Search for D0 D¯ 0 Mixing in Semileptonic Decay Modes

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, I. Costa, L. M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, P. Gagnon, S. Gerzon, C. GobelK. Gounder, A. 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, K. O’Shaughnessy, A. Nguyen, A. B. d’Oliveira, 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, K. Sugano, D. J. Summers, S. Takach, K. Thorne, A. K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, R. Yoshida, R. Zaliznyak, C. Zhang, E. M. Aitala

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Abstract

We report the result of a search for D0 D¯ 0 mixing in the data from hadroproduction experiment E791 at Fermilab. We use the charge of the pion from the strong decay D*+ → D0π+(and charge conjugate) to identify the charm quantum number of the neutral D at production, and the charge of the lepton and the kaon in the semileptonic decays D0 → Kev and Kμv to identify the charm at the time of decay. No evidence of mixing is seen. We set a 90% confidence level upper limit on mixing of r<0.50%, where r = γ(D0 D¯ 0 → K+l vl)/γ(D0 → K+l vl).

Original languageEnglish
Pages (from-to)2384-2387
Number of pages4
JournalPhysical Review Letters
Volume77
Issue number12
DOIs
StatePublished - 1996

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