314 research outputs found
Inclusive Muon Capture in Light Nuclei
We study total muon capture rates in light nuclei, taking into account
renormalizations of the nuclear vector and axial vector strengths. We estimate
the influence in the results of uncertainties of the spin-isospin interaction
parameter and nuclear densities. A few of these reactions are theoretical
benchmarks for physics involving searches for neutrino oscillations. New
experiments in muon capture in several targets are suggested, in the light of
some discrepancies with theory, crudeness of some experimental results and
relevance to neutrino physics.Comment: 11 pages, Latex, no figures. Submitted to Phys.Lett.
Finite size vertex corrections to the three-gluon decay widths of and and a redetermination of at and
We calculate the corrections to the three-gluon decay widths of
and quarkonia due to the finite extension of the vertex function. The widths computed with zero range vertex are
reduced by a factor where for the and
for the . These large corrections necessitate a
redetermination of the values extracted from . We
find and .Comment: 11 pages, HD-TVP-93-0
Inclusive Quasi-Elastic Charged-Current Neutrino-Nucleus Reactions
The Quasi-Elastic (QE) contribution of the nuclear inclusive electron
scattering model developed in Nucl. Phys. A627 (1997) 543 is extended to the
study of electroweak Charged Current (CC) induced nuclear reactions, at
intermediate energies of interest for future neutrino oscillation experiments.
The model accounts for, among other nuclear effects, long range nuclear (RPA)
correlations, Final State Interaction (FSI) and Coulomb corrections.
Predictions for the inclusive muon capture in C and the reaction
C near threshold are also given. RPA correlations are
shown to play a crucial role and their inclusion leads to one of the best
existing simultaneous description of both processes, with accuracies of the
order of 10-15% per cent for the muon capture rate and even better for the LSND
measurement.Comment: 31 pages and 14 figures, accepted for publication as a regular
article in Physical Review
Isoscalar S-wave π–π interaction in the nuclear medium
The s-wave isoscalar π π scattering amplitude in a nuclear medium has been evaluated using a non-perturbative unitary coupled channels method and the standard chiral Lagrangians. The method is successful describing the π π properties in vacuum, in the scalar-isoscalar channel up to 1.2 GeV giving rise to poles in the T matrix for the ƒ0(980) and the σ. The extension of the method to the nuclear medium implies the renormalization of the pions in the medium and also the introduction of interaction terms related to contact terms in the πN → ππN reaction.Vicente Vacas, Manuel Jose, [email protected]
; Oset Baguena , Eulogio, [email protected]
Recent N^* Results From J/\psi Decays
Based on 7.8 million J/\psi events collected at BEPC, the events for J/\psi
\to p\bar{p}\pi^0 and p\bar{p}\eta have been selected and reconstructed. Clear
peaks are observed around 1480 MeV in p\pi^0 (\bar{p}\pi^0) invariant mass
spectrum and near the threshold for production in p\eta(\bar{p}\eta)
invariant mass spectrum. A partial wave analysis of J/\psi \to p\bar{p}\eta
data has been performed. Two J^P={1/2}^- resonances are observed with mass and
width (M, \Gamma) at (1540^{+15}_{-17}, 178^{+20}_{-22}) MeV and
(1648^{+18}_{-16}, 150)MeV, and are considered to be the nucleon resonances
S_{11}(1535) and S_{11}(1650) respectively.Comment: 4 pages, 4 figures, proceedings for Hadron9
Recent progress on the chiral unitary approach to meson meson and meson baryon interactions
We report on recent progress on the chiral unitary approach, analogous to the
effective range expansion in Quantum Mechanics, which is shown to have a much
larger convergence radius than ordinary chiral perturbation theory, allowing
one to reproduce data for meson meson interaction up to 1.2 GeV. Applications
to physical processes so far unsuited for a standard chiral perturbative
approach are presented. Results for the extension of these ideas to the meson
baryon sector are discussed, together with applications to kaons in a nuclear
medium and atoms.Comment: Contribution to the KEK Tanashi Symposium on Physics of Hadrons and
Nuclei, Tokyo, December 1998, 10 pages, 3 postscript figures. To be published
as a special issue of Nuclear Physics
Novel hybrid vesicles co-assembled from a cationic lipid and PAAc-g-mPEG with pH-triggered transmembrane channels for controlled drug release
This work presents an important example of novel hybrid vesicles with pH-triggered transmembrane channels prepared by co-assembly of poly(acrylic acid)-g-poly(monomethoxy ethylene glycol) (PAAc-g-mPEG) with a cationic lipid, didodecyldimethylammonium bromide (DDAB), via electrostatic interaction for effective doxorubicin (DOX) release
Neutrino and axion hot dark matter bounds after WMAP-7
We update cosmological hot dark matter constraints on neutrinos and hadronic
axions. Our most restrictive limits use 7-year data from the Wilkinson
Microwave Anisotropy Probe for the cosmic microwave background anisotropies,
the halo power spectrum (HPS) from the 7th data release of the Sloan Digital
Sky Survey, and the Hubble constant from Hubble Space Telescope observations.
We find 95% C.L. upper limits of \sum m_\nu<0.44 eV (no axions), m_a<0.91 eV
(assuming \sum m_\nu=0), and \sum m_\nu<0.41 eV and m_a<0.72 eV for two hot
dark matter components after marginalising over the respective other mass. CMB
data alone yield \sum m_\nu<1.19 eV (no axions), while for axions the HPS is
crucial for deriving m_a constraints. This difference can be traced to the fact
that for a given hot dark matter fraction axions are much more massive than
neutrinos.Comment: 9 pages, 3 figures, uses iopart.cls; v2: one additional figure,
references added, version accepted by JCA
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