Study of the decay $K^+\to\pi^+\nu \bar\nu$ in the momentum region $140 < P_\pi < 199$ MeV/c - INSPIRE

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Study of the decay $K^+\to\pi^+\nu \bar\nu$ in the momentum region $140 < P_\pi < 199$ MeV/c

BNL-E949

Collaboration

•

A.V. Artamonov
(
- Serpukhov, IHEP
)

Mar, 2009

28 pages

Published in:

Phys.Rev.D 79 (2009) 092004

Published: May 21, 2009

e-Print:

0903.0030 [hep-ex]

DOI:

10.1103/PhysRevD.79.092004

Report number:

BNL-81786-2008-JA,
FERMILAB-PUB-09-007-CD-T,
KEK-2008-44,
TRIUMF-TRI-PP-08-26,
UHEP-EX-08-004

Experiments:

BNL-E-0949

View in:

reference search535 citations

Citations per year

Abstract: (arXiv)

Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+ => pi+,nu,nubar in the pion momentum region 140 < P_pi < 199 MeV/c in an exposure of 1.71e12 stopped kaons with an estimated total background of 0.93+-0.17(stat.)+0.32-0.24(syst.) events. This brings the total number of observed K+ => pi+,nu,nubar events to seven. Combining this observation with previous results, assuming the pion spectrum predicted by the standard model, results in a branching ratio of (1.73+1.15-1.05)e-10. An interpretation of the results for alternative models of the decay K^ => pi+,nothing is also presented.

14.80.-j
13.20.Eb
K+: semileptonic decay
at rest
decay: model
K+: branching ratio
Brookhaven PS
neutral current: flavor changing
background
pi+: momentum spectrum

References(49)

Figures(10)

New Measurement of the $K^{+} \to \pi^{+} \nu \bar{\nu}$ Branching Ratio

E949

Collaboration

•

A.V. Artamonov
(
- Serpukhov, IHEP
)

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Measurement of the $K^+ \to \pi^+ \nu \bar{\nu}$ Branching Ratio

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Da-Xin Zhang
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Improved estimates of rare K decay matrix-elements from Kl3 decays

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