H.-J. Gerber
ETH Zurich
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Publication
Featured researches published by H.-J. Gerber.
Physics Letters B | 1987
I. Beltrami; H. Bukkard; R.D. Von Dincklage; W. Fetscher; H.-J. Gerber; K.F. Johnson; E. Pedroni; M. Salzmann; F. Schenk
Abstract The positron directional distribution following muon decay is measured. The polarized muons are derived from pion decay in flight and are brought to rest in Be metal. Using the μSR-technique Pμξ = 1.0027 ±0.0084 is deduced. The integral asymmetry parameters ξ bears on the mass of the W (wino, the supersymmetrical partner of the gauge boson W), mediating such decay as μ→ e v v . Assuming very light scalar neutrini m v ⪡mμ a new lower limit on the wino mass m w >270 GeV /c 2 (90% CL) is inferred.
Physics Letters B | 1977
H.P. Povel; W. Dey; H.K. Walter; H.-J. Pfeiffer; U. Sennhauser; J. Egger; H.-J. Gerber; M. Salzmann; A. van der Schaaf; W. Eichenberger; R. Engfer; E.A. Hermes; F.W. Schlepütz; U. Weidmann; C. Petitjean; W.H.A. Hesselink
Abstract A search for the decay μ+→e+e+e−, in which no candidate was found, yields a new upper limit for the branching ratio Rμ→3e μ + → e + e + e − ν ν decays were observed, in agreement both in number and momentum distribution with V - A theory.
