Branching fractions and CP asymmetries in B0-->pi0pi0, B+-->pi+pi0, and B+-->K+pi0 decays and isospin analysis of the B-->pipi system

Based on a sample of 227 x 10(6) BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0-->pi(0)pi(0))=(1.17+/-0.32+/-0.10)x10(-6), and the asymmetry Cpi(0)(pi(0))=-0.12+/-0.56+/-0.06. The B0-->pi(0)pi(0) signal has a s...

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Published in:Physical review letters 2005-05, Vol.94 (18), p.181802-181802
Main Authors: Aubert, B, Barate, R, Boutigny, D, Couderc, F, Karyotakis, Y, Lees, J P, Poireau, V, Tisserand, V, Zghiche, A, Grauges-Pous, E, Palano, A, Pompili, A, Chen, J C, Qi, N D, Rong, G, Wang, P, Zhu, Y S, Eigen, G, Ofte, I, Stugu, B, Abrams, G S, Borgland, A W, Breon, A B, Brown, D N, Button-Shafer, J, Cahn, R N, Charles, E, Day, C T, Gill, M S, Gritsan, A V, Groysman, Y, Jacobsen, R G, Kadel, R W, Kadyk, J, Kerth, L T, Kolomensky, Yu G, Kukartsev, G, Lynch, G, Mir, L M, Oddone, P J, Orimoto, T J, Pripstein, M, Roe, N A, Ronan, M T, Wenzel, W A, Barrett, M, Ford, K E, Harrison, T J, Hart, A J, Hawkes, C M, Morgan, S E, Watson, A T, Fritsch, M, Goetzen, K, Held, T, Koch, H, Lewandowski, B, Pelizaeus, M, Schroeder, T, Steinke, M, Boyd, J T, Chevalier, N, Cottingham, W N, Kelly, M P, Latham, T E, Wilson, F F, Cuhadar-Donszelmann, T, Hearty, C, Knecht, N S, Mattison, T S, McKenna, J A, Thiessen, D, Khan, A, Kyberd, P, Teodorescu, L, Blinov, A E, Blinov, V E, Druzhinin, V P, Golubev, V B, Ivanchenko, V N, Kravchenko, E A, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Yushkov, A N, Best, D, Bruinsma, M, Chao, M, Eschrich, I, Kirkby, D, Lankford, A J, Mandelkern, M, Mommsen, R K, Roethel, W, Stoker, D P, Buchanan, C, Hartfiel, B L, Weinstein, A J R, Foulkes, S D
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Summary:Based on a sample of 227 x 10(6) BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0-->pi(0)pi(0))=(1.17+/-0.32+/-0.10)x10(-6), and the asymmetry Cpi(0)(pi(0))=-0.12+/-0.56+/-0.06. The B0-->pi(0)pi(0) signal has a significance of 5.0 sigma. We also measure B(B+-->pi(+)pi(0))=(5.8+/-0.6+/-0.4)x10(-6), B(B+-->K+pi(0))=(12.0+/-0.7+/-0.6)x10(-6), and the charge asymmetries Api(+)(pi(0))=-0.01+/-0.10+/-0.02 and AK+(pi(0))=0.06+/-0.06+/-0.01. Using isospin relations, we find an upper bound on the angle difference |alpha-alpha(eff)| of 35 degrees at the 90% C.L.
ISSN:0031-9007