A Measurement of the KL Charge Asymmetry

Abstract

We present a measurement of the charge asymmetry ${\delta }_L$ in the mode $K_L\to {\pi }^{\pm }{e}^{\mp }\nu$ based on 298 million analyzed decays. We measure a value of ${\delta }_L=(3322\pm 58(stat)\pm 47(sys))\cdot 10^{-6}$, in good agreement with previous measurements and 2.4 times more precise than the current best published result. The result is used to place more stringent limits on CPT and $\Delta S=\Delta Q$ violation in the neutral kaon system.

Submitted to Physical Review Letters, Dec 31, 2001. 4 pages, 4 figures