We present updated measurements of the CP-violating parameters S-pi pi and C-pi pi in B-0->pi(+)pi(-) decays. Using a sample of 227x10(6) Upsilon(4S) -> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC, we observe 467 +/- 33 signal decays and measure S-pi pi = -0.30 +/- 0.17(stat) +/- 0.03(syst) and C-pi pi = -0.09 +/- 0.15(stat) +/- 0.04(syst). RI Peters, Klaus/C-2728-2008; 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; Monge, Maria Roberta/G-9127-2012; Sarti, Alessio/I-2833-2012
Improved measurements of CP-violating asymmetry amplitudes in B-0 ->pi(+)pi(-) decays
ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2005-01-01
Abstract
We present updated measurements of the CP-violating parameters S-pi pi and C-pi pi in B-0->pi(+)pi(-) decays. Using a sample of 227x10(6) Upsilon(4S) -> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC, we observe 467 +/- 33 signal decays and measure S-pi pi = -0.30 +/- 0.17(stat) +/- 0.03(syst) and C-pi pi = -0.09 +/- 0.15(stat) +/- 0.04(syst). RI Peters, Klaus/C-2728-2008; 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; Monge, Maria Roberta/G-9127-2012; Sarti, Alessio/I-2833-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
