# Observation of $B^0_s \to K^+K^-$ and Measurements of Branching Fractions of Charmless Two-body Decays of $B^0$ and $B_s$ Mesons in $p\bar{p}$ Collisions at $\sqrt{s}$=1.96 TeV

Abstract : We search for decays of the type B0(Bs)->h+h'- (where h,h'= K or pi) in 180 pb-1 of p-pbar collisions collected by the CDF II detector at the Fermilab Tevatron. We report the first observation of the new mode Bs->K+K- with a yield of 236 +- 32 events, corresponding to (f_s/f_d)*BR(Bs->K+K-)/BR(B0->K+pi-) = 0.46+-0.08(stat.)+-0.07(syst.), where f_s/f_d is the ratio of production fractions of Bs and B0. We find results in agreement with world averages for the B0 modes, and set the following new limits at 90% CL: BR(Bs->K-pi+) < 5.6*10^{-6} and BR(Bs->pi+pi-) < 1.7*10^{-6}.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00119454
Contributor : Dominique Girod <>
Submitted on : Sunday, December 31, 2006 - 3:11:18 PM
Last modification on : Saturday, December 12, 2020 - 3:16:00 AM

### Citation

A. Abulencia, D. Acosta, J. Adelman, T. Affolder, T. Akimoto, et al.. Observation of $B^0_s \to K^+K^-$ and Measurements of Branching Fractions of Charmless Two-body Decays of $B^0$ and $B_s$ Mesons in $p\bar{p}$ Collisions at $\sqrt{s}$=1.96 TeV. Physical Review Letters, American Physical Society, 2006, 97, pp.211802. ⟨10.1103/PhysRevLett.97.211802⟩. ⟨in2p3-00119454⟩

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