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 Bs0→π +π - decay, with a significance of 3.7σ, and a measured branching ratio B(Bs0→π +π -)=(0.57±0.15(stat) ±0.10(syst))×10 -6. A search for the B0→K +K - mode in the same sample yields a significance of 2.0σ, and a central value estimate B(B0→K +K -)=(0.23±0.10(stat)±0.10(syst))×10 -6. © 2012 American Physical Society.

Evidence for the charmless annihilation decay mode Bs0→π +π -

Sforza F.;
2012-01-01

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 Bs0→π +π - decay, with a significance of 3.7σ, and a measured branching ratio B(Bs0→π +π -)=(0.57±0.15(stat) ±0.10(syst))×10 -6. A search for the B0→K +K - mode in the same sample yields a significance of 2.0σ, and a central value estimate B(B0→K +K -)=(0.23±0.10(stat)±0.10(syst))×10 -6. © 2012 American Physical Society.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/970542
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