Measurement of the doubly Cabibbo suppressed decay D 0 → K + π − and a search for charm mixing

نویسندگان

  • J. C. Anjos
  • A. A. Machado
  • I. M. Pepe
  • A. Sánchez-Hernández
  • J. P. Cumalat
  • K. Stenson
  • H. W. K. Cheung
  • G. Chiodini
  • P. H. Garbincius
  • L. A. Garren
  • A. E. Kreymer
  • M. Bertani
  • F. L. Fabbri
  • J. W. Kwak
  • K. B. Lee
  • D. Pedrini
  • M. Rovere
  • G. Liguori
  • S. P. Ratti
  • J. E. Ramirez
  • E. W. Vaandering
چکیده

We present an analysis of the decayD0→K+π− based on FOCUS data. From a sample of 234 signal events, we find a branching ratio of Γ(D →Kπ) Γ(D0→K−π+) = (0.429 − 0.061 ± 0.027)% under the assumptions of no mixing and no CP violation. Allowing for CP violation, we find a branching ratio of (0.435 0.063 − 0.061 ± 0.028)% and a CP asymmetry of 0.178 0.144 − 0.141 ± 0.041. The branching ratio for the case of mixing with no CP violation is (0.381 0.167 − 0.163 ± 0.092)%. We also present limits on charm mixing.

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تاریخ انتشار 2004