495 research outputs found
Observability of Inert Scalars at the LHC
In this work we investigate the observability of Inert Doublet Model scalars
at the LHC operating at the center of mass energy of 14 TeV. The signal
production process is leading to two different
final states of and based on
the hadronic and leptonic decay channels of the W boson. All the relevant
background processes are considered and an event selection is designed to
distinguish the signal from the large Standard Model background. We found that
signals of the selected search channels are well observable at the LHC with
integrated luminosity of 300 fb.Comment: v2: 10 pages, 9 figures and 9 table
Excitation of highly charged hydrogen-like ions by the impact of equivelocity electrons and protons: a comparative study
We consider excitation of highly charged hydrogen-like ions by the impact of
equivelocity electrons and protons. The kinetic energy of the protons is more
than three orders of magnitude larger than that of the equivelocity electrons.
It is shown, however, that despite this fact, the electrons can be much more
effective in inducing excitation at collision velocities (slightly) above the
threshold for electron impact excitation. The basic reason for this is the
strong distortion of the motion of the electron by the attractive field of the
nucleus of the highly charged ion.Comment: 5 pages, 5 figure
Excitation of heavy hydrogen-like ions by light atoms in relativistic collisions with large momentum transfers
We present a theory for excitation of heavy hydrogen-like projectile-ions by
light target-atoms in collisions where the momentum transfers to the atom are
very large on the atomic scale. It is shown that in this process the electrons
and the nucleus of the atom behave as (quasi-) free particles with respect to
each other and that their motion is governed by the field of the nucleus of the
ion. The effect of this field on the atomic particles can be crucial for the
contribution to the excitation of the ion caused by the electrons of the atom.
Due to comparatively very large nuclear mass, however, this field can be
neglected in the calculation of the contribution to the excitation due to the
nucleus of the atom.Comment: 15 pages, 2 figure
Relativistic electron-ion recombination in the presence of an intense laser field
Radiative recombination of a relativistic electron with a highly charged ion
in the presence of an intense laser field is considered. Various relativistic
effects, caused by the high energy of the incoming electron and its strong
coupling to the intense laser field, are found to clearly manifest themselves
in the spectra of the emitted -photons.Comment: 4 papes, 2 figure
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