://www.physics.adelaide.edu.au/theory/home.html . Also available via
anonymous ftp at ftp://adelphi.adelaide.edu.au/pub/theory/ADP-95-5.T172.ps To
appear in Physical Review
Nuclear hormone receptor architecture - form and dynamics: The 2009 FASEB Summer Conference on Dynamic Structure of the Nuclear Hormone Receptors
Nuclear hormone receptors (NHRs) represent a large and diverse family of ligand-activated transcription factors involved in regulating development, metabolic homeostasis, salt balance and reproductive health. The ligands for these receptors are typically small hydrophobic molecules such as steroid hormones, thyroid hormone, vitamin D3 and fatty acid derivatives. The first NHR structural information appeared ~20 years ago with the solution and crystal structures of the DNA binding domains and was followed by the structure of the agonist and antagonist bound ligand binding domains of different NHR members. Interestingly, in addition to these defined structural features, it has become clear that NHRs also possess significant structural plasticity. Thus, the dynamic structure of the NHRs was the topic of a recent stimulating and informative FASEB Summer Research Conference held in Vermont
Analytical and numerical evaluation of the Debye and Meissner masses in dense neutral three-flavor quark matter
We calculate the Debye and Meissner masses and investigate chromomagnetic
instability associated with the gapless color superconducting phase changing
the strange quark mass and the temperature . Based on the analytical
study, we develop a computational procedure to derive the screening masses
numerically from curvatures of the thermodynamic potential. When the
temperature is zero, from our numerical results for the Meissner masses, we
find that instability occurs for and gluons entirely in the gapless
color-flavor locked (gCFL) phase, while the Meissner masses are real for ,
, , and until exceeds a certain value that is larger than
the gCFL onset. We then handle mixing between color-diagonal gluons ,
, and photon , and clarify that, among three eigenvalues of the
mass squared matrix, one remains positive, one is always zero because of an
unbroken U(1)_\tilde{Q} symmetry, and one exhibits chromomagnetic instability
in the gCFL region. We also examine the temperature effects that bring
modifications into the Meissner masses. The instability found at large
for , , , and persists at finite into the -quark
color superconducting (uSC) phase which has - and - but no -
quark pairing and also into the two-flavor color superconducting (2SC) phase
characterized by - quark pairing only. The and instability
also goes into the uSC phase, but the 2SC phase has no instability for ,
, and . We map the unstable region for each gluon onto the phase
diagram as a function of and .Comment: 17 pages, 18 figure
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