14,085 research outputs found
CHEMICAL AND PHYSICAL CHARACTERISTICS OF M. PSOAS MAIOR FROM ALENTEJANO PIGS AT A VARIOUS LIVE WEIGTHS
The present study was carried out to investigate the evolution of biochemical composition and physical traits of the chemical composition and physical characteristics of muscle Psoas major (PM adipose during growth of Alentejano pigs
The Matrix Element Method and QCD Radiation
The matrix element method (MEM) has been extensively used for the analysis of
top-quark and W-boson physics at the Tevatron, but in general without dedicated
treatment of initial state QCD radiation. At the LHC, the increased center of
mass energy leads to a significant increase in the amount of QCD radiation,
which makes it mandatory to carefully account for its effects. We here present
several methods for inclusion of QCD radiation effects in the MEM, and apply
them to mass determination in the presence of multiple invisible particles in
the final state. We demonstrate significantly improved results compared to the
standard treatment.Comment: 15 pp; v2: references and some clarifications added; v3: discussion
of NLO effects, version published in PR
Gravitation Wave Emission from Radio Pulsars Revisited
We report a new pulsar population synthesis based on Monte Carlo techniques,
aiming to estimate the contribution of galactic radio pulsars to the continuous
gravitational wave emission. Assuming that the rotation periods of pulsars at
birth have a Gaussian distribution, we find that the average initial period is
290 ms. The number of objects with periods equal to or less than 0.4 s, and
therefore capable of being detected by an interferometric gravitational antenna
like VIRGO, is of the order of 5100-7800. With integration times lasting
between 2 and 3 yr, our simulations suggest that about two detections should be
possible, if the mean equatorial ellipticity of the pulsars is
=10. A mean ellipticity an order of magnitude higher increases the
expected number of detections to 12-18, whereas for , no
detections are expectedComment: accepted for publication in A&A, 9 pages, 8 figure
Subleading Logarithmic QED Initial State Corrections to to
Using the method of massive operator matrix elements, we calculate the
subleading QED initial state radiative corrections to the process for the first three logarithmic contributions from
to and compare their effects to the leading
contribution and one more subleading term .
The calculation is performed in the limit of large center of mass energies
squared . These terms supplement the known corrections to
, which were completed recently. Given the high precision at
future colliders operating at very large luminosity, these corrections are
important for concise theoretical predictions. The present calculation needs
the calculation of one more two--loop massive operator matrix element in QED.
The radiators are obtained as solutions of the associated Callen--Symanzik
equations in the massive case. The radiators can be expressed in terms of
harmonic polylogarithms to weight {\sf w = 6} of argument and and
in Mellin space by generalized harmonic sums. Numerical results are
presented on the position of the peak and corrections to the width,
. The corrections calculated result into a final theoretical accuracy
for and which is estimated to be of O(30 keV) at
an anticipated systematic accuracy at the FCC\_ee of \sim 100 keV. This
precision cannot be reached, however, by including only the corrections up to
.Comment: 58 pages, 3 Figure
Dynamics of a superconducting qubit coupled to the quantized cavity field: a unitary transformation approach
We present a novel approach for studying the dynamics of a superconducting
qubit in a cavity. We succeed in linearizing the Hamiltonian through the
application of an appropriate unitary transformation followed by a rotating
wave approximation (RWA). For certain values of the parameters involved, we
show that it is possible to obtain a a Jaynes-Cummings type Hamiltonian. As an
example, we show the existence of super-revivals for the qubit inversion
Continuous matter creation and the acceleration of the universe: the growth of density fluctuations
Cosmologies including continuous matter creation are able to reproduce the
main properties of the standard CDM model, in particular in cases
where the particle and entropy production rates are equal. These specific
models, characterized by a mass density equal to the critical value, behave
like the standard CDM model at early times whereas their late
evolution is similar to the steady-state cosmology. The maximum amplitude of
density fluctuations in these models depends on the adopted creation rate,
related here to the parameter and this limitation could be a
difficulty for the formation of galaxies and large-scale structure in this
class of universe. Additional problems are related with predictions either of
the random peculiar velocities of galaxies or the present density of massive
clusters of galaxies, both being largely overestimated with respect to
observational data.Comment: 11 pages, 2 figures, accepted for publication in General Relativity
and Gravitatio
- …