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65 papers · 1 filter
Grand unified textures for neutrino and quark mixings
Zurab Berezhiani, Anna Rossi
The atmospheric neutrino data imply large mixing between the and states, , while the MSW solution to the solar neutrino problem needs very sm…
Photoproduction of Heavy Vector Mesons at HERA -- A Testfield for Diffraction
R. Fiore, L. L. Jenkovszky, F. Paccanoni
Exclusive diffractive photoproduction of heavy vector mesons (V=phi, J/psi and Upsilon) at HERA is studied in a model employing a dipole Pomeron exchange (P) with an inelastic gamm…
Action for IIB Supergravity in 10 dimensions
G. Dall'Agata, K. Lechner, M. Tonin
We review the construction of a manifestly covariant, supersymmetric and SL(2R) invariant action for IIB supergravity in D=10.
Physics Projects for a Future CERN-LNGS Neutrino Programme
P. Picchi, F. Pietropaolo
We present an overview of the future projects concerning the neutrino oscillation physics in Europe. Recently a joint CERN-LNGS scientific committee has reviewed several proposals…
Gauge-invariant charged, monopole and dyon fields in gauge theories
J. Froehlich, P. A. Marchetti
We propose explicit recipes to construct the euclidean Green functions of gauge-invariant charged, monopole and dyon fields in four-dimensional gauge theories whose phase diagram c…
A Simple Grand Unification View of Neutrino Mixing and Fermion Mass Matrices
Guido Altarelli, Ferruccio Feruglio
Assuming three light neutrinos and the see-saw mechanism we present a semiquantitative model of fermion masses based on (SUSY) SU(5) and abelian horizontal charges. A good descript…
Excitation of the GDR and the Compressional Isoscalar Dipole State by alpha scattering
J. A. Christley, E. G. Lanza, S. M. Lenzi +2
The excitation of the isovector giant dipole resonance (GDR) by alpha scattering is investigated as a method of probing the neutron excess in exotic nuclei. DWBA calculations are p…
Protein structures and optimal folding emerging from a geometrical variational principle
Cristian Micheletti, Jayanth R. Banavar, Amos Maritan +1
Novel numerical techniques, validated by an analysis of barnase and chymotrypsin inhibitor, are used to elucidate the paramount role played by the geometry of the protein backbone…
Gravitational Clustering to All Perturbative Orders
Elcio Abdalla, Roya Mohayaee
We derive the time evolution of the density contrast to all orders of perturbation theory, by solving the Einstein equation for scale-invariant fluctuations. These fluctuations are…
The instanton contributions to Yang-Mills theory on the torus: localization, Wilson loops and the perturbative expansion
L. Griguolo
The instanton contributions to the partition function and to homologically trivial Wilson loops for a U(N) Yang-Mills theory on a torus are analyzed. An exact expression for…
Perspectives for Direct CP Violation Tests in Hyperon Decays
M. Conte, E. Di Salvo, A. Penzo +1
We discuss the perspectives of measuring direct CP violation parameters in hyperon decays by measurements with proton and/or antiproton beams, to be carried out at various faciliti…
Models of Neutrino Masses from Oscillations with Maximal Mixing
Guido Altarelli, Ferruccio Feruglio
We discuss models of neutrino masses that lead to a large mixing angle for atmospheric neutrino oscillations. In particular we study a mechanism where a simple texture for the Dira…
Critical Slowing Down from Wilson RG
Massimo Pietroni
The Thermal Renormalization Group can be employed to study the dynamics of Quantum Field Theories close to second order phase transitions, where neither resummed perturba…
Search for a Technicolor omega_T Particle in Events with a Photon and a b-quark Jet at CDF
The CDF Collaboration, F. Abe
If the Technicolor omega_T particle exists, a likely decay mode is omega_T -> gamma pi_T, followed by pi_T -> bb-bar, yielding the signature gamma bb-bar. We have searched 85 pb^-1…
Chaos in coplanar classical collisions with particles interacting through forces
F. Sattin, L. Salasnich
The scattering among three particles interacting through forces, with opposite charges and widely different masses, is studied in a coplanar geometry. The present work show…
Measurement of the Top Quark Mass with the Collider Detector at Fermilab
F. Abe, CDF Collaboration
We present a new measurement of the top quark mass in events in which both bosons from top quarks decay into lepton (). We use events collected by the CDF exp…
Quantum theory of magnetic quadrupole lenses for spin-1/2 particles
Sameen Ahmed Khan
General guidelines for constructing a quantum theory of charged-particle beam optics starting ab initio from the basic equations of quantum mechanics, appropriate to the situation…
Self-dual tensors and gravitational anomalies in 4n+2 dimensions
Kurt Lechner
Starting from a manifestly Lorentz- and diffeomorphism-invariant classical action we perform a perturbative derivation of the gravitational anomalies for chiral bosons in 4n+2 dime…
On gauge-fixed superbrane actions in AdS superbackgrounds
Paolo Pasti, Dmitri Sorokin, Mario Tonin
To construct actions for describing superbranes propagating in AdS x S superbackgrounds we propose a coset space realization of these superbackgrounds which results in a short poly…
Equivalence Principle: Tunnelling, Quantized Spectra and Trajectories from the Quantum HJ Equation
Alon E. Faraggi, Marco Matone
A basic aspect of the recently proposed approach to quantum mechanics is that no use of any axiomatic interpretation of the wave function is made. In particular, the quantum potent…
Equivalence Principle, Planck Length and Quantum Hamilton-Jacobi Equation
Alon E. Faraggi, Marco Matone
The Quantum Stationary HJ Equation (QSHJE) that we derived from the equivalence principle, gives rise to initial conditions which cannot be seen in the Schroedinger equation. Exist…
Search for New Particles Decaying to b bbar in p pbar Collisions at sqrt{s}=1.8 TeV
F. Abe
We have used 87 pb^-1 of data collected with the Collider Detector at Fermilab to search for new particles decaying to b bbar. We present model-independent upper limits on the cros…
Measurement of the lepton charge asymmetry in W-boson decays produced in p-pbar collisions
F. Abe et. al, The CDF Collaboration
We describe a measurement of the charge asymmetry of leptons from W boson decays in the rapidity range 0<|y_l|<2.5 using W --> enu, munu events from 110+/-7 pb^{-1}of data collecte…
Radiative Neutrino Decay in Media
Dario Grasso, Victor Semikoz
In this letter we introduce a new method to determine the radiative neutrino decay rate in the presence of a medium. Our approach is based on the generalisation of the optical theo…