New measurement of the charged kaon semileptonic $K^\pm \to \pi^+\pi^- e^\pm\nu$ ($K_e4$) decay Branching Ratio and Hadronic Form Factors - INSPIRE

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New measurement of the charged kaon semileptonic $K^\pm \to \pi^+\pi^- e^\pm\nu$ ( $K_e4$ ) decay Branching Ratio and Hadronic Form Factors

NA48/2

Collaboration

•

J.R. Batley
(
- Cambridge U.
)

Jun, 2012

21 pages

Published in:

Phys.Lett.B 715 (2012) 105-115,
Phys.Lett.B 740 (2015) 364-364 (addendum)

Published: Aug 29, 2012

e-Print:

1206.7065 [hep-ex]

DOI:

10.1016/j.physletb.2012.07.048,
10.1016/j.physletb.2014.12.020 (addendum)

PDG:

{{\mathit K}^{+}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Report number:

CERN-PH-EP-2012-185

Experiments:

CERN-NA-048-2

View in:

reference search47 citations

Citations per year

Abstract: (Elsevier)

A sample of more than one million K±→π+π−e±ν ( Ke4 ) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003–2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of Ke4γ decays, is measured to be BR(Ke4)=(4.257±0.016exp±0.031ext)×10−5 with a total relative error of 0.8% . This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the ππ scattering lengths conducted on the same data sample. The overall form factor normalization fs=5.705±0.017exp±0.031ext is obtained with a total relative precision of 0.6% .

Note:

21 pages, 5 figures, 5 tables, submitted to Phys. Lett. B

Kaon rare decays
Branching ratio
Hadronic form factors
Semileptonic K e 4 decay
Semileptonic Ke4 decay
Semileptonic [formula omitted] decay
form factor: hadronic
K+: branching ratio
CERN SPS
NA48

References(19)

Figures(11)

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