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. RI de Groot, Nicolo/A-2675-2009; Patrignani, Claudia/C-5223-2009; Lista, Luca/C-5719-2008; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Neri, Nicola/G-3991-2012; Sarti, Alessio/I-2833-2012; Monge, Maria Roberta/G-9127-2012
Improved measurement of CP asymmetries in B-0 ->(c(c)over-bar)K0((*)) decays
ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2005-01-01
Abstract
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. RI de Groot, Nicolo/A-2675-2009; Patrignani, Claudia/C-5223-2009; Lista, Luca/C-5719-2008; Bellini, Fabio/D-1055-2009; crosetti, nanni/H-3040-2011; Roe, Natalie/A-8798-2012; Neri, Nicola/G-3991-2012; Sarti, Alessio/I-2833-2012; Monge, Maria Roberta/G-9127-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
