Study of D0-D̄0 mixing and D0 doubly Cabibbo-suppressed decays

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, E. Merle, M. N. Minard, J. Y. Nief, B. Pietrzyk, R. Alemany, G. Boix, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, L. GarridoE. Grauges, A. Juste, M. Martinez, G. Merino, R. Miquel, L. M. Mir, I. C. Park, A. Pascual, I. Riu, F. Sanchez, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, P. Bright-Thomas, D. Casper, M. Cattaneo, F. Cerutti, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, A. W. Halley, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, H. Wachsmuth, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil

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Abstract

Using a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D*+ → D0π+s, with D0 decaying to K- π+ or to K+ π-, are studied. The relative branching ratio B(D0 → K+ π-)/B(D0 → K- π+) is measured to be (1.84±0.59(stat.) ±0.34(syst.))%. The two possible contributions to the D0 → K+ π- decay, doubly Cabibbo-suppressed decays and D0-D̄0 mixing, are disentangled by measuring the proper-time distribution of the reconstructed D0,s. Assuming no interference between the two processes, the upper limit obtained on the mixing rate is 0.92% at 95% CL. The possible effect of interference between the two amplitudes is also assessed. © 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)211-221
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume436
Issue number1-2
DOIs
Publication statusPublished - 17 Sep 1998

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