A measurement of sin(2 beta) from B -> J/Psi K_s with the CDF detector

por Jorge Fernandez de Troconiz (Univ. Autonoma de Madrid)

martes 22 jun. 1999 12:00 → 13:00 Europe/Madrid

Sala Seminarios (Dpto. de Fisica Teorica (UVEG))

We report un updated direct measurement of the Standard Model CP violation parameter sin(2 beta) using the CDF detector at Fermilab. The signal sample consists of ~400 J/Psi K_s events. A maximum-likelihood fitting method is used to measure sin(2 beta)=0.79 +0.41 -0.44 (stat+syst). We calculate a 93% Feldman-Cousins confidence interval of 0 < sin(2 beta) < 1. This measurement is the best indication for CP violation in the neutral B meson system to date.