Journal article

Evidence for D-0-(D)over-bar(0) mixing

B Aubert, M Bona, D Boutigny, Y Karyotakis, JP Lees, V Poireau, X Prudent, V Tisserand, A Zghiche, J Garra Tico, E Grauges, L Lopez, A Palano, G Eigen, B Stugu, L Sun, GS Abrams, M Battaglia, DN Brown, J Button-Shafer Show all

PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2007

Abstract

We present evidence for D0-D(0) mixing in D(0)-->K(+)pi(-) decays from 384 fb(-1) of e(+)e(-) colliding-beam data recorded near square root s=10.6 GeV with the BABAR detector at the PEP-II storage rings at the Stanford Linear Accelerator Center. We find the mixing parameters x('2)=[-0.22+/-0.30(stat)+/-0.21(syst)] x 10(-3) and y(')=[9.7+/-4.4(stat)+/-3.1(syst)] x 10(-3) and a correlation between them of -0.95. This result is inconsistent with the no-mixing hypothesis with a significance of 3.9 standard deviations. We measure R(D), the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates, to be [0.303+/-0.016(stat)+/-0.010(syst)]%. We find no evidence for CP violation.