Observation and polarization measurement of B0→a1(1260)+a1(1260)− decay

We present measurements of the branching fraction B and longitudinal polarization fraction f L for B 0 → a 1 ( 1260 ) + a 1 ( 1260 ) − decays, with a 1 ( 1260 ) ± → π − π + π ± . The data sample, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represents 465 × 10 6 pro...

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Veröffentlicht in:	Physical review. D 2009-11, Vol.80
Hauptverfasser:	Aubert, B., Karyotakis, Y., Lees, J.P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Battaglia, M., Brown, D.N., Kerth, L.T., Kolomensky, Yu. G., Lynch, G., Osipenkov, I.L., Tackmann, K., Tanabe, T., Hawkes, C.M., Soni, N., Watson, A.T., Koch, H., Schroeder, T., Asgeirsson, D.J., Fulsom, B.G., Hearty, C., Mattison, T.S., Mckenna, J.A., Barrett, M., Khan, A., Randle-Conde, A., Blinov, V.E., Bukin, A.D., Buzykaev, A.R., Druzhinin, V.P., Golubev, V.B., Onuchin, A.P., Serednyakov, S.I., Skovpen, Yu. I., Solodov, E.P., Todyshev, K. Yu, Bondioli, M., Curry, S., Eschrich, I., Kirkby, D., Lankford, A.J., Lund, P., Mandelkern, M., Martin, E.C., Stoker, D.P., Atmacan, H., Gary, J.W., Liu, F., Long, O., Vitug, G.M., Yasin, Z., Sharma, V., Campagnari, C., Hong, T.M., Kovalskyi, D., Mazur, M.A., Richman, J.D., Beck, T.W., Eisner, A.M., Heusch, C.A., Kroseberg, J., Lockman, W.S., Martinez, A.J., Schalk, T., Schumm, B.A., Seiden, A., Wang, L., Winstrom, L.O., Cheng, C.H., Doll, D.A., Echenard, B., Fang, F., Hitlin, D.G., Narsky, I., Ongmongkolkul, P., Piatenko, T., Porter, F.C., Andreassen, R., Mancinelli, G., Meadows, B.T., Mishra, K., Sokoloff, M.D., Bloom, P.C., Ford, W.T., Gaz, A., Hirschauer, J.F., Nagel, M., Nauenberg, U., Smith, J.G., Wagner, S.R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Experiments Física de partícules High Energy Physics - Experiment Particle physics Physics
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Zusammenfassung:	We present measurements of the branching fraction B and longitudinal polarization fraction f L for B 0 → a 1 ( 1260 ) + a 1 ( 1260 ) − decays, with a 1 ( 1260 ) ± → π − π + π ± . The data sample, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represents 465 × 10 6 produced B ¯¯¯ B pairs. We measure B ( B 0 → a 1 ( 1260 ) + a 1 ( 1260 ) − ) × [ B ( a 1 ( 1260 ) + → π − π + π + ) ] 2 = ( 11.8 ± 2.6 ± 1.6 ) × 10 − 6 and f L = 0.31 ± 0.22 ± 0.10 , where the first uncertainty is statistical and the second systematic. The decay mode is measured with a significance of 5.0 standard deviations including systematic uncertainties.
ISSN:	1550-7998 2470-0010 2470-0029
DOI:	10.1103/PhysRevD.80.092007