Improved measurement of the Cabibbo-Kobayashi-Maskawa angle α using B0(B)→p+p- decays

Improved measurement of the Cabibbo-Kobayashi-Maskawa angle α using B0(B)→p+p- decays

We present results from an analysis of B0(B¯¯¯0)→ρ+ρ− using 232×106 Υ(4S)→BB¯¯¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction fL=0.978±0.014(stat)+0.021−0.029(syst) and the CP-violating parameters SL=−0.3...

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Hauptverfasser: Ahmed, M, Azzolini, V, Band, H. R, Bard, D. J, Barlow, N. R, Berryhill, J. W, Bhimji, W, Bona, Marcella, Brandenburg, G, Briand, H, Brose, J, Brown, C. M, Bruinsma, M, Brunet, S, Bugg, W, Buzzo, A, Cahn, R. N, Capra, R, Charles, E, Chen, Anping, Chen, C, Chen, E, Chevalier, N, Cote, D, Covarelli, R, D'Orazio, A, Dahmes, B, Dauncey, Paul D, De Groot, N, Del Buono, L, Druzhinin, V. P, Eckhart, E. A, Edwards, A. J, Egede, Ulrik, Ferrarotto, F, Flack, R. L, Ford, K. E, Galeazzi, F, Gladney, L, Golubev, V. B, Gowdy, S. J, Hamano, K, Hertzbach, Stanley S, Hollar, J. J, Honscheid, K, Hufnagel, D, Kagan, H, Klose, V, Koeneke, K, Kovalskyi, D, Kowalewski, Robert V, Lees, J. P, Luppi, E, Lusiani, A, Lutz, A. M, MacFarlane, D. B, Macri, M, Mandelkern, M, Mazzoni, M. A, Messner, R, Mohapatra, A. K, O'Grady, C. P, Palombo, F, Pelizaeus, M, Peruzzi, I. M, Petersen, B. A, Polci, F, Posocco, M, Potter, C. T, Rahatlou, Sh, Raven, G, Richman, J. D, Ritchie, J. L, Rizzo, G, Ronan, M. T, Rotondo, M, Ruddick, W. O, Salvatore, F, Schroeder, T, Schune, M. H, Schwierz, R, Skovpen, Yu. I, Smith, James G, Snyder, A, Steinke, M, Stoker, D. P, Stroili, R, Thompson, J. M, Ulmer, K. A, Uwer, U, Vuagnin, G, Wagner, S. R, Waldi, R, Weaver, M, Won, E, Wormser, G, Wright, D. M, Yushkov, A. N, Zghiche, A, BaBar Collaboration
Format: Artikel
Sprache:eng
Schlagworte:
Annihilation
CKM matrix
Colliding beams
Electron positron
Electroproduction
Hadronic decay
Isospin
Pair production
Upsilon
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Zusammenfassung:We present results from an analysis of B0(B¯¯¯0)→ρ+ρ− using 232×106 Υ(4S)→BB¯¯¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction fL=0.978±0.014(stat)+0.021−0.029(syst) and the CP-violating parameters SL=−0.33±0.24(stat)+0.08−0.14(syst) and CL=−0.03±0.18(stat)±0.09(syst). Using an isospin analysis of B→ρρ decays, we determine the unitarity triangle parameter α. The solution compatible with the standard model is α=(100±13)°.