178 research outputs found
Constraining Bilinear R-Parity Violation from Neutrino Masses
We confront the R-parity violating MSSM model with the neutrino oscillation
data. Investigating the 1-loop particle-sparticle diagrams with additional
bilinear insertions on the external neutrino lines we construct the relevant
contributions to the neutrino mass matrix. A comparison of the so-obtained
matrices with the experimental ones assuming normal or inverted hierarchy and
taking into account possible CP violating phases, allows to set constraints on
the values of the bilinear coupling constants. A similar calculation is
presented with the input from the Heidelberg-Moscow neutrinoless double beta
decay experiment. We base our analysis on the renormalization group evolution
of the MSSM parameters which are unified at the GUT scale. Using the obtained
bounds we calculate the contributions to the Majorana neutrino transition
magnetic moments.Comment: I've decided to move the collection of my papers to arXiv for easier
acces
Critical point calculation for binary mixtures of symmetric non-additive hard disks
We have calculated the values of critical packing fractions for the mixtures
of symmetric non-additive hard disks. An interesting feature of the model is
the fact that the internal energy is zero and the phase transitions are
entropically driven. A cluster algorithm for Monte Carlo simulations in a
semigrand ensemble was used. The finite size scaling analysis was employed to
compute the critical packing fractions for infinite systems with high accuracy
for a range of non-additivity parameters wider than in the previous studies.Comment: 8 pages, 4 figure
Extra Dimensions and Neutrinoless Double Beta Decay Experiments
The neutrinoless double beta decay is one of the few phenomena, belonging to
the non-standard physics, which is extensively being sought for in experiments.
In the present paper the link between the half-life of the neutrinoless double
beta decay and theories with large extra dimensions is explored. The use of the
sensitivities of currently planned experiments: DAMA, CANDLES,
COBRA, DCBA, CAMEO, GENIUS, GEM, MAJORANA, MOON, CUORE, EXO, and XMASS, gives
the possibility for a non-direct `experimental' verification of various extra
dimensional scenarios. We discuss also the results of the Heidelberg--Moscow
Collaboration. The calculations are based on the Majorana neutrino mass
generation mechanism in the Arkani-Hamed--Dimopoulos--Dvali model.Comment: I've decided to move the collection of my papers to arXiv for easier
acces
Nuclear Matrix Elements and Neutrino Magnetic Moments
We compare different methods of obtaining the neutrinoless double beta decay
nuclear matrix elements (NME). On the example of 76Ge we use the NME to
calculate the Majorana neutrino transition magnetic moments, generated through
particle-sparticle R-parity violating loop diagrams whithin the minimal
supersymmetric standard model.Comment: I've decided to move the collection of my papers to arXiv for easier
access. Proceedings of the Nuclear Physics Workshop in Kazimierz Dolny,
Poland, 200
Neutralino Induced Majorana Neutrino Transition Magnetic Moments
We calculate the effect of neutrino-neutralino mixing on the neutrino
magnetic moment and compare it with the contribution of pure particle-sparticle
loop. We have found that the dominated mechanism is still the bare loop, and
that the bilinear insertions on the external neutrino lines contribute at least
one order of magnitude weaker.Comment: I've decided to move the collection of my papers to arXiv for easier
access. Proceedings of the Nuclear Physics Workshop in Kazimierz Dolny,
Poland, 200
Neutrinoless double beta decay constrained by the existence of large extra dimensions
We present the possible influence on the half-life of neutrinoless double
beta decay coming from the existence of extra spatial dimensions. The
half-life in question depends on the mass of the electron neutrino. We base our
analysis on the Majorana neutrino mass mechanism in
Arkani-Hamed--Dimopoulos--Dvali model.Comment: I decided to move the collection of my papers to arXiv for easier
access. Proceedings of the Nuclear Physics Workshop in Kazimierz Dolny,
Poland, 200
Nuclei with Tetrahedral Symmetry
We discuss a point-group-theory based method of searching for new regions of
nuclear stability. We illustrate the related strategy with realistic
calculations employing the tetrahedral and the octahedral point groups. In
particular, several nuclei in the Rare Earth region appear as excellent
candidates to study the new mechanism.Comment: 18 pages, 4 figures, submitted to International Journal of Modern
Physics
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