The form factors of the decay K+ → π0e+ν (K(e3)/+) have been measured with stopped kaons. A Dalitz plot containing 4.1 x 104 events was analyzed. A comparison of the observed Dalitz plot with a Monte Carlo simulation determined the ratio of the strengths of possible scalar and tensor couplings to that of the vector coupling, f(S)/f+(0) = -0.002 ± 0.026(stat) ± 0.014(syst) and f(T)/f+(0) = -0.01 ± 0.14(stat) ± 0.09(syst). These values are consistent with the standard model prediction of zero, and disagree with a previous experiment. The analysis also yielded the coefficient of the q2 term in the vector form factor to be λ+ = 0.0278 ± 0.0026(stat) ± 0.0030(syst). (C) 2000 Elsevier Science B.V.
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2000 Dec 7|
Bibliographical noteFunding Information:
This work was supported in Japan by a Grant-in-Aid from the Ministry of Education, Science, Sports and Culture, and by JSPS; in Russia by the Ministry of Science and Technology, and by the Russian Foundation for Basic Research; in Canada by NSERC and IPP, and by the TRIUMF infrastructure support provided under its NRC contribution; in Korea by BSRI-MOE and KOSEF; in the USA by NSF and DOE; and in Taiwan by NSC. The authors gratefully acknowledge the excellent support received from the KEK staff.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics