Improved measurement of the K+→π+ν(ν)over-bar branching ratio -: art. no. 031801

被引：129

作者：

Anisimovsky, VV

Artamonov, AV

Bassalleck, B

Bhuyan, B

Blackmore, EW

Bryman, DA

Chen, S

Chiang, IH

Christidi, IA

Cooper, PS

Diwan, MV

Frank, JS

Fujiwara, T

Hu, J

Ivashkin, AP

Jaffe, DE

Kabe, S

Kettell, SH

Khabibullin, MM

Khotjantsev, AN

Kitching, P

Kobayashi, M

Komatsubara, TK

Konaka, A

Kozhevnikov, AP

Kudenko, YG

Kushnirenko, A

Landsberg, LG

Lewis, B

Li, KK

Littenberg, LS

Macdonald, JA

Mildenberger, J

Mineev, OV

Miyajima, M

Mizouchi, K

Mukhin, VA

Muramatsu, N

Nakano, T

Nomachi, M

Nomura, T

Numao, T

Obraztsov, VF

Omata, K

Patalakha, DI

Petrenko, SV

Poutissou, R

Ramberg, EJ

Redlinger, G

Sato, T

机构：

[1] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[2] Inst High Energy Phys, Protvino 142280, Moscow Region, Russia

[3] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[4] Brookhaven Natl Lab, Upton, NY 11973 USA

[5] TRIUMF, Vancouver, BC V6T 2A3, Canada

[6] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[7] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[8] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[9] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

[10] High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[11] Univ Alberta, Ctr Subatom Res, Edmonton, AB T6G 2N5, Canada

[12] Univ Fukui, Dept Appl Phys, Fukui 9108507, Japan

[13] Osaka Univ, Res Ctr Nucl Phys, Osaka 5670047, Japan

[14] Osaka Univ, Nucl Studies Lab, Osaka 5600043, Japan

[15] Natl Def Acad, Dept Appl Phys, Kanagawa 2398686, Japan

[16] Univ Delhi, Dept Phys, Delhi 1100007, India

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.93.031801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An additional event near the upper kinematic limit for K+-->pi(+)nu(nu) over bar has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+-->pi(+)nu(nu) over bar)=(1.47(-0.89)(+1.30))x10(-10) based on three events observed in the pion momentum region 211<P<229 MeV/c. At the measured central value of the branching ratio, the additional event had a signal-to-background ratio of 0.9.

引用

页码：031801 / 1

页数：4