Improved measurements of the branching fractions for B{sup 0}{yields}{pi}{sup +}{pi}{sup -} and B{sup 0}{yields}K{sup +}{pi}{sup -}, and a search for B{sup 0}{yields}K{sup +}K{sup -}
- Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
- Universitat de Barcelona, Facultat de Fisica Dept. ECM, E-08028 Barcelona (Spain)
- Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
- Institute of High Energy Physics, Beijing 100039 (China)
- University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
We present measurements of the branching fractions for the charmless two-body decays B{sup 0}{yields}{pi}{sup +}{pi}{sup -} and B{sup 0}{yields}K{sup +}{pi}{sup -}, and a search for the decay B{sup 0}{yields}K{sup +}K{sup -}. 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{sup 0}{yields}h{sup +}h{sup '-}n{gamma}, where h and h{sup '} are pions or kaons. The maximum value of the sum of the energies of the n undetected photons, E{sub {gamma}}{sup max}, is mode-dependent. Using a data sample of approximately 227x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC, we measure: B(B{sup 0}{yields}{pi}{sup +}{pi}{sup -}n{gamma};E{sub {gamma}}{sup max}=150 MeV)=(5.1{+-}0.4{+-}0.2)x10{sup -6}, B(B{sup 0}{yields}K{sup +}{pi}{sup -}n{gamma};E{sub {gamma}}{sup max}=105 MeV)=(18.1{+-}0.6{+-}0.6)x10{sup -6}, B(B{sup 0}{yields}K{sup +}K{sup -}n{gamma};E{sub {gamma}}{sup max}=59 MeV)<0.5x10{sup -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{sup 0}. Using one such calculation, we find: B{sup 0}(B{sup 0}{yields}{pi}{sup +}{pi}{sup -})=(5.5{+-}0.4{+-}0.3)x10{sup -6}, B{sup 0}(B{sup 0}{yields}K{sup +}{pi}{sup -})=(19.1{+-}0.6{+-}0.6)x10{sup -6}, B{sup 0}(B{sup 0}{yields}K{sup +}K{sup -})<0.5x10{sup -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.
- OSTI ID:
- 20933201
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 1; Other Information: DOI: 10.1103/PhysRevD.75.012008; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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