Measurement of the absolute branching fraction of D+ › K¯ 0e +?e via K¯ 0 › ? 0? 0 *

Abstract

By analyzing 2.93 fb-1 data collected at the center-of-mass energy ? s = 3.773 GeV with the BESIII detector, we measure the absolute branching fraction of the semileptonic decay D + › K¯ 0 e +?e to be B(D+ › K¯ 0 e +?e) = (8.59 ± 0.14 ± 0.21)% using K¯ 0 › K 0 S › ? 0? 0 , where the first uncertainty is statistical and the second systematic. Our result is consistent with previous measurements within uncertainties.