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Updated: May 27, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Experimental validation of the largest calculated isospin-symmetry-breaking effect in a superallowed Fermi decay
D Melconian1, S Triambak, C Bordeanu
1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA. dmelconian@physics.tamu.edu
Abstract:
A precision measurement of the γ yields following the β decay of (32)Cl has determined its isobaric-analogue branch to be (22.47(-0.18)(+0.21))%. Since it is an almost pure-Fermi decay, we can also determine the amount of isospin-symmetry breaking in this superallowed transition. We find a very large value, δ(C) = 5.3(9)%, in agreement with a shell-model calculation. This result sets a benchmark for isospin-symmetry-breaking calculations and lends support for similarly calculated, yet smaller, corrections that are currently applied to 0+ → 0 + transitions for tests of the standard model.
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