Fukihiko Suekane (Tohoku Univ., Japan / APC laboratory, France): Sterile Neutrino Experiment JSNS^2: The direct test of the LSND anomaly.

lundi 19 févr. 2018, 14:00 → 16:00 Europe/Paris

     In the standard model of elementary particles, the number of neutrino                                                                                    
    flavors is 3. However, there are experimental indications that require                                                                                    
    4th neutrino, called "sterile neutrino". Among such experiments, LSND                                                                                     
    experiment showed the most significant indication. The LSND experiment                                                                                    
    observed excess of nu_e in nu_mu beam from muon decay at rest. If it is                                                                                   
    due to neutrino oscillation, the observed Dm^2 is inconsistent with the                                                                                   
    three flavor neutrino oscillations and it requires the sterile neutrino.                                                                                  
    However, this result has not been considered as definite one and it has                                                                                   
    been thought that the definite test is necessary.                                                                                                         
     In order to test the LSND experiment directly, JSNS^2 experiment is                                                                                      
    being prepared at J-PARC in Japan. The JSNS^2 experiment uses the same                                                                                    
    decay at rest neutrino and the same neutrino detection mechanism as were                                                                                  
    used in the LSND experiment.  Yet, S/N is much better using the pulsed                                                                                    
    beam and Gd-loaded liquid scintillator.                                                                                                                   
     In this talk, I will describe the neutrino oscillations and sterile                                                                                      
    neutrino anomalies from the basics and explain about the JSNS^2                                                                                           
    experiment.