institut de física corpuscular - Instituto de Física Corpuscular
... Physics and the first studying particle and nuclear physics.
The mission of IFIC covers a wide range of subjects. In a broad sense, we study the fundamental
interactions (gravitational, electroweak and strong) and the building blocks of matter, considering both
the theoretical and experimental aspec ...
Cortona 2006 6
... A cascade model has been developed to describe
the evolution of the heavy ion collision.
Superposition of elementary collisions (PYTHIA).
Deconfinement transition: relativistic pion gas.
Free parameters are fitted to experimental data.
Particle Physics 2011
... for a new and enhanced collaboration across disciplines
to develop better detection systems for current and future
º the large-scale data management and analysis project,
which is dealing with the rapidly increasing demand in
handling large data sets harvested at ever shorter time
SCIENTIFIC ACHIEVEMENTS OF VLADIMIR GRIBOV LN Lipatov
... After publishing the papers devoted to deep inelastic scattering V. Gribov
began to work on more fundamental problems of QCD which were beyond the
applicability of perturbation theory. He discovered the important property of
nonabelian gauge theories which is known as ”Gribov’s ambiguities” Nucl. P ...
Production and evolution of axion dark matter in the early universe
... it gives some predictions for laboratory experiments. Unfortunately, no signature was observed, and the prototype axion model was ruled out soon after the proposal . However,
it was argued that models with higher symmetry breaking scale denoted as Fa (the axion
decay constant) can still avoid th ...
Introduction to Lattice Field Theory
The path integral and the renormalization group
The path integral formulation
Field theory, divergences, renormalization
Example 1: the central limit theorem
Example 2: the Ising model
Example 3: scalar field theory
Bosons on the lattice
Technicolor theories are models of physics beyond the standard model that address electroweak gauge symmetry breaking, the mechanism through which W and Z bosons acquire masses. Early technicolor theories were modelled on quantum chromodynamics (QCD), the ""color"" theory of the strong nuclear force, which inspired their name.Instead of introducing elementary Higgs bosons to explain observed phenomena, technicolor models hide electroweak symmetry and generate masses for the W and Z bosons through the dynamics of new gauge interactions. Although asymptotically free at very high energies, these interactions must become strong and confining (and hence unobservable) at lower energies that have been experimentally probed. This dynamical approach is natural and avoids issues of Quantum triviality and the hierarchy problem of the Standard Model.In order to produce quark and lepton masses, technicolor has to be ""extended"" by additional gauge interactions. Particularly when modelled on QCD, extended technicolor is challenged by experimental constraints on flavor-changing neutral current and precision electroweak measurements. It is not known what is the extended technicolor dynamics.Much technicolor research focuses on exploring strongly interacting gauge theories other than QCD, in order to evade some of these challenges. A particularly active framework is ""walking"" technicolor, which exhibits nearly conformal behavior caused by an infrared fixed point with strength just above that necessary for spontaneous chiral symmetry breaking. Whether walking can occur and lead to agreement with precision electroweak measurements is being studied through non-perturbative lattice simulations.Experiments at the Large Hadron Collider are expected to discover the mechanism responsible for electroweak symmetry breaking, and will be critical for determining whether the technicolor framework provides the correct description of nature. In 2012 these experiments declared the discovery of a Higgs-like boson with mass approximately 7002125000000000000♠125 GeV/c2; such a particle is not generically predicted by technicolor models, but can be accommodated by them.