Abstract:
The
separate effects that an electric and a magnetic field would have on the total
energy and spin of an elementary electron state have been computed in a
theoretical quantum field theory framework. It is shown that all the effects in
this process, that are defined “fermion epigenetics”, can be expressed in a
simple and elegant way in terms of the components of the electron field, called
“psinons” in this approach. In the minimal interaction prescription, the
electric and the magnetic effects can be separated into the sum of “classical”
components reproducing conventional Stark and Zeeman effects, and new
components of different type. In the non-relativistic limit, the two residual
effects on the energy only depend on the electron intrinsic properties, i.e. its charge and its spin, and on the
value of the electric and magnetic potentials. A comparison with the results
obtainable in a Pauli formalism approach is discussed and, finally, a very qualitative
calculation of the size of possible effects is performed.

We compute in a theoretical quantum field theory
framework the effects that a classic environment will have on an elementary one-fermion
state, assumed for simplicity to be that of one electron, in the presence of a
magnetic field. We consider its total energy and its spin angular momentum as
relevant observables of the state. We show that the changes of these quantities
produced by the combined environmental and magnetic effects can be expressed in
a simple and compact form. We obtain expressions that only depend on the values
of the external environment and magnetic fields, and on the special spin
features of the free fermion state. We call these effects “fermion
epigenetics” and try to motivate this definition discussing possible relevant
analogies with the corresponding medical treatment of epigenetics in organic
cells.

We consider the effects that a magnetic field has on the observable
properties of an elementary one-fermion state, assumed for simplicity to be
that of one electron. We show that for a weak intensity of the field these
effects can be very simply computed in a quantum field theory theoretical
framework, assuming the minimal form of the electromagnetic interaction and the
validity of the Dirac equation. The effects proceed via preliminary, magnetic
field induced, modification of the four components of the spinor field. These
generate consequent modifications of the various observable properties of the
fermion, which can always be simply expressed in terms of the four spinor field
components. A few general features of the various effects are discussed, and a
number of possible analogies with the fascinating medical description of the
epigenetic process for an organic cell are finally proposed.

Abstract:
This short note is devoted to non-proficient in physics. Its purpose is that of proposing a possible universal connection between the definition of Action given by Goethe in his ``Faust'' tragic play and the Hamilton's Principle of the Minimal Action. This Principle is one of the most general ways of formulating the dynamics of a physical system both in classical and in quantum physics. The recent discovery of the long time searched Higgs particle may be seen as the most spectacular successful confirmation of the Standard Model formalism based on the Minimal Action Principle. Supported by this experimental confirmation, we propose a possible general meaning of the Principle, inspired by the Goethe's ``Faust'' tragic play.

I consider, in a Quantum Field Theory theoretical approach, the effects of an electromagnetic field on the components of the total angular momentum of an elementary fermion system, assuming the “minimal” form of the relative interaction. When the electromagnetic field can be treated as a classical one, these effects are particularly simple to be computed and exhibit a number of very general characteristic features in the case of a constant magnetic field. A qualitative possible analogy with similar features of an elementary organic system is finally proposed.

Abstract:
We discuss New Physics effects in fermion pair production at LC in the framework of the ``Z-peak subtracted approach'', a theoretical scheme that exploits the experimental measurements at LEP1 and SLC as input parameters. In particular, we discuss the role of the longitudinal polarization asymmetry $A_{LR,\mu}$ which turns out to be a very sensitive probe to New Physics of universal type. The extension of the method to non universal effects is discussed and an application is given in two examples: general contact interactions and low energy gravity models with graviton exchange.

Abstract:
We have evaluated the one loop correction to the bound on the lightest Higgs mass valid in the minimal, $ E_{6}$ based, supersymmetric $ \eta$ model. Under the assumption that the theory remains perturbative up to the $10^{16}$ GeV scale, we derive a conservative bound that decreases with the top mass for $M_t \leq 2 M_W$ and varies from $ \sim 160$ GeV to $\sim 145$ GeV when $90 \leq M_t \leq 200$ GeV.

Abstract:
We calculate, using a Z-peak subtracted representation of four-fermion processes previously illustrated for the case of electron-positron annihilation into charged lepton-antilepton, the corresponding expressions of the new physics contributions for the case of final quark-antiquark states, allowing the possibility of both universal and non universal effects. We show that, in each case, the main result obtained for the final lepton channel can be generalized, so that every experimentally measurable quantity can be expressed in terms of input parameters \underline{measured} on Z resonance, of $\alpha(0)$ and of a small number of subtracted one loop expressions. Some examples of models are considered for several c.m. energy values, showing that remarkable simplifications are often introduced by our approach. In particular, for the case of a dimension-six lagrangian with anomalous gauge couplings, the same reduced number of parameters that would affect the observables of final leptonic states are essentially retained when one moves to final hadronic states. This leads to great simplifications in the elaboration of constraints and, as a gratifying byproduct, to the possibility of making the signal from these models clearly distinguishable from those from other (both universal and non universal) competitors.

Abstract:
It is shown that, at a 500 GeV LC, a number of different theoretical models would be unambigously identified by their virtual effects. Negative limits in case of no signal identification are also derived.

Abstract:
The theoretical merits of longitudinal polarization asymmetries of electron-positron annihilation into two final fermions at future colliders are examined, using a recently proposed theoretical description. A number of interesting features, valid for searches of virtual effects of new physics, is underlined, that is reminiscent of analogous properties valid on top of $Z$ resonance. As an application to a concrete example, we consider the case of a model with triple anomalous gauge couplings and show that the additional information provided by these asymmetries would lead to a drastic reduction of the allowed domain of the relevant parameters.