Séminaire commun SPhT-DAPNIA
A. Curioni, M. Cirelli, S. Lavignac
Yale, SPhT, SPhT
Lundi 21/05/2007, 15:00
Salle André Berthelot, Bâtiment 141, Saclay
1) First results from the MiniBooNE oscillation experiment (A. Curioni, Yale) \vskip .5cm I will report the initial results from a search for oscillations of muon neutrino to electron neutrino performed by the MiniBooNE Collaboration. MiniBooNE was motivated by the result from the LSND experiment which presented evidence for oscillations at the $\Delta m^2$ scale around 1 eV$^2$. The MiniBooNE experiment uses a high intensity neutrino beam produced by protons from the Fermilab Booster accelerator. The average muon neutrino energy for this beam is $\sim$ 800 MeV. Neutrinos are detected in 1 kton pure mineral oil instrumented with about 1500 photomultiplier tubes. The detector is placed 540 m away from the production target and is used to disciminate between muon and electron neutrino events, and to measure the energy of the neutrinos. MiniBooNE performed a ``blind'' analysis, where all analysis selections and fitting procedures are determined before candidate electron neutrino events are examined. Results of this analysis will be presented for the current neutrino mode data set corresponding to 5.58 1020 protons on target. \vskip 1cm 2) Exotic neutrino physics in the light of LSND, MiniBooNE and other neutrino data: a short review (M. Cirelli \& S. Lavignac, SPhT) \vskip .5cm We review several non-standard phenomena in neutrino physics (mixing with sterile neutrinos, mass varying neutrinos, CPT violation, Lorentz invariance violation...), and discuss the main constraints on these scenarios coming from particle physics, astrophysics and cosmology. The implications of the recent MiniBooNE results are also discussed
on a qualitative basis.