We study the decay B(0)-> D(*+)D(*-)K(S)(0) using (230 +/- 2)x10(6)B (B) over bar pairs collected by the BABAR detector at the PEP-II B factory. We measure a branching fraction B(B(0)-> D(*+)D(*-)K(S)(0))=(4.4 +/- 0.4 +/- 0.7)x10(-3) and find evidence for the decay B(0)-> D(*-)D(s1)(+)(2536) with a significance of 4.6 sigma. A time-dependent CP asymmetry analysis is also performed to study the possible resonant contributions to B(0)-> D(*+)D(*-)K(S)(0) and the sign of cos2 beta. Our measurement indicates that there is a sizable resonant contribution to the decay B(0)-> D(*+)D(*-)K(S)(0) 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(*-)K(S)(0) RID C-2728-2008 RID C-5223-2009 RID C-5719-2008 RID D-1055-2009 RID A-2675-2009
ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2006-01-01
Abstract
We study the decay B(0)-> D(*+)D(*-)K(S)(0) using (230 +/- 2)x10(6)B (B) over bar pairs collected by the BABAR detector at the PEP-II B factory. We measure a branching fraction B(B(0)-> D(*+)D(*-)K(S)(0))=(4.4 +/- 0.4 +/- 0.7)x10(-3) and find evidence for the decay B(0)-> D(*-)D(s1)(+)(2536) with a significance of 4.6 sigma. A time-dependent CP asymmetry analysis is also performed to study the possible resonant contributions to B(0)-> D(*+)D(*-)K(S)(0) and the sign of cos2 beta. Our measurement indicates that there is a sizable resonant contribution to the decay B(0)-> D(*+)D(*-)K(S)(0) from an unknown D(s1)(+) state with large width, and that cos2 beta is positive at the 94% confidence level under certain theoretical assumptions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
