Search for D0−D0 mixing and doubly-Cabibbo-suppressed decays of the D0 in hadronic final states

E. M. Aitala, S. Amato, J. C. Anjos, J. A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S. B. Bracker, P. R. Burchat, R. A. Burnstein, T. Carter, H. S. Carvalho, N. K. Copty, L. M. Cremaldi, C. Darling, A. Fernandez, P. Gagnon, C. Gobel, K. GounderA. M. Halling, G. Herrera, G. Hurvits, C. James, P. A. Kasper, S. Kwan, D. C. Langs, J. Leslie, B. Lundberg, S. MayTal-Beck, B. Meadows, J. R.T. de Mello Neto, R. H. Milburn, J. M. de Miranda, A. Napier, A. Nguyen, A. B. d’Oliveira, K. O’Shaughnessy, K. C. Peng, L. P. Perera, M. V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N. W. Reay, J. J. Reidy, A. C. dos Reis, H. A. Rubin, A. K.S. Santha, A. F.S. Santoro, A. J. Schwartz, M. Sheaff, R. A. Sidwell, A. J. Slaughter, M. D. Sokoloff, N. R. Stanton, K. Stenson, D. J. Summers, S. Takach, K. Thorne, A. K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, S. Yoshida, R. Zaliznyak, C. Zhang

Research output: Contribution to journalArticlepeer-review


We present results of a search for (Formula presented) mixing and doubly-Cabibbo-suppressed decays of the (Formula presented) in Fermilab experiment E791, a fixed-target charm hadroproduction experiment. We look for evidence of mixing in the decay chain (Formula presented) or (Formula presented). If the charge of the pion from the (Formula presented) decay is the same as the charge of the kaon from the (Formula presented) decay (a “wrong-sign” event), mixing may have occurred. Mixing can be distinguished from other sources of wrong-sign events (such as doubly-Cabibbo-suppressed decays) by analyzing the distribution of decay times. We see no evidence of mixing. Allowing for (Formula presented) violation in the interference between DCS and mixing amplitudes our fitted ratio for mixed to unmixed decay rates is (Formula presented). This corresponds to a 90% C.L. upper limit of (Formula presented). The sensitivity of this result is comparable to that of previous measurements, but the assumptions made in fitting the data are notably more general. We present results from many fits to our data under various assumptions. If we assume (Formula presented), we find a two-sigma wrong-sign enhancement in the (Formula presented) mode which we ascribe to doubly Cabibbo-suppressed decays. The ratios of doubly Cabibbo-suppressed decays to Cabibbo-favored decays are (Formula presented) and (Formula presented).

Original languageEnglish
Pages (from-to)13-27
Number of pages15
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
StatePublished - Jan 1998
Externally publishedYes


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