Search for the hypothetical π → μx decay☆
/ Authors
R. Bilger, H. Clement, A. Denig, K. Fohl, P. Hautle, W. Kluge, J. A. Konter, G. Kurz, S. Mango, D. Schapler
and 5 more authors
F. Schonleber, U. Siodlaczek, B. Brandt, G. Wagner, R. Wieser
/ Abstract
Abstract The KARMEN collaboration has reported the possible observation of a hitherto unknown neutral and weakly interacting particle x, which is produced in the decay π+ → μ+x with a mass mx = 33.9 MeV. We have searched for this hypothetical decay branch by studying muons from pion decay in flight with the LEPS spectrometer at the πE3 channel at PSI and find branching ratios BR(π − → μ − x ) −7 and BR(π+ → μ+x)
Journal: Physics Letters B