62 research outputs found
Neutrinoless Double Beta Decay in Light of SNO Salt Data
In the SNO data from its salt run, probably the most significant result is
the consistency with the previous results without assuming the 8B energy
spectrum. In addition, they have excluded the maximal mixing at a very high
confidence level. This has an important implication on the double beta decay
experiments. For the inverted or degenerate mass spectrum, we find
|_{ee}| > 0.013 eV at 95% CL, and the next generation experiments can
discriminate Majorana and Dirac neutrinos if the inverted or degenerate mass
spectrum will be confirmed by the improvements in cosmology, tritium data beta
decay, or long-baseline oscillation experiments.Comment: REVTEX4, three figures. Now uses the updated SK atmospheric data
rather than naive rescaling. Conclusion unchanged. References adde
Leptogenesis, CP violation and neutrino data: What can we learn?
A detailed analytic and numerical study of baryogenesis through leptogenesis
is performed in the framework of the standard model of electroweak interactions
extended by the addition of three right-handed neutrinos, leading to the seesaw
mechanism. We analyze the connection between GUT-motivated relations for the
quark and lepton mass matrices and the possibility of obtaining a viable
leptogenesis scenario. In particular, we analyze whether the constraints
imposed by SO(10) GUTs can be compatible with all the available solar,
atmospheric and reactor neutrino data and, simultaneously, be capable of
producing the required baryon asymmetry via the leptogenesis mechanism. It is
found that the Just-So^2 and SMA solar solutions lead to a viable leptogenesis
even for the simplest SO(10) GUT, while the LMA, LOW and VO solar solutions
would require a different hierarchy for the Dirac neutrino masses in order to
generate the observed baryon asymmetry. Some implications on CP violation at
low energies and on neutrinoless double beta decay are also considered.Comment: 36 pages, 6 figures; new references added, final version to appear in
Nucl. Phys.
Planck early results III : First assessment of the Low Frequency Instrument in-flight performance
Peer reviewe
Refleksi tentang sejarah : Pendapat-pendapat Modern tentang filsafat sejarah./ Ankersmit
xiv, 385 hal.; Ind.; 22 cm
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