Improved measurement of the K+--pi+nunu; branching ratio

Authors :: V V, Anisimovsky
A V, Artamonov
B, Bassalleck
B, Bhuyan
E W, Blackmore
D A, Bryman
S, Chen
I-H, Chiang
I-A, Christidi
P S, Cooper
M V, Diwan
J S, Frank
T, Fujiwara
J, Hu
A P, Ivashkin
D E, Jaffe
S, Kabe
S H, Kettell
M M, Khabibullin
A N, Khotjantsev
P, Kitching
M, Kobayashi
T K, Komatsubara
A, Konaka
A P, Kozhevnikov
Yu G, Kudenko
A, Kushnirenko
L G, Landsberg
B, Lewis
K K, Li
L S, Littenberg
J A, Macdonald
J, Mildenberger
O V, Mineev
M, Miyajima
K, Mizouchi
V A, Mukhin
N, Muramatsu
T, Nakano
M, Nomachi
T, Nomura
T, Numao
V F, Obraztsov
K, Omata
D I, Patalakha
S V, Petrenko
R, Poutissou
E J, Ramberg
G, Redlinger
T, Sato
T, Sekiguchi
T, Shinkawa
R C, Strand
S, Sugimoto
Y, Tamagawa
R, Tschirhart
T, Tsunemi
D V, Vavilov
B, Viren
N V, Yershov
Y, Yoshimura
T, Yoshioka
Source :: Physical review letters. 93(3)
Publication Year :: 2004
Abstract: An additional event near the upper kinematic limit for K+--pi(+)nunu; has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+--pi(+)nunu;)=(1.47(+1.30)(-0.89))x10(-10) based on three events observed in the pion momentum region 211P229 MeV/c. At the measured central value of the branching ratio, the additional event had a signal-to-background ratio of 0.9.

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