institut de física corpuscular - Instituto de Física Corpuscular
... and their phenomenological consequences in the laboratories, to predict the behaviour in future
experiments and, as a final goal, to search for a unified theory of all of them. In parallel, we wish to
know which physical processes occur in the Universe, and how it has evolved from its initial condit ...
Coupling measurement of the Higgs boson and search for heavy
... resonance seems to be a scalar particle which couples to the other particles described
by the Standard Model proportional to their masses. The mass of the particle has been
precisely measured to mH = 125.36 ± 0.41 GeV .
The Higgs boson is dominantly produced at hadron colliders via the gluon-gluo ...
JHEP07(2007)083 - IHEP Diffractive Group
... where αs (µ) ≡ gs2 (µ)/4π is the running coupling.1
This property of Regge poles (tending to constant at t → −∞) is quite general and follows from the fact of their invariance relative to the renormalization group transformations
(the requirement of renorm-invariance is well-grounded by observabilit ...
Particle Physics 2011
... The Helmholtz Alliance “Physics at the Terascale” is coming close to the end of its first five-year funding
cycle. Over the last four years, it has become an important element in the particle physics community in
Germany. The scientific reasons for the existence of the Alliance are as valid as ever: ...
Particle Physics from Stars
... ABSTRACT: Low-mass particles such as neutrinos, axions, other Nambu-Goldstone bosons
and gravitons are produced in the hot and dense interior of stars. Therefore, astrophysical
arguments constrain the properties of these particles in ways which are often complementary to
cosmological arguments and t ...
Matter-wave solitons beyond 1D contact-interaction mean
... is attractive at L< Lz and
repulsive at L> Lz. There is
a maximum in E(L, hence
• In order to stabilize 2D solitary waves in the PS
configuration, it is necessary to reverse dipoledipole behavior, so that side-by-side dipoles
attract each other and head-to-tail dipoles repell
one a ...
The phase diagram of dense QCD
... state of QCD matter can be analyzed in terms of the weak-coupling methods in
QCD. Also we can count on the knowledge from condensed matter physics with
quarks substituting for electrons. In this analogue between electrons in metal and
quarks in quark matter, one may well anticipate that the ground s ...
The impact of mass-loss on the evolution and pre
... For the enhanced mass-loss rate models, we just multiply by
a factor 10 or 25 the mass-loss rates as given by the prescriptions indicated above during the whole period when the star is a
RSG. We consider the star is a RSG when its effective temperature (Teff ), as estimated by the Geneva code, is lo ...
Straw Model - Detailed Information
... parts. It is more interesting though to make a distinction between the straw line being in movement and the
straw line where the effect is not yet felt, that is to catch the moment which shows that in the model the
current speed is the multiple of the speed of the straw charges.
16. Comparing Coulom ...
Simulation study of optical degradation monitoring in the SNO+
... elementary particles. These are the photon, which mediates the electromagnetic force
between charged particles; the gluon, which mediates the strong nuclear force between
particles with colour charge, and the W and Z bosons, which mediates the weak nuclear
And then there is the Higgs boson [8 ...
... Every fundamental symmetry needs to be tested, including Lorentz symmetry.
After the recognition of theoretical processes that create Lorentz violation, testing Lorentz
invariance becomes very exciting
Lorentz and CPT violation has been shown to occur in Planck scale theories, including:
- string th ...
Grand Unified Theory
A Grand Unified Theory (GUT) is a model in particle physics in which at high energy, the three gauge interactions of the Standard Model which define the electromagnetic, weak, and strong interactions or forces, are merged into one single force. This unified interaction is characterized by one larger gauge symmetry and thus several force carriers, but one unified coupling constant. If Grand Unification is realized in nature, there is the possibility of a grand unification epoch in the early universe in which the fundamental forces are not yet distinct.Models that do not unify all interactions using one simple Lie group as the gauge symmetry, but do so using semisimple groups, can exhibit similar properties and are sometimes referred to as Grand Unified Theories as well.Unifying gravity with the other three interactions would provide a theory of everything (TOE), rather than a GUT. Nevertheless, GUTs are often seen as an intermediate step towards a TOE.The novel particles predicted by GUT models are expected to have energies around the GUT scale—just a few orders of magnitude below the Planck scale—and so will be well beyond the reach of any foreseen particle collider experiments. Therefore, the particles predicted by GUT models will be unable to be observed directly and instead the effects of grand unification might be detected through indirect observations such as proton decay, electric dipole moments of elementary particles, or the properties of neutrinos. Some grand unified theories predict the existence of magnetic monopoles.As of 2012, all GUT models which aim to be completely realistic are quite complicated, even compared to the Standard Model, because they need to introduce additional fields and interactions, or even additional dimensions of space. The main reason for this complexity lies in the difficulty of reproducing the observed fermion masses and mixing angles. Due to this difficulty, and due to the lack of any observed effect of grand unification so far, there is no generally accepted GUT model.