First Evidence for Lepton Number Violation - the 76GE Double Beta Experiment in Gran Sasso 1990-2003

Details First Evidence for Lepton Number Violation - the 76GE Double Beta Experiment in Gran Sasso 1990-2003 First Evidence for Lepton Number Violation - the 76GE Double Beta Experiment in Gran Sasso 1990-2003

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasc.conf..174k&link_type=abstract

PASCOS 2004 Part I: Particles, Strings and Cosmology* Part II: Themes in Unification -- The Pran Nath Festschrift†. *,†Proceedin

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The HEIDELBERG-MOSCOW experiment operating 11kg of enriched 76Ge in the GRAN SASSO Underground Laboratory, is one of the long-running underground experiments. It is the most sensitive double beta decay experiment since more than ten years. The analysis of the data taken from 2 August 1990 - 20 May 2003, is presented here. The collected statistics is 71.7 kg y. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/ kg y keV. The two-neutrino accompanied half-life is determined on the basis of more than 100 000 events to be (1.74.-0.16+0.18) × 1021 years. The confidence level for the neutrinoless signal has been improved to a 4.2σ level. The half-life is T1/20ν = (1.19-0.23+0.37) × 1025 years. Fundamental consequences of this first evidence for neutrinoless double beta decay is that total lepton number is not conserved, and that the neutrino is a Majorana particle, and further, that only a degenarate neutrino mass model is allowed. The effective neutrino mass deduced is (0.2 - 0.6) eV (99.73% c.l.). The HEIDELBERG-MOSCOW experiment yields sharp restrictions also for other beyond standard model physics. These include SUSY models (R-parity breaking, sneutrino mass), leptoquarks (leptoquark-Higgs coupling), compositeness, right-handed W boson mass, test of special relativity and equivalence principle in the neutrino sector and others. These results are comfortably competitive to corresponding results from high-energy accelerators like TEVATRON, HERA, etc.

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