We study the decay B0 ->(D*+D*-KS0) using (230 +/- 2)x10^6 B Bbar pairs collected by the BABAR detector at the PEP-II B factory. We measure a branching fraction B(B0 -> (D*+ D*- KS0))=(4.4 +/- 0.4 +/- 0.7)x10(-3) and find evidence for the decay B0 -> D*-Ds1+(2536) with a significance of 4.6 sigma. A time-dependent CP asymmetry analysis is also performed to study the possible resonant contributions to B0 -> (D*+ D*- KS0) and the sign of cos2 beta. Our measurement indicates that there is a sizable resonant contribution to the decay B0 -> (D*+ D*- KS0) from an unknown D-s1(+) state with large width, and that cos2 beta is positive at the 94% confidence level under certain theoretical assumptions.

Measurement of the branching fraction and time-dependent CP asymmetry in the decay B-0 ->(D*+D*-KS0) / B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, J.P. Lees, V. Poireau, V. Tisserand, A. Zghiche, E. Grauges, A. Palano, M. Pappagallo, A. Pompili, J.C. Chen, N.D. Qi, G. Rong, P. Wang, Y.S. Zhu, G. Eigen, I. Ofte, B. Stugu, G.S. Abrams, M. Battaglia, D.S. Best, D.N. Brown, J. Button Shafer, R.N. Cahn, E. Charles, C.T. Day, M.S. Gill, A.V. Gritsan, Y. Groysman, R.G. Jacobsen, R.W. Kadel, J.A. Kadyk, L.T. Kerth, Y.G. Kolomensky, G. Kukartsev, G. Lynch, L.M. Mir, P.J. Oddone, T.J. Orimoto, M. Pripstein, N.A. Roe, M.T. Ronan, W.A. Wenzel, M. Barrett, K.E. Ford, T.J. Harrison, A.J. Hart, C.M. Hawkes, S.E. Morgan, A.T. Watson, M. Fritsch, K. Goetzen, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, K. Peters, T. Schroeder, M. Steinke, J.T. Boyd, J.P. Burke, W.N. Cottingham, D. Walker, T. Cuhadar Donszelmann, B.G. Fulsom, C. Hearty, N.S. Knecht, T.S. Mattison, J.A. McKenna, A. 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Measurement of the branching fraction and time-dependent CP asymmetry in the decay B-0 ->(D*+D*-KS0)

A. Lazzaro;N. Neri;F. Palombo;V.P. Lombardo
2006

Abstract

We study the decay B0 ->(D*+D*-KS0) using (230 +/- 2)x10^6 B Bbar pairs collected by the BABAR detector at the PEP-II B factory. We measure a branching fraction B(B0 -> (D*+ D*- KS0))=(4.4 +/- 0.4 +/- 0.7)x10(-3) and find evidence for the decay B0 -> D*-Ds1+(2536) with a significance of 4.6 sigma. A time-dependent CP asymmetry analysis is also performed to study the possible resonant contributions to B0 -> (D*+ D*- KS0) and the sign of cos2 beta. Our measurement indicates that there is a sizable resonant contribution to the decay B0 -> (D*+ D*- KS0) from an unknown D-s1(+) state with large width, and that cos2 beta is positive at the 94% confidence level under certain theoretical assumptions.
mesons; quark
Settore FIS/01 - Fisica Sperimentale
2006
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/22440
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