New measurement of the K+-->pi+ nunu branching ratio

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; J Ives; 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; Zhe Wang; N V Yershov; Y Yoshimura; T Yoshioka; E949 Collaboration

doi:10.1103/PhysRevLett.101.191802

New measurement of the K+-->pi+ nunu branching ratio

Phys Rev Lett. 2008 Nov 7;101(19):191802. doi: 10.1103/PhysRevLett.101.191802. Epub 2008 Nov 7.

Authors

A V Artamonov¹, 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, J Ives, 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, Zhe Wang, N V Yershov, Y Yoshimura, T Yoshioka; E949 Collaboration

Affiliation

¹ Institute for High Energy Physics, Protvino, Moscow Region, 142 280, Russia.

PMID: 19113260
DOI: 10.1103/PhysRevLett.101.191802

Abstract

Three events for the decay K+-->pi+ nunu have been observed in the pion momentum region below the K+-->pi+pi0 peak, 140 < Ppi < 199 MeV/c, with an estimated background of 0.93+/-0.17(stat.) -0.24+0.32(syst.) events. Combining this observation with previously reported results yields a branching ratio of B(K+-->pi+ nunu) = (1.73(-1.05)+1.15) x 10(-10) consistent with the standard model prediction.