Hot Dark Matter and Neutrinoless Double Beta Decay:. World Status of the Field

Details Hot Dark Matter and Neutrinoless Double Beta Decay:. World Status of the Field Hot Dark Matter and Neutrinoless Double Beta Decay:. World Status of the Field

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dmap.conf..442k&link_type=abstract

DARK MATTER IN ASTROPARTICLE AND PARTICLE PHYSICS. Proceedings of the 6th International Heidelberg Conference. Held 24-28 Septem

Physics

Total Lepton Number Violation, Majorana Nature Of The Neutrino, Neutrino Mass And Mixing, Beta-Decay, Double Beta Decay, Heidelberg-Moscow Experiment, High Purity Ge Detectors, Hot Dark Matter In The Universe

Scientific paper

A final independent analysis of the data of the 76Ge experiment in Gran Sasso (HEIDELBERG-MOSCOW experiment) which is since 15 years the worldwide by far most sensitive double beta experiment, is presented for the main set of data taken in the period Nov. 1995 - May 2003.4,5 In this period the time structure of all events have been registered. Two different methods of pulse shape analysis4,5,7-9,15,17-19 lead to selection of potential 0νββ events at Qββ with almost no γ-background in a wide range around Qββ. The background achieved in the energy region of the Qββ value for double beta decay is 5.10-3 events kg-1yr-1keV-1. A line at Qββ is observed at a confidence level of more than 6σ. The identification of this line as signal of neutrinoless double beta decay is the most reasonable explanation. This means total lepton number violation and a Majorana nature of the neutrino as fundamental consequences for particle physics. The half-life for this process is determined to be <=ft(2.23+0.44-0.31(stat); ) × 1025 y. Assuming vanishing right-handed weak currents or other more exotic contributions to the 0νββ decay amplitude, a value of < m > = <=ft (0.32+0.03-0.03 ; ) eV is derived. Normalizing the nuclear matrix element for 2νββ decay to the experimental value, the lower limit for could be lower, down to 0.22 eV. With this value neutrinos contribute at least 4.7% to the dark matter in the Universe.

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