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|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics