Measurements of charged kaon semileptonic decay branching fractions K-+/-->pi(0)mu(+/-)nu and K-+/-->pi(0)e(+/-)nu and their ratio
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Accepted version
Author(s)
Type
Journal Article
Abstract
Measured ratios of decay rates for RKe3/K2π, RKµ3/K2π and RKµ3/Ke3 are presented. These
measurements are based on K± decays collected in a dedicated run in 2003 by the NA48/2 experiment
at CERN. The results obtained are RKe3/K2π = 0.2496± 0.0009(stat)± 0.0004(syst) and RKµ3/K2π =
0.1637±0.0006(stat)±0.0003(syst). Using the PDG average for the K± → π±π0 normalisation mode, both
values are found to be larger than the current values given by the particle data book and lead to a larger
magnitude of the |Vus| CKM element than previously accepted. When combined with the latest particle data
book value of |Vud|, the result is in agreement with unitarity of the CKM matrix. In addition, a new measured
value of RKµ3/Ke3 = 0.656±0.003(stat)±0.001(syst) is compared to the semi-empirical predictions
based on the latest form factor measurements.
measurements are based on K± decays collected in a dedicated run in 2003 by the NA48/2 experiment
at CERN. The results obtained are RKe3/K2π = 0.2496± 0.0009(stat)± 0.0004(syst) and RKµ3/K2π =
0.1637±0.0006(stat)±0.0003(syst). Using the PDG average for the K± → π±π0 normalisation mode, both
values are found to be larger than the current values given by the particle data book and lead to a larger
magnitude of the |Vus| CKM element than previously accepted. When combined with the latest particle data
book value of |Vud|, the result is in agreement with unitarity of the CKM matrix. In addition, a new measured
value of RKµ3/Ke3 = 0.656±0.003(stat)±0.001(syst) is compared to the semi-empirical predictions
based on the latest form factor measurements.
Date Issued
2007-03-13
Date Acceptance
2007-02-06
Citation
European Physical Journal C, 2007, 50 (2), pp.329-340
ISSN
1434-6052
Publisher
Springer Verlag (Germany): SCOAP3
Start Page
329
End Page
340
Journal / Book Title
European Physical Journal C
Volume
50
Issue
2
Copyright Statement
The final publication is available at Springer via https://dx.doi.org/10.1140/epjc/s10052-007-0253-3
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
PHYSICS, PARTICLES & FIELDS
RADIATIVE-CORRECTIONS
MONTE-CARLO
PHOTOS
Publication Status
Published