# Improved Measurements of Branching Fractions for $B^0 \to \pi^+\pi^-, K^+\pi^-$, and Search for $K^+K^-$ at BaBar

Abstract : We present preliminary measurements of branching fractions for the charmless two-body decays B0 -> pi+pi- and K+pi-, and a search for B0 -> K+K- using a data sample of approximately 227 million BBbar decays. Signal yields are extracted with a multi-dimensional maximum likelihood fit, and the efficiency is corrected for the effects of final-state radiation. We find the charge-averaged branching fractions (in units of 10^{-6}): Br(B0 -> pi+pi-) = 5.5 +- 0.4 +- 0.3, Br(B0 -> K+pi-) = 19.2 +- 0.6 +- 0.6, Br(B0 -> K+K-) = < 0.40. The errors are statistical followed by systematic, and the upper limit on K+K- represents a confidence level of 90%.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00025578
Contributor : Sabine Starita <>
Submitted on : Tuesday, February 7, 2006 - 4:31:42 PM
Last modification on : Sunday, June 20, 2021 - 3:34:38 AM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. Improved Measurements of Branching Fractions for $B^0 \to \pi^+\pi^-, K^+\pi^-$, and Search for $K^+K^-$ at BaBar. EPS International Europhysics Conference on High Energy Physics (HEP-EPS 2005), Jul 2005, Lisbon, Portugal. pp.1-15. ⟨in2p3-00025578⟩

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