# Measurement of the Ratio of Branching Fractions $\cal{B}(D^0 \to K^+ \pi^-)/\cal{B}(D^0 \to K^- pi^+)$ using the CDF II Detector

Abstract : We present a measurement of R_B, the ratio of the branching fraction for the rare decay D0 -> K+ pi- to that for the Cabibbo-favored decay D0 -> K- pi+. Charge conjugate decays are implicitly included. A signal of 2005 +/- 104 events for the decay D0 -> K+ pi- is obtained using the CDF II detector at the Fermilab Tevatron collider. The data set corresponds to an integrated luminosity of 0.35 1/fb produced in p-bar/p collisions at sqrt{s}=1.96 TeV. Assuming no mixing, we find R_B = [ 4.05 +/- 0.21 (stat) +/- 0.11 (syst) ] x 10(-3). This measurement is consistent with the world average, and comparable in accuracy with the best measurements from other experiments.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00103779
Contributor : Dominique Girod <>
Submitted on : Sunday, December 31, 2006 - 2:59:51 PM
Last modification on : Wednesday, May 27, 2020 - 7:20:03 PM

### Citation

A. Abulencia, D. Acosta, J. Adelman, T. Affolder, T. Akimoto, et al.. Measurement of the Ratio of Branching Fractions $\cal{B}(D^0 \to K^+ \pi^-)/\cal{B}(D^0 \to K^- pi^+)$ using the CDF II Detector. Physical Review D, American Physical Society, 2006, 74, pp.031109. ⟨10.1103/PhysRevD.74.031109⟩. ⟨in2p3-00103779⟩

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