We search for annihilation decay modes of neutral b mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6fb^{-1} of integrated luminosity, we obtain the first evidence for the B_{s}^{0}pi^{+}pi^{-} decay, with a significance of 3.7sigma, and a measured branching ratio B(B_{s}^{0}pi^{+}pi^{-})=(0.570.15(stat)0.10(syst))*10^{-6}. A search for the B^{0}K^{+}K^{-} mode in the same sample yields a significance of 2.0sigma, and a central value estimate B(B^{0}K^{+}K^{-})=(0.230.10(stat)0.10(syst))*10^{-6}.
Evidence for the Charmless Annihilation Decay Mode B_s^0pi^+pi^-.
BISELLO, DARIO;BUSETTO, GIOVANNI;LUCCHESI, DONATELLA;
2012
Abstract
We search for annihilation decay modes of neutral b mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6fb^{-1} of integrated luminosity, we obtain the first evidence for the B_{s}^{0}pi^{+}pi^{-} decay, with a significance of 3.7sigma, and a measured branching ratio B(B_{s}^{0}pi^{+}pi^{-})=(0.570.15(stat)0.10(syst))*10^{-6}. A search for the B^{0}K^{+}K^{-} mode in the same sample yields a significance of 2.0sigma, and a central value estimate B(B^{0}K^{+}K^{-})=(0.230.10(stat)0.10(syst))*10^{-6}.File in questo prodotto:
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