293 research outputs found
Mirror matter admixtures in K_S to gamma gamma
The latest measurement of the K_S to gamma gamma branching ratio clearly
shows an enhancement over the current theoretical prediction. As in other K and
B meson decays, this invites to consider the possibility of the contribution of
new physics. We study a particular form of the latter, which may be referred to
as manifest mirror symmetry. The experimental data are described using
previously determined values for the mixing angles of the admixtures of mirror
matter in ordinary hadrons and by assuming that for pi^0, eta, eta', the mirror
decay amplitudes have the same magnitudes as their ordinary counterparts
decay channel in the ATLAS -mixing studies
It is shown, using a track-level simulation, that the use of the decay channel for reconstruction, in additioon with the
previously studied mode, enables two fold gain in the
ATLAS -mixing signal statistics through
-decay channel. A new modification of the amplitude fit method is
suggested for the determination. Some general aspects of the
-mixing phenomenon is illustrated by pictures of Casimir Malevich,
Maurits Cornelis Escher and Salvador Dali.Comment: 23 pages, LaTex, 7 figures and 4 picture
Supernova explosions, 511 keV photons, gamma ray bursts and mirror matter
There are three astroparticle physics puzzles which fire the imagination: the
origin of the ``Great Positron Producer'' in the galactic bulge, the nature of
the gamma-ray bursts central engine and the mechanism of supernova explosions.
We show that the mirror matter model has the potential to solve all three of
these puzzles in one beautifully simple strike.Comment: about 9 page
Quark loop contribution to \pi^0 \to 4\gamma
We find the contribution of constituent quark loop mechanism to the branching
ratio B_{4\gamma} = \Gamma_{4\gamma}/\Gamma_{4\gamma} \sim 5.45 \cdot 10^{-16}
for the reasonable choice of constituent quark mass m \sim 280 MeV. This result
is in agreement with vector-dominance approach result obtained years ago. Thus
the main contribution arises from QED mechanism \pi^0 \to \gamma (\gamma^*) \to
\gamma (3\gamma) including light-light scattering block with electron loop.
This contribution was investigated in paper of one of us and gave B_{4\gamma}
\sim 2.6 \cdot 10^{-11}.Comment: 7 pages, 2 figure
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