327 research outputs found
The e+ e- -> P1 P2 gamma processes close to the Phi peak: toward a model-independent analysis
We discuss the general decomposition and possible general parameterizations
of the processes , where , , or , for .
Particular attention is devoted to the amplitude where the two pseudoscalar
mesons are in a state, where we propose a general
parameterization which should help to shed light on the nature of light scalar
mesons.Comment: 12 pages, Late
Exotic Bound State Production at Hadron Colliders
Hadronic production of nonrelativistic boundstates of or
isosinglet quarks D with suppressed weak decays is investigated for LHC and SSC
energies. QCD corrections to production and decay rates are incorporated. Large
rates for final states from are predicted.Comment: 7 pages and 13 figures (figures not includes, can be sent upon
request), TTP93-1
and scattering from , forward amplitudes in a QCD eikonal model with a dynamical gluon mass
We examine the photoproduction and the hadronic
total cross sections by means of a QCD eikonal model with a dynamical infrared
mass scale. In this model, where the dynamical gluon mass is the natural
regulator for the tree level gluon-gluon scattering, the and total cross sections are derived from the and forward
scattering amplitudes assuming vector meson dominance and the additive quark
model. We show that the validity of the cross section factorization relation
is
fulfilled depending on the Monte Carlo model used to unfold the hadronic
cross section data, and we discuss in detail the case of
data with GeV
unfolded by the Monte Carlo generators PYTHIA and PHOJET. The data seems to
favor a mild dependence with the energy of the probability () that the
photon interacts as a hadron.Comment: 16 pages, 3 figures; misprints corrected; to appear in Phys. Rev.
Total photoproduction cross-section at very high energy
In this paper we apply to photoproduction total cross-section a model we have
proposed for purely hadronic processes and which is based on QCD mini-jets and
soft gluon re-summation. We compare the predictions of our model with the HERA
data as well as with other models. For cosmic rays, our model predicts
substantially higher cross-sections at TeV energies than models based on
factorization but lower than models based on mini-jets alone, without soft
gluons. We discuss the origin of this difference.Comment: 13 pages, 9 figures. Accepted for publication in EPJC. Changes
concern added references, clarifications of the Soft Gluon Resummation method
used in the paper, and other changes requested by the Journal referee which
do not change the results of the original versio
Ryanodine receptor 1 (RYR1) mutations in two patients with tubular aggregate myopathy
Two likely causative mutations in the RYR1 gene were identified in two patients with myopathy with tubular aggregates, but no evidence of cores or core-like pathology on muscle biopsy. These patients were clinically evaluated and underwent routine laboratory investigations, electrophysiologic tests, muscle biopsy and muscle magnetic resonance imaging (MRI). They reported stiffness of the muscles following sustained activity or cold exposure and had serum creatine kinase elevation. The identified RYR1 mutations (p.Thr2206Met or p.Gly2434Arg, in patient 1 and patient 2, respectively) were previously identified in individuals with malignant hyperthermia susceptibility and are reported as causative according to the European Malignant Hyperthermia Group rules. To our knowledge, these data represent the first identification of causative mutations in the RYR1 gene in patients with tubular aggregate myopathy and extend the spectrum of histological alterations caused by mutation in the RYR1 gene
Forward Physics at the LHC (Elba 2010)
The papers review the main theoretical and experimental aspects of the
Forward Physics at the Large Hadron Collider
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A constitutive description of the anisotropic response of the fascia lata
In this paper we propose a constitutive model to analyze in-plane extension of goat fascia lata. We first perform a histological analysis of the fascia that shows a well-organized bi-layered arrangement of undulated collagen fascicles oriented along two well defined directions. To develop a model consistent with the tissue structure we identify the absolute and relative thickness of each layer and the orientation of the preferred directions. New data are presented showing the mechanical response in uniaxial and planar biaxial extension. The paper proposes a constitutive relation to describe the mechanical response. We provide a summary of the main ingredients of the nonlinear theory of elasticity and introduce a suitable strain-energy function to describe the anisotropic response of the fascia. We validate the model by showing good fit of the numerical results and the experimental data. Comments are included about differences and analogies between goat fascia lata and the human iliotibial band.Organismic and Evolutionary Biolog
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