%0 Journal Article
%T New, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio
%A A. Sher
%A R. Appel
%A G. S. Atoyan
%A B. Bassalleck
%A D. R. Bergman
%A N. Cheung
%A S. Dhawan
%A H. Do
%A J. Egger
%A S. Eilerts
%A H. Fischer
%A W. Herold
%A V. V. Issakov
%A H. Kaspar
%A D. E. Kraus
%A D. M. Lazarus
%A P. Lichard
%A J. Lowe
%A J. Lozano
%A H. Ma
%A W. Majid
%A S. Pislak
%A A. A. Poblaguev
%A P. Rehak
%A Aleksey Sher
%A J. A. Thompson
%A P. Truol
%A M. E. Zeller
%J Statistics
%D 2003
%I arXiv
%R 10.1103/PhysRevLett.91.261802
%X E865 at the Brookhaven National Laboratory AGS collected about 70,000 K+(e3) events with the purpose of measuring the relative K+(e3) branching ratio. The pi0 in all the decays was detected using the e+e- pair from pi0 -> e+e-gamma decay and no photons were required. Using the Particle Data Group branching ratios for the normalization decays we obtain BR(K+(e3(gamma))=(5.13+/-0.02(stat)+/-0.09(sys)+/-0.04(norm))%, where $K+(e3(gamma)) includes the effect of virtual and real photons. This result is 2.3 sigma higher than the current Particle Data Group value. The implications of this result for the $V_{us}$ element of the CKM matrix, and the matrix's unitarity are discussed.
%U http://arxiv.org/abs/hep-ex/0305042v3