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FIZIKA B 13 (2004) 1, 243-250
 
ABSOLUTE BRANCHING RATIO NORMALIZATION FOR RARE p+
AND m+ DECAYS IN THE PIBETA EXPERIMENT
EMIL FRLEŽ
(for the PIBETA Collaboration)
University of Virginia, Department of Physics, Charlottesville, VA
22904, USA
Tel: +1-434-924-6786, Fax: +1-434-924-4576,
E-mail address: frlez@virginia.edu
Received 27 October 2003; Accepted 26 April 2004
Online 10 October 2004
We have used the PIBETA detector at the PSI for a precise measurement of rare pion and
muon weak decays. We have collected a large statistical sample of (1) p+®e+ne, (2) p+®p0e+ne, (3) p+®e+neg,
(4) m+®e+ne`nm and (5) m+® e+ne`nmg
decays. We have evaluated the absolute branching ratios for these processes by normalizing
to the independently measured number of decaying p+'s
(or m+'s). We discuss the mutual consistency of the
preliminary results.
PACS numbers: 12.15.Hh, 13.20.Cz, 14.35.Bv, 14.40.Aq, 14.60.Ef
UDC 539.12
Keywords: determination of CKM matrix elements, decays of pions and muons, properties
of pions and muons
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