First Observation of B̅ s0→Ds±K∓ and Measurement of the Ratio of Branching Fractions B(B̅ s0→Ds±K∓)/B(B̅ s0→Ds+π-)
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Aaltonen, Timo Antero; Akimoto, Takashi; Albrow, Michael G.; Álvarez González, Bárbara; Amerio, Silvia; Amidei, Dante; Anastassov, Anton; Annovi, Alberto; Antos, Jaroslav; Apollinari, Giorgio; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, Gervasio; Rodrigo Anoro, Teresa


Date
2009-11-03Derechos
© 2009 The American Physical Society
Publicado en
Physical Review Letters, vol 103, iss. 19, art. num. 191802 (2009)
Publisher
American Physical Society
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Abstract:
A combined mass and particle identification fit is used to make the first observation of the decay B̅ s0→Ds±K∓ and measure the branching fraction of B̅ s0→Ds±K∓ relative to B̅ s0→Ds+π-. This analysis uses 1.2 fb-1 integrated luminosity of pp̅ collisions at √s=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B̅ s0→Ds±K∓ signal with a statistical significance of 8.1σ and measure B(B̅ s0→Ds±K∓)/B(B̅ s0→Ds+π-)=0.097±0.018(stat)±0.009(syst).
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