Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-
(2007) Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-. PHYSICAL REVIEW D, 75 (1). -. ISSN 1550-7998 Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevD.75.012008
We present measurements of the branching fractions for the charmless two-body decays B-0 ->pi(+)pi(-) and B-0 -> K+pi(-), and a search for the decay B-0 -> K+K-. We include the effects of final-state radiation from the daughter mesons for the first time, and quote branching fractions for the inclusive processes B-0 -> h(+)h('-)n gamma, where h and h(') are pions or kaons. The maximum value of the sum of the energies of the n undetected photons, E-gamma(max), is mode-dependent. Using a data sample of approximately 227x10(6) Upsilon(4S)-> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC, we measure: B(B-0 ->pi(+)pi(-)n gamma;E-gamma(max)=150 MeV)=(5.1 +/- 0.4 +/- 0.2)x10(-6), B(B-0 -> K+pi(-)n gamma;E-gamma(max)=105 MeV)=(18.1 +/- 0.6 +/- 0.6)x10(-6), B(B-0 -> K(+)K(-)n gamma;E-gamma(max)=59 MeV)< 0.5x10(-6)(90% confidence level), where the first uncertainty is statistical and the second is systematic. Theoretical calculations can be used to extrapolate from the above measurements the nonradiative branching fractions, B-0. Using one such calculation, we find: B-0(B-0 ->pi(+)pi(-))=(5.5 +/- 0.4 +/- 0.3)x10(-6), B-0(B-0 -> K+pi(-))=(19.1 +/- 0.6 +/- 0.6)x10(-6), B-0(B-0 -> K+K-)< 0.5x10(-6)(90% confidence level). Meaningful comparison between theory and experiment, as well as combination of measurements from different experiments, can be performed only in terms of these nonradiative quantities.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy
Q Science > QC Physics
|Journal or Publication Title:||PHYSICAL REVIEW D|
|Publisher:||AMERICAN PHYSICAL SOC|
|Official Date:||January 2007|
|Number of Pages:||9|
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