Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Plenarvortrag und Hauptvorträge

HK 39.2: Invited Talk

Thursday, March 15, 2007, 09:45–10:15, A

Double Beta Decay, Physics beyond the Standard Model and Nuclear Structure — •Vadim Rodin and Amand Faessler — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Deutschland

Non-vanishing of the neutrino masses discovered in the neutrino oscillation experiments provides an unambiguous evidence for new physics beyond the Standard Model (SM). Massive Majorana neutrinos are predicted in different extensions of the SM, and the neutrinoless double beta decay (0νββ) is an experimentum crucis to reveal the Majorana nature of the neutrinos.

Reliably calculated nuclear matrix elements M^0ν for the 0νββ-decay are crucial in order to determine the absolute neutrino mass scale and to distinguish between possible mechanisms of the decay (exchange of light and heavy neutrinos, SUSY particles, leptoquarks etc). Recent results of M^0ν calculations in different models are discussed in the talk. It is shown how an appropriate account of the experimental 2νββ-decay rates helps to reduce uncertainties in the calculations of M^0ν.