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Title: 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 -}

Abstract

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, asmore » well as combination of measurements from different experiments, can be performed only in terms of these nonradiative quantities.« less

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2];  [3]; ; ; ; ;  [4]; ; ;  [5]
  1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
  2. Universitat de Barcelona, Facultat de Fisica Dept. ECM, E-08028 Barcelona (Spain)
  3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
  4. Institute of High Energy Physics, Beijing 100039 (China)
  5. University of Bergen, Institute of Physics, N-5007 Bergen (Norway) (and others)
Publication Date:
OSTI Identifier:
20933201
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.012008; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B NEUTRAL MESONS; BRANCHING RATIO; KAONS MINUS; KAONS PLUS; MEV RANGE 10-100; MEV RANGE 100-1000; PAIR PRODUCTION; PARTICLE DECAY; PHOTONS; PIONS MINUS; PIONS PLUS; STANFORD LINEAR ACCELERATOR CENTER; TWO-BODY PROBLEM

Citation Formats

Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., and Stugu, B. 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 -}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.012008.
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., & Stugu, B. 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 -}. United States. doi:10.1103/PHYSREVD.75.012008.
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., and Stugu, B. Mon . "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 -}". United States. doi:10.1103/PHYSREVD.75.012008.
@article{osti_20933201,
title = {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 -}},
author = {Aubert, B. and Barate, R. and Bona, M. and Boutigny, D. and Couderc, F. and Karyotakis, Y. and Lees, J. P. and Poireau, V. and Tisserand, V. and Zghiche, A. and Grauges, E. and Palano, A. and Chen, J. C. and Qi, N. D. and Rong, G. and Wang, P. and Zhu, Y. S. and Eigen, G. and Ofte, I. and Stugu, B.},
abstractNote = {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.},
doi = {10.1103/PHYSREVD.75.012008},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}