New measurement of the decay branching ratio and hadronic form factors
详细信息 查看全文
- 作者：NA48/2 Collaboration ; J.R. Batley ; G. Kalmus ; C. Lazzeroni ; D.J. Munday ; M.W. Slater ; S.A. Wotton ; R. Arcidiacono ; G. Bocquet ; N. Cabibbo ; A. Ceccucci ; D. Cundy ; V. Falaleev ; M. Fidecaro ; L. Gatignon ; A. Gonidec ; W. Kubischta ; A. Norton ; A. Maier ; M. Patel ; et al.
- 关键词：Kaon rare decays ; Branching ratio ; Hadronic form factors ; Semileptonic Ke4 decay
- 刊名：Physics Letters B
- 出版年：2012
- 出版时间：29 August, 2012
- 年：2012
- 卷：715
- 期：1-3
- 页码：105-115
- 全文大小：554 K
文摘
A sample of more than one million () 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 decays, is measured to be with a total relative error of . 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 ¦Ð¦Ð scattering lengths conducted on the same data sample. The overall form factor normalization is obtained with a total relative precision of .