Measurement of the Ratio of Branching Fractions Bs -> Ds π / Bd -> D+ π

This is the WEB page summarizing the blessed result for the measurement of the ratio of branching fractions for Bs mesons relative to B0 mesons. The measurement is done on the 355 pb-1 data set and have been blessed in the B Physics Meeting on Thursday October 13, 2005.  It superseeds the analysis performed on the 115 pb-1 (previous analysis)

BR(Bs → Ds π ) / BR(B0 → D+ π-) = 1.02 ± 0.07 ± 0.03 ± 0.15(BR) ± 0.15(PR)
fs/fd × BR(Bs → Ds π ) / BR(B0 → D+ π-) = 0.263 ± 0.017 ± 0.008 ± 0.039(BR)

There is a complete version of the results: ps.

This analysis is prepared by CDF in anticipation of the new precise measurements of BR(Ds → phi π) by CleoC collaboration and the new measurement of fs/fd at CDF. Those errors are clearly dominating the systematic error of the current measurement.

The following values of Branching fractions are used in this analysis:
BR(Ds → phi π) = 4.81 ± 0.64 % (BaBar)
BR(D+ → K π π) = 9.2 ± 0.6 % (PDG)
BR(phi → K K ) = 49.2 ± 0.6 % (PDG)
fs/fd = 0.259 ± 0.038 (PDG)

Below the eps versions of all figures meant for downloads.

    Yields:

        Fig.   1        Bd -> D+ pi Mass
        Fig.   2        Bs  -> Ds pi Mass

    CDF two track trigger

       Fig.   3        Trigger sketch

    Monte Carlo background study

       Fig.  4        Bd continuum physics background
       Fig.  5        Bs continuum physics background
         Fig.  6        Bs continuum background decomposed

    Fitting templates

       Fig. 7        Bd signal template
       Fig. 8        Bd -> D* pi, D+ rho partially reconstructed decays template    
       Fig. 9        Bd continuum background template              
       Fig. 10      Bd -> D K Cabibbo template
         Fig. 11      Lb as Bd template
         Fig. 12      Bs as Bd template
    
       Fig. 13       Bs signal template
        Fig. 14       Bs -> Ds* pi, Ds rho partially reconstructed decays template    
        Fig. 15       Bs continuum background template              
        Fig. 16       Bs -> Ds K Cabibbo template
        Fig. 17       Lb as Bs template
        Fig. 18       Bd as Bs template


A. Bolshov
Last modified: Fri Oct 14 18:48:24 CDT 2005