Abstract
A low-background sample of 10 300 events has been collected for the decay mode K+ → π+e+e- by experiment E865 at the Brookhaven Alternating Gradient Synchrotron. The branching ratio is measured to be [2.94±0.05(stat)±0.13(syst)±0.05(model)]×10-7, the vector nature of this decay is firmly established, and the decay form factor f(z)=f0(1+δz)(z = M2ee/m2K) is determined to have δ = 2.14±0.13±0.15. The experiment is described and results discussed in the context of chiral perturbation theory.
Original language | English |
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Pages (from-to) | 4482-4485 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 83 |
Issue number | 22 |
DOIs | |
State | Published - 1999 |