5,312,293 research outputs found
BaBar B Decay Results
Data from the first run of the BaBar detector at the PEP II accelerator are
presented. Measurements of many rare B decay modes are now possible using the
large data sets currently being collected by BaBar. An overview of analysis
techniques and results on data collected in 2000 are described.Comment: 16 pages, 35 figures. Submission to Lepton-Photon 2001 Rome
conference proceeding
Spinor model of a perfect fluid
Different characteristic of matter influencing the evolution of the Universe
has been simulated by means of a nonlinear spinor field. We have considered two
cases where the spinor field nonlinearity occurs either as a result of
self-action or due to the interaction with a scalar field.Comment: 5 pages, some misprints are corrected, some new expressions are adde
Topological expansion and boundary conditions
In this article, we compute the topological expansion of all possible
mixed-traces in a hermitian two matrix model. In other words we give a recipe
to compute the number of discrete surfaces of given genus, carrying an Ising
model, and with all possible given boundary conditions. The method is
recursive, and amounts to recursively cutting surfaces along interfaces. The
result is best represented in a diagrammatic way, and is thus rather simple to
use.Comment: latex, 25 pages. few misprints correcte
Real and Image Fields of a Relativistic Bunch
We derive analytical expressions for external fields of a charged
relativistic bunch with a circular cross section. At distances far from the
bunch, the field reduces to the relativistic modified Coulomb form and in the
near region, reproduce the external fields of a continuous beam. If the bunch
is surrounded by conducting surfaces, the bunch self-fields are modified. Image
fields generated by a bunch between two parallel conducting planes are studied
in detail. Exact summation of image fields by the direct method invented by
Laslett allows the infinite series to be represented in terms of elementary
trigonometric functions.Comment: 10 page
- …