Observation of the decay B± → π±π0, study of B± → K±π0, and search for B0 → π0 π0

Bernard Aubert,R. Barate, D. Boutigny, J.M. Gaillard,A. Hicheur,Y. Karyotakis, J. P. Lees,Patrick Robbe,V. Tisserand,A. Zghiche,A. Palano,Alexis Pompili, J. C. Chen,N. D. Qi,G. Rong, Pu Wang,Y. S. Zhu,G. Eigen,I. Ofte,B. Stugu, G. S. Abrams,A. W. Borgland, A. B. Breon,D. N. Brown, J. Button-Shafer,Robert N. Cahn,E. Charles,M. S. Gill,Andrei Gritsan,Y. Groysman, R. G. Jacobsen, R. W. Kadel,J. A. Kadyk, L. T. Kerth,Y. G. Kolomensky,J. F. Kral, G. Kukartsev,C. LeClerc,M. E. Levi, G. Lynch,Lluisa-Maria Mir,P. J. Oddone,Toyoko Orimoto, M. Pripstein,Natalie A. Roe, A. Romosan, Michael T Ronan, V.G. Shelkov, A. V. Telnov, W.A. Wenzel,T. J. Harrison,C. M. Hawkes, D. J. Knowles,R. C. Penny,A. T. Watson,N. K. Watson, T. Deppermann, K. Goetzen, Herbert Koch, B. Lewandowski, M. Pelizaeus,K. Peters, H. Schmuecker,M. Steinke,N. R. Barlow,Wahid Bhimji,J. T. Boyd, N. Chevalier,Philip James Clark,W. N. Cottingham,Catherine Kirsty Mackay,Fergus Wilson,C. Hearty,T. S. Mattison,J. A. McKenna, D. Thiessen,Paul Kyberd, A. K. McKemey,V. E. Blinov,A. D. Bukin,V. B. Golubev,V. N. Ivanchenko,E. A. Kravchenko,A. P. Onuchin,S. I. Serednyakov,Yu I. Skovpen,E. P. Solodov,A. N. Yushkov,D. S. Best,M. Chao,D. Kirkby,A. J. Lankford,M. Mandelkern,S. McMahon,R. K. Mommsen,W. Roethel, D. P. Stoker, C. D. Buchanan,H. K. Hadavand,E. J. Hill

Physical Review Letters（2003）

引用 11|浏览145

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摘要

We present results for the branching fractions and charge asymmetries in B+/--->h(+/-)pi(0) (where h(+/-)=pi(+/-),K+/-) and a search for the decay B0-->pi(0)pi(0) using a sample of approximately 88 x 10(6) BBmacr; pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure B(B+/--->pi(+/-)pi(0))=(5.5(+1.0)(-0.9)+/-0.6)x10(-6), where the first error is statistical and the second is systematic. The B+/--->pi(+/-)pi(0) signal has a significance of 7.7sigma including systematic uncertainties. We simultaneously measure the K+/-pi(0) branching fraction to be B(B+/--->K+/-pi(0))=(12.8(+1.2)(-1.1)+/-1.0)x10(-6). The charge asymmetries are Api(+/-)(pi(0))=-0.03(+0.18)(-0.17)+/-0.02 and AK+/-(pi(0))=-0.09+/-0.09+/-0.01. We place a 90% confidence-level upper limit on the branching fraction B(B0-->pi(0)pi(0)) of 3.6 x 10(-6).

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