S. Söldner-Rembold

Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO

The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double β decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the means to discriminate different underlying mechanisms for the neutrinoless double β decay by measuring the decay half-life and the electron angular and energy distributions.

Measurement of the Double Beta Decay Half-life of Nd-150 and Search for Neutrinoless Decay Modes with the NEMO-3 Detector

The half-life for double-{beta} decay of {sup 150}Nd has been measured by the NEMO-3 experiment at the Modane Underground Laboratory. Using 924.7 days of data recorded with 36.55 g of {sup 150}Nd, we measured the half-life for 2{nu}{beta}{beta} decay to be T{sub 1/2}{sup 2{nu}}=(9.11{sub -0.22}{sup +0.25}(stat.){+-}0.63(syst.))x10{sup 18} yr. The observed limit on the half-life for neutrinoless double-{beta} decay is found to be T{sub 1/2}{sup 0{nu}}>1.8x10{sup 22} yr at 90% confidence level. This translates into a limit on the effective Majorana neutrino mass of <4.0-6.3 eV if the nuclear deformation is taken into account. We also set limits on models involving Majoron emission, right-handed currents, and transitions to excited states.

Measurement of the strange spectral function in hadronic tau decays

Abstract.Tau lepton decays with open strangeness in the final state are measured with the OPAL detector at LEP to determine the strange hadronic spectral function of the

Measurement of double beta decay of Mo-100 to excited states in the NEMO 3 experiment

\tau

Search for neutrinoless double-beta decay of

lepton. The decays

^{100}Mo

\tau^{-}\rightarrow(K\pi)^{-}\nu_{\tau}

with the NEMO-3 detector

,

Light Higgs production at the Compton collider

(\pi\pi)^{-}\nu_{\tau}

\(\Lambda\) and \(\bar{\Lambda}\) polarization from deep inelastic muon scattering

and

Investigation of double beta decay of 100Mo to excited states of 100Ru

(K\pi\pi\pi)^{-}\nu_{\tau}