SciPost Submission Page
The SINDRUM-I Experiment
by Ralph Eichler and Christoph Grab
Submission summary
| Authors (as registered SciPost users): | Christophorus Grab |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202012_00016v2 (pdf) |
| Date accepted: | Feb. 10, 2021 |
| Date submitted: | Feb. 3, 2021, 2:21 p.m. |
| Submitted by: | Christophorus Grab |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
SINDRUM-I was the first nearly 4 spectrometer at SIN. It was initially designed to 9 search for the forbidden decay + ! e+ee+ , but also successfully studied various 10 other processes with high precision. The upper limit obtained for the branching ratio of B!3e = (+ ! e+ee+ )= (+ ! e+e¯ 11 ) < 1.0 1012(90% CL) from 1988 is still the best. The first statistically significant observation of the rare decay + ! e+ee+e¯ 12 , achieved in 1985, yielded a branching ratio of B13 !3e2 = (3.40.20.2)105. Several 14 othermeasurements of rare decays were undertaken: the first observation of the -decay 15 + !e+eee+ resulted in (+ !e+eee+ )= (+ !+ ) = (3.2 0.5 0.2) 109, 16 also still the best measurement; and a determination of the ratio of the weak axial- to 17 vector-form factor FA=FV = (0.7 0.5), resolving an ambiguity. In addition, upper limits 18 for + ! e+ and + ! e+e with subsequent decay ! e+e (search for "massless" Goldstone bosons) and 0 !e+e 19 < 1.3 107 were obtained.
Published as SciPost Phys. Proc. 5, 007 (2021)