We report a direct measurement of D0-D0 mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D(0) K(S)(0) pi+ pi- and, for the first time, D0 K(S)(0)K+ K- decays. The low-momentum pion pi(s)(+) in the decay D*+ D0 pi(s)(+) identifies the flavor of the neutral D meson at its production. Using 468.5 fb(-1) of e+ e- colliding-beam data recorded near square root(s)=10.6 GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x = [1.6 2.3(stat) 1.2(syst) 0.8(model)] * 10(-3), and y = [5.7 2.0(stat) 1.3(syst) 0.7(model)] * 10(-3). These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.
Measurement of D0-D0 mixing parameters using D0 K(S)(0)pi+ pi- and D0 K(S)(0)K+ K- decays.
PALANO, Antimo;
2010-01-01
Abstract
We report a direct measurement of D0-D0 mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D(0) K(S)(0) pi+ pi- and, for the first time, D0 K(S)(0)K+ K- decays. The low-momentum pion pi(s)(+) in the decay D*+ D0 pi(s)(+) identifies the flavor of the neutral D meson at its production. Using 468.5 fb(-1) of e+ e- colliding-beam data recorded near square root(s)=10.6 GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x = [1.6 2.3(stat) 1.2(syst) 0.8(model)] * 10(-3), and y = [5.7 2.0(stat) 1.3(syst) 0.7(model)] * 10(-3). These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
