Measurement of the Ratios of Branching Fractions
نویسنده
چکیده
We present the measurement of the ratios of branching fractions B(B ° -+ D-r + ) to B(Bo -+ D--+), and B(B2 -+ OD-rr+rr ) to B(Bo -D-urx+r+-r-). We analyze data taken with the CDF II detector that corresponds to an integrated luminosity of 355 pb 1 in pp collisions at V = 1.96 TeV at the Fermilab Tevatron. Using a novel displaced track trigger we reconstruct 494 ± 28 B ° -+ D;-r+ decays, 8098 + 114 BO -4 D-r + decays, 159 + 17 B ° -+ D;-rr+7+rrdecays, and 3288 ± 76 Bo D-rr++T77rdecays. Using the world average value of the B°-to-Bo production ratio fs/fd = 0.259 ± 0.038, we determine the ratios of branching fractions B(Bo -+ D-r + ) -= 1.13 ± 0.08(stat.) ± 0.05(syst.) + 0.15(BR) ± 0.17(PR), B(Bo -+ D-rr+) B(Bo -+ D -rr+ r+rx-) ( = 1.01 ± 0.11(stat.) ± 0.06(syst.) ± 0.14(BR) + 0.15(PR), B(Bo -+ D-7r-+ r+ ri-) where the uncertainties labeled BR and PR refer to the uncertainty on the D meson branching fractions and the production ratio fs fd, respectively. Thesis Supervisor: Christoph M. E. Paus Title: Professor
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