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[en] J-PARC E36 experiment is searching for a violation of lepton universality by precisely measuring the ratio of the kaon decay widths R_K = Γ(K"+ → e"+ν)/Γ(K"+ → μ"+ν). Any deviation of the experimentally determined R_K from the Standard Model prediction directly indicates the presence of new physics. The experiment will be performed using a stopped K"+ beam with the detector apparatus based on a 12-sector superconducting iron-core toroidal spectrometer and a CsI(Tl) calorimeter. R_K can be obtained from the accepted K"+ → e"+ν and K"+ → μ"+ν event ratio corrected for the detector acceptance ratio. The total size of the experimental uncertainty is estimated to be 0.25%. (author)
Source
Physical Society of Japan, Tokyo (Japan); 1360 p; ISBN 978-4-89027-112-2; 
; Sep 2015; p. 024009.1-024009.4; 2. international symposium on science at J-PARC; Tsukuba, Ibaraki (Japan); 12-15 Jul 2014; Available from http://dx.doi.org/10.7566/JPSCP.8.024009; 9 refs., 1 fig.
; Sep 2015; p. 024009.1-024009.4; 2. international symposium on science at J-PARC; Tsukuba, Ibaraki (Japan); 12-15 Jul 2014; Available from http://dx.doi.org/10.7566/JPSCP.8.024009; 9 refs., 1 fig.