We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227x10(6) Upsilon(4S)-> B (B) over bar decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CPasymmetry, sin2 beta in the standard model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B-0 or <<(B)over bar>(0) from its decay products. We measure sin2 beta=0.722 +/- 0.040(stat)+/- 0.023(syst) in agreement with the standard model expectation.
|Titolo:||Improved measurement of CP asymmetries in B-0 ->(c(c)over-bar)K0((*)) decays RID A-8798-2012 RID C-5223-2009 RID C-5719-2008 RID D-1055-2009 RID A-2675-2009|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevLett.94.161803|
|Appare nelle tipologie:||1.1 Articolo in rivista|