5,562 research outputs found
Testing CP and Time Reversal Symmetries with Decays
In this letter, an overview is given for interesting tests of both CP and
Time Reversal symmetries with the beauty baryon . Extensive use of
the helicity formalism and HQET is done for all calculations. Then, emphasis is
put on sophisticated methods like analysis of resonance polarizations and
particular angle distributions which can exhibit a clear signal of TR
violation.Comment: 4 pages, 1 figure, 3 tables. Talk given at the 13th International QCD
Conference 3-7th July 2006 Montpellier (France
Decays into -Vector
A complete study of the angular distributions of the processes, , with and or is performed.
Emphasis is put on the initial polarization produced in the
proton-proton collisions. The polarization density-matrices as well as angular
distributions are derived and help to construct T-odd observables which allow
us to perform tests of both Time-Reversal and CP violation.Comment: 10 pages, 2 figure
A Global Treatment Of VMD Physics Up To The : I. Annihilations, Anomalies And Vector Meson Partial Widths
The HLS Model, equipped with a mechanism providing the breaking of U(3)/SU(3)
symmetry and an isospin symmetry breaking leading naturally to vector meson
mixing, has been recently shown to successfully account for e^+ e^- \ra
\pi^+\pi^- cross section and for the dipion spectrum in decay. The
present study shows that the full anomalous sector of the HLS model can be
considered and is validated by the experimental data. Indeed, this extended
model provides a successful simultaneous fit to the e^+ e^- \ra \pi^+\pi^-
data together with the available data on e^+ e^- \ra \pi^0\gamma, e^+ e^-
\ra \eta\gamma and e^+ e^- \ra \pi^0 \pi^+\pi^- cross sections. It is shown
that the fit of these data sets also predicts an accurate description of the
\eta/\eta^\prime \ra \pi^+ \pi^- \gamma decays fully consistent with the
reported information on their branching fractions and spectra. Finally, one
also derives from our global fits products of widths of the form \Gamma (V \ra
f_1)\Gamma(V \ra e^+ e^-) and ratios of the form \Gamma (V \ra f_1)/\Gamma
(V \ra f_2) describing decays of vector mesons to several non--leptonic final
states.Comment: 58 pages, 10 figures Corrected a few misprints. Footnote 10 change
Pion production in the MiniBooNE
We investigate one pion production processes within the Giessen
Boltzmann--Uehling--Uhlenbeck (GiBUU) coupled channel transport model. Our
calculations for integrated and differential cross sections for realistic
experimental neutrino fluxes are compared to the data recently provided by the
MiniBooNE collaboration.Comment: Talk at NuInt11, Dehradun, India, March 201
A Global Treatment Of VMD Physics Up To The : I. Annihilations, Anomalies And Vector Meson Partial Widths
The HLS Model, equipped with a mechanism providing the breaking of U(3)/SU(3)
symmetry and an isospin symmetry breaking leading naturally to vector meson
mixing, has been recently shown to successfully account for e^+ e^- \ra
\pi^+\pi^- cross section and for the dipion spectrum in decay. The
present study shows that the full anomalous sector of the HLS model can be
considered and is validated by the experimental data. Indeed, this extended
model provides a successful simultaneous fit to the e^+ e^- \ra \pi^+\pi^-
data together with the available data on e^+ e^- \ra \pi^0\gamma, e^+ e^-
\ra \eta\gamma and e^+ e^- \ra \pi^0 \pi^+\pi^- cross sections. It is shown
that the fit of these data sets also predicts an accurate description of the
\eta/\eta^\prime \ra \pi^+ \pi^- \gamma decays fully consistent with the
reported information on their branching fractions and spectra. Finally, one
also derives from our global fits products of widths of the form \Gamma (V \ra
f_1)\Gamma(V \ra e^+ e^-) and ratios of the form \Gamma (V \ra f_1)/\Gamma
(V \ra f_2) describing decays of vector mesons to several non--leptonic final
states.Comment: 58 pages, 10 figures Corrected a few misprints. Footnote 10 change
The pion wave function in covariant light-front dynamics
The structure of the pion wave function in the relativistic constituent quark
model is investigated in the explicitly covariant formulation of light-front
dynamics. We calculate the two relativistic components of the pion wave
function in a simple one-gluon exchange model and investigate various physical
observables: decay constant, charge radius, electromagnetic and transition form
factors. We discuss the influence of the full relativistic structure of the
pion wave function for an overall good description of all these observables,
including both low and high momentum scales.Comment: 12 pages, 10 figure
QCD Factorization in Decays into
Based on the QCD factorization approach we analyse the branching ratios for
the channel . From the comparisons with experimental data
provided by CLEO, BELLE and BABAR we constrain the form factor and propose boundaries for this form factor depending on
the CKM matrix element parameters and .Comment: 11 pages, 9 figures. Talk presented at Fourth Tropical Workshop,
Cairns, Australia, 9--13 June 2003. Proceedings to be published by AI
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