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 6 fb(-1) of integrated luminosity, we obtain the first evidence for the B-s(0) -> pi(+)pi(-) decay, with a significance of 3.7 sigma, and a measured branching ratio B(B-s(0) -> pi(+)pi(-)) = (0.57 +/- 0.15(stat) +/- 0.10(syst)) x 10(-6). A search for the B-0 -> K+K- mode in the same sample yields a significance of 2.0 sigma, and a central value estimate B(B-0 -> K+K-) = (0.23 +/- 0.10(stat) +/- 0.10(syst)) x 10(-6).

T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2012). Evidence for the Charmless Annihilation Decay Mode B-s(0) -> pi(+)pi(-). PHYSICAL REVIEW LETTERS, 108(21) [10.1103/PhysRevLett.108.211803].

Evidence for the Charmless Annihilation Decay Mode B-s(0) -> pi(+)pi(-)

BARRIA, PATRIZIA;GAROSI, PAOLA;MAESTRO, PAOLO;RUFFINI, FABRIZIO;SCRIBANO, ANGELO;SQUILLACIOTI, PAOLA;
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 6 fb(-1) of integrated luminosity, we obtain the first evidence for the B-s(0) -> pi(+)pi(-) decay, with a significance of 3.7 sigma, and a measured branching ratio B(B-s(0) -> pi(+)pi(-)) = (0.57 +/- 0.15(stat) +/- 0.10(syst)) x 10(-6). A search for the B-0 -> K+K- mode in the same sample yields a significance of 2.0 sigma, and a central value estimate B(B-0 -> K+K-) = (0.23 +/- 0.10(stat) +/- 0.10(syst)) x 10(-6).
T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2012). Evidence for the Charmless Annihilation Decay Mode B-s(0) -> pi(+)pi(-). PHYSICAL REVIEW LETTERS, 108(21) [10.1103/PhysRevLett.108.211803].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/26141
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