5,380,766 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
Charged Particle Multiplicities in Ultra-relativistic Au+Au and Cu+Cu Collisions
The PHOBOS collaboration has carried out a systematic study of charged
particle multiplicities in Cu+Cu and Au+Au collisions at the Relativistic
Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory. A unique feature
of the PHOBOS detector is its ability to measure charged particles over a very
wide angular range from 0.5 to 179.5 deg. corresponding to |eta|<5.4. The
general features of the charged particle multiplicity distributions as a
function of pseudo-rapidity, collision energy and centrality, as well as system
size, are discussed.Comment: Proceedings of "Lake Louise Winter Institute 2006", Lake Louise,
Alberta, Canada, February 17-23, 2006, World Scientific 5 pages, 3 figure
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