Evidence for D0-D0bar Mixing

B Aubert, Pablo Del Amo Sanchez, Matthew Barrett, Theresa Harrison, Alistair Hart, Christopher Hawkes, Alan Watson

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271 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)211802
Number of pages1
JournalPhysical Review Letters
Early online date1 May 2007
Publication statusPublished - 1 May 2007


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