Improved Measurement of the CKM Angle $\alpha$ Using $\B^0\bar{B}\to\rho^+\rho^-$ Decays

Improved Measurement of the CKM Angle $\alpha$ Using $\B^0\bar{B}\to\rho^+\rho^-$ Decays

We present results from an analysis of B0 -> rho+rho- using 232 million Upsilon(4S) decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We measure the longitudinal polarization fraction f_L = 0.978 +- 0.014 (stat) +0.021 -0.029 (syst) and the CP-violating...

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Veröffentlicht in:Physical review letters 2005, Vol.95
Hauptverfasser: 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., Peters, K., Schroeder, T., Steinke, M., Boyd, J.T., Burke, J.P., 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.
Format: Artikel
Sprache:eng
Schlagworte:
High Energy Physics - Experiment
Physics
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Zusammenfassung:We present results from an analysis of B0 -> rho+rho- using 232 million Upsilon(4S) decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We measure the longitudinal polarization fraction f_L = 0.978 +- 0.014 (stat) +0.021 -0.029 (syst) and the CP-violating parameters SLong = -0.33 +- 0.24 (stat) +0.08 -0.14 (syst) and CLong = -0.03 +- 0.18 (stat) +- 0.09 (syst). Using an isospin analysis of B -> rho rho decays we determine the unitarity triangle alpha. The solution compatible with the Standard Model is alpha = (100 +- 13) degrees.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.041805