27,822 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
An inspection on the Borel masses relation used in QCD sum rules
In this work, we studied the Borel masses relation used in QCDSR
calculations. These masses are the parameters of the Borel transform used when
the three point function is calculated. We analised an usual and a more general
linear relations. We concluded that a general linear relation between these
masses provides the best results regarding the standard deviation.Comment: 6 pages, 2 figures, Prepared for 11th Hadron Physic
On the -Dirac Oscillator revisited
This Letter is based on the -Dirac equation, derived from the
-Poincar\'{e}-Hopf algebra. It is shown that the -Dirac
equation preserves parity while breaks charge conjugation and time reversal
symmetries. Introducing the Dirac oscillator prescription,
, in the -Dirac
equation, one obtains the -Dirac oscillator. Using a decomposition in
terms of spin angular functions, one achieves the deformed radial equations,
with the associated deformed energy eigenvalues and eigenfunctions. The
deformation parameter breaks the infinite degeneracy of the Dirac oscillator.
In the case where , one recovers the energy eigenvalues and
eigenfunctions of the Dirac oscillator.Comment: 5 pages, no figures, accepted for publication in Physics Letters
A QCD sum rules calculation of the strong coupling constant
In this work, we calculate the form factors and the coupling constant of the
strange-charmed vertex in the framework of the QCD sum rules
by studying their three-point correlation functions. All the possible off-shell
cases are considered, , and , resulting in three different
form factors. These form factors are extrapolated to the pole of their
respective off-shell mesons, giving the same coupling constant for the process.
Our final result for the coupling constant is .Comment: 17 pages, 4 figure
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